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 * 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.
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
33 * @(#)if.c 8.3 (Berkeley) 1/4/94
34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
35 * $DragonFly: src/sys/net/if.c,v 1.33 2005/04/15 18:39:13 dillon Exp $
38 #include "opt_compat.h"
39 #include "opt_inet6.h"
42 #include <sys/param.h>
43 #include <sys/malloc.h>
45 #include <sys/systm.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/socketops.h>
51 #include <sys/protosw.h>
52 #include <sys/kernel.h>
53 #include <sys/sockio.h>
54 #include <sys/syslog.h>
55 #include <sys/sysctl.h>
56 #include <sys/domain.h>
59 #include <net/if_arp.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_var.h>
63 #include <net/ifq_var.h>
64 #include <net/radix.h>
65 #include <net/route.h>
66 #include <machine/stdarg.h>
68 #if defined(INET) || defined(INET6)
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/if_ether.h>
74 #include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
75 #include <netinet6/in6_var.h>
76 #include <netinet6/in6_ifattach.h>
80 #if defined(COMPAT_43)
81 #include <emulation/43bsd/43bsd_socket.h>
82 #endif /* COMPAT_43 */
85 * Support for non-ALTQ interfaces.
87 static int ifq_classic_enqueue(struct ifaltq *, struct mbuf *,
88 struct altq_pktattr *);
90 ifq_classic_dequeue(struct ifaltq *, int);
91 static int ifq_classic_request(struct ifaltq *, int, void *);
94 * System initialization
97 static void if_attachdomain(void *);
98 static void if_attachdomain1(struct ifnet *);
99 static int ifconf (u_long, caddr_t, struct thread *);
100 static void ifinit (void *);
101 static void if_slowtimo (void *);
102 static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
103 static int if_rtdel (struct radix_node *, void *);
105 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
107 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
108 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
109 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
111 int ifqmaxlen = IFQ_MAXLEN;
112 struct ifnethead ifnet; /* depend on static init XXX */
116 * XXX: declare here to avoid to include many inet6 related files..
117 * should be more generalized?
119 extern void nd6_setmtu (struct ifnet *);
122 struct if_clone *if_clone_lookup (const char *, int *);
123 int if_clone_list (struct if_clonereq *);
125 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
126 int if_cloners_count;
128 struct callout if_slowtimo_timer;
131 * Network interface utility routines.
133 * Routines with ifa_ifwith* names take sockaddr *'s as
143 callout_init(&if_slowtimo_timer);
146 TAILQ_FOREACH(ifp, &ifnet, if_link) {
147 if (ifp->if_snd.ifq_maxlen == 0) {
148 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
149 ifp->if_snd.ifq_maxlen = ifqmaxlen;
158 struct ifaddr **ifnet_addrs;
159 struct ifnet **ifindex2ifnet = NULL;
162 * Attach an interface to the
163 * list of "active" interfaces.
166 if_attach(struct ifnet *ifp)
168 unsigned socksize, ifasize;
169 int namelen, masklen;
170 struct sockaddr_dl *sdl;
174 static int if_indexlim = 8;
175 static boolean_t inited;
182 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
183 ifp->if_index = ++if_index;
186 * The old code would work if the interface passed a pre-existing
187 * chain of ifaddrs to this code. We don't trust our callers to
188 * properly initialize the tailq, however, so we no longer allow
189 * this unlikely case.
191 TAILQ_INIT(&ifp->if_addrhead);
192 TAILQ_INIT(&ifp->if_prefixhead);
193 LIST_INIT(&ifp->if_multiaddrs);
194 getmicrotime(&ifp->if_lastchange);
195 if (ifnet_addrs == NULL || if_index >= if_indexlim) {
200 n = if_indexlim * sizeof(struct ifaddr *);
201 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
202 if (ifnet_addrs != NULL) {
203 bcopy(ifnet_addrs, q, n/2);
204 free(ifnet_addrs, M_IFADDR);
206 ifnet_addrs = (struct ifaddr **)q;
208 /* grow ifindex2ifnet */
209 n = if_indexlim * sizeof(struct ifnet *);
210 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
212 bcopy(ifindex2ifnet, q, n/2);
213 free(ifindex2ifnet, M_IFADDR);
215 ifindex2ifnet = (struct ifnet **)q;
218 ifindex2ifnet[if_index] = ifp;
221 * create a Link Level name for this device
223 namelen = strlen(ifp->if_xname);
224 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
225 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
226 socksize = masklen + ifp->if_addrlen;
227 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
228 if (socksize < sizeof(*sdl))
229 socksize = sizeof(*sdl);
230 socksize = ROUNDUP(socksize);
231 ifasize = sizeof(struct ifaddr) + 2 * socksize;
232 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
233 sdl = (struct sockaddr_dl *)(ifa + 1);
234 sdl->sdl_len = socksize;
235 sdl->sdl_family = AF_LINK;
236 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
237 sdl->sdl_nlen = namelen;
238 sdl->sdl_index = ifp->if_index;
239 sdl->sdl_type = ifp->if_type;
240 ifnet_addrs[if_index - 1] = ifa;
242 ifa->ifa_rtrequest = link_rtrequest;
243 ifa->ifa_addr = (struct sockaddr *)sdl;
244 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
245 ifa->ifa_netmask = (struct sockaddr *)sdl;
246 sdl->sdl_len = masklen;
248 sdl->sdl_data[--namelen] = 0xff;
249 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
251 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
255 ifq->altq_disc = NULL;
256 ifq->altq_flags &= ALTQF_CANTCHANGE;
257 ifq->altq_tbr = NULL;
259 ifq_set_classic(ifq);
261 if (!SLIST_EMPTY(&domains))
262 if_attachdomain1(ifp);
264 /* Announce the interface. */
265 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
269 if_attachdomain(void *dummy)
275 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
276 if_attachdomain1(ifp);
279 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST,
280 if_attachdomain, NULL);
283 if_attachdomain1(struct ifnet *ifp)
290 /* address family dependent data region */
291 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
292 SLIST_FOREACH(dp, &domains, dom_next)
293 if (dp->dom_ifattach)
294 ifp->if_afdata[dp->dom_family] =
295 (*dp->dom_ifattach)(ifp);
300 * Detach an interface, removing it from the
301 * list of "active" interfaces.
304 if_detach(struct ifnet *ifp)
307 struct radix_node_head *rnh;
312 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
315 * Remove routes and flush queues.
320 if (ifq_is_enabled(&ifp->if_snd))
321 altq_disable(&ifp->if_snd);
322 if (ifq_is_attached(&ifp->if_snd))
323 altq_detach(&ifp->if_snd);
326 * Remove address from ifnet_addrs[] and maybe decrement if_index.
327 * Clean up all addresses.
329 ifnet_addrs[ifp->if_index - 1] = 0;
330 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
333 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
334 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
336 /* XXX: Ugly!! ad hoc just for INET */
337 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
338 struct ifaliasreq ifr;
340 bzero(&ifr, sizeof ifr);
341 ifr.ifra_addr = *ifa->ifa_addr;
342 if (ifa->ifa_dstaddr)
343 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
344 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
350 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
352 /* ifp_addrhead is already updated */
356 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
362 * Remove all IPv6 kernel structs related to ifp. This should be done
363 * before removing routing entries below, since IPv6 interface direct
364 * routes are expected to be removed by the IPv6-specific kernel API.
365 * Otherwise, the kernel will detect some inconsistency and bark it.
371 * Delete all remaining routes using this interface
372 * Unfortuneatly the only way to do this is to slog through
373 * the entire routing table looking for routes which point
374 * to this interface...oh well...
376 for (i = 1; i <= AF_MAX; i++) {
377 if ((rnh = rt_tables[i]) == NULL)
379 rnh->rnh_walktree(rnh, if_rtdel, ifp);
382 /* Announce that the interface is gone. */
383 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
385 SLIST_FOREACH(dp, &domains, dom_next)
386 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
387 (*dp->dom_ifdetach)(ifp,
388 ifp->if_afdata[dp->dom_family]);
390 ifindex2ifnet[ifp->if_index] = NULL;
392 TAILQ_REMOVE(&ifnet, ifp, if_link);
397 * Delete Routes for a Network Interface
399 * Called for each routing entry via the rnh->rnh_walktree() call above
400 * to delete all route entries referencing a detaching network interface.
403 * rn pointer to node in the routing table
404 * arg argument passed to rnh->rnh_walktree() - detaching interface
408 * errno failed - reason indicated
412 if_rtdel(struct radix_node *rn, void *arg)
414 struct rtentry *rt = (struct rtentry *)rn;
415 struct ifnet *ifp = arg;
418 if (rt->rt_ifp == ifp) {
421 * Protect (sorta) against walktree recursion problems
424 if (!(rt->rt_flags & RTF_UP))
427 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
428 rt_mask(rt), rt->rt_flags,
429 (struct rtentry **) NULL);
431 log(LOG_WARNING, "if_rtdel: error %d\n", err);
439 * Create a clone network interface.
442 if_clone_create(char *name, int len)
444 struct if_clone *ifc;
446 int wildcard, bytoff, bitoff;
450 ifc = if_clone_lookup(name, &unit);
454 if (ifunit(name) != NULL)
458 wildcard = (unit < 0);
460 * Find a free unit if none was given.
463 while (bytoff < ifc->ifc_bmlen &&
464 ifc->ifc_units[bytoff] == 0xff)
466 if (bytoff >= ifc->ifc_bmlen)
468 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
470 unit = (bytoff << 3) + bitoff;
473 if (unit > ifc->ifc_maxunit)
476 err = (*ifc->ifc_create)(ifc, unit);
482 bitoff = unit - (bytoff << 3);
486 * Allocate the unit in the bitmap.
488 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
489 ("%s: bit is already set", __func__));
490 ifc->ifc_units[bytoff] |= (1 << bitoff);
492 /* In the wildcard case, we need to update the name. */
494 for (dp = name; *dp != '\0'; dp++);
495 if (snprintf(dp, len - (dp-name), "%d", unit) >
496 len - (dp-name) - 1) {
498 * This can only be a programmer error and
499 * there's no straightforward way to recover if
502 panic("if_clone_create(): interface name too long");
507 EVENTHANDLER_INVOKE(if_clone_event, ifc);
513 * Destroy a clone network interface.
516 if_clone_destroy(const char *name)
518 struct if_clone *ifc;
523 ifc = if_clone_lookup(name, &unit);
527 if (unit < ifc->ifc_minifs)
534 if (ifc->ifc_destroy == NULL)
537 (*ifc->ifc_destroy)(ifp);
540 * Compute offset in the bitmap and deallocate the unit.
543 bitoff = unit - (bytoff << 3);
544 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
545 ("%s: bit is already cleared", __func__));
546 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
551 * Look up a network interface cloner.
554 if_clone_lookup(const char *name, int *unitp)
556 struct if_clone *ifc;
560 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
561 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
562 if (ifc->ifc_name[i] != *cp)
567 ifc = LIST_NEXT(ifc, ifc_list);
571 return ((struct if_clone *)NULL);
577 for (i = 0; *cp != '\0'; cp++) {
578 if (*cp < '0' || *cp > '9') {
579 /* Bogus unit number. */
582 i = (i * 10) + (*cp - '0');
592 * Register a network interface cloner.
595 if_clone_attach(struct if_clone *ifc)
602 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
603 ("%s: %s requested more units then allowed (%d > %d)",
604 __func__, ifc->ifc_name, ifc->ifc_minifs,
605 ifc->ifc_maxunit + 1));
607 * Compute bitmap size and allocate it.
609 maxclone = ifc->ifc_maxunit + 1;
611 if ((len << 3) < maxclone)
613 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
614 ifc->ifc_bmlen = len;
616 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
619 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
620 err = (*ifc->ifc_create)(ifc, unit);
622 ("%s: failed to create required interface %s%d",
623 __func__, ifc->ifc_name, unit));
625 /* Allocate the unit in the bitmap. */
627 bitoff = unit - (bytoff << 3);
628 ifc->ifc_units[bytoff] |= (1 << bitoff);
633 * Unregister a network interface cloner.
636 if_clone_detach(struct if_clone *ifc)
639 LIST_REMOVE(ifc, ifc_list);
640 free(ifc->ifc_units, M_CLONE);
645 * Provide list of interface cloners to userspace.
648 if_clone_list(struct if_clonereq *ifcr)
650 char outbuf[IFNAMSIZ], *dst;
651 struct if_clone *ifc;
652 int count, error = 0;
654 ifcr->ifcr_total = if_cloners_count;
655 if ((dst = ifcr->ifcr_buffer) == NULL) {
656 /* Just asking how many there are. */
660 if (ifcr->ifcr_count < 0)
663 count = (if_cloners_count < ifcr->ifcr_count) ?
664 if_cloners_count : ifcr->ifcr_count;
666 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
667 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
668 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
669 error = copyout(outbuf, dst, IFNAMSIZ);
678 * Locate an interface based on a complete address.
681 ifa_ifwithaddr(struct sockaddr *addr)
686 TAILQ_FOREACH(ifp, &ifnet, if_link)
687 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
688 if (ifa->ifa_addr->sa_family != addr->sa_family)
690 if (sa_equal(addr, ifa->ifa_addr))
692 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
693 /* IPv6 doesn't have broadcast */
694 ifa->ifa_broadaddr->sa_len != 0 &&
695 sa_equal(ifa->ifa_broadaddr, addr))
698 return ((struct ifaddr *)NULL);
701 * Locate the point to point interface with a given destination address.
704 ifa_ifwithdstaddr(struct sockaddr *addr)
709 TAILQ_FOREACH(ifp, &ifnet, if_link)
710 if (ifp->if_flags & IFF_POINTOPOINT)
711 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
712 if (ifa->ifa_addr->sa_family != addr->sa_family)
714 if (ifa->ifa_dstaddr &&
715 sa_equal(addr, ifa->ifa_dstaddr))
718 return ((struct ifaddr *)NULL);
722 * Find an interface on a specific network. If many, choice
723 * is most specific found.
726 ifa_ifwithnet(struct sockaddr *addr)
730 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
731 u_int af = addr->sa_family;
732 char *addr_data = addr->sa_data, *cplim;
735 * AF_LINK addresses can be looked up directly by their index number,
736 * so do that if we can.
739 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
741 if (sdl->sdl_index && sdl->sdl_index <= if_index)
742 return (ifnet_addrs[sdl->sdl_index - 1]);
746 * Scan though each interface, looking for ones that have
747 * addresses in this address family.
749 TAILQ_FOREACH(ifp, &ifnet, if_link) {
750 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
751 char *cp, *cp2, *cp3;
753 if (ifa->ifa_addr->sa_family != af)
755 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
757 * This is a bit broken as it doesn't
758 * take into account that the remote end may
759 * be a single node in the network we are
761 * The trouble is that we don't know the
762 * netmask for the remote end.
764 if (ifa->ifa_dstaddr != NULL &&
765 sa_equal(addr, ifa->ifa_dstaddr))
769 * if we have a special address handler,
770 * then use it instead of the generic one.
772 if (ifa->ifa_claim_addr) {
773 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
781 * Scan all the bits in the ifa's address.
782 * If a bit dissagrees with what we are
783 * looking for, mask it with the netmask
784 * to see if it really matters.
787 if (ifa->ifa_netmask == 0)
790 cp2 = ifa->ifa_addr->sa_data;
791 cp3 = ifa->ifa_netmask->sa_data;
792 cplim = ifa->ifa_netmask->sa_len +
793 (char *)ifa->ifa_netmask;
795 if ((*cp++ ^ *cp2++) & *cp3++)
796 goto next; /* next address! */
798 * If the netmask of what we just found
799 * is more specific than what we had before
800 * (if we had one) then remember the new one
801 * before continuing to search
802 * for an even better one.
804 if (ifa_maybe == 0 ||
805 rn_refines((char *)ifa->ifa_netmask,
806 (char *)ifa_maybe->ifa_netmask))
815 * Find an interface address specific to an interface best matching
819 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
822 char *cp, *cp2, *cp3;
824 struct ifaddr *ifa_maybe = 0;
825 u_int af = addr->sa_family;
829 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
830 if (ifa->ifa_addr->sa_family != af)
834 if (ifa->ifa_netmask == NULL) {
835 if (sa_equal(addr, ifa->ifa_addr) ||
836 (ifa->ifa_dstaddr != NULL &&
837 sa_equal(addr, ifa->ifa_dstaddr)))
841 if (ifp->if_flags & IFF_POINTOPOINT) {
842 if (sa_equal(addr, ifa->ifa_dstaddr))
846 cp2 = ifa->ifa_addr->sa_data;
847 cp3 = ifa->ifa_netmask->sa_data;
848 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
849 for (; cp3 < cplim; cp3++)
850 if ((*cp++ ^ *cp2++) & *cp3)
859 #include <net/route.h>
862 * Default action when installing a route with a Link Level gateway.
863 * Lookup an appropriate real ifa to point to.
864 * This should be moved to /sys/net/link.c eventually.
867 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
870 struct sockaddr *dst;
873 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL ||
874 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL)
876 ifa = ifaof_ifpforaddr(dst, ifp);
881 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
882 ifa->ifa_rtrequest(cmd, rt, info);
887 * Mark an interface down and notify protocols of
889 * NOTE: must be called at splnet or eqivalent.
892 if_unroute(struct ifnet *ifp, int flag, int fam)
896 ifp->if_flags &= ~flag;
897 getmicrotime(&ifp->if_lastchange);
898 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
899 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
900 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
901 ifq_purge(&ifp->if_snd);
906 * Mark an interface up and notify protocols of
908 * NOTE: must be called at splnet or eqivalent.
911 if_route(struct ifnet *ifp, int flag, int fam)
915 ifp->if_flags |= flag;
916 getmicrotime(&ifp->if_lastchange);
917 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
918 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
919 pfctlinput(PRC_IFUP, ifa->ifa_addr);
927 * Mark an interface down and notify protocols of the transition. An
928 * interface going down is also considered to be a synchronizing event.
929 * We must ensure that all packet processing related to the interface
930 * has completed before we return so e.g. the caller can free the ifnet
931 * structure that the mbufs may be referencing.
933 * NOTE: must be called at splnet or eqivalent.
936 if_down(struct ifnet *ifp)
939 if_unroute(ifp, IFF_UP, AF_UNSPEC);
940 netmsg_service_sync();
944 * Mark an interface up and notify protocols of
946 * NOTE: must be called at splnet or eqivalent.
949 if_up(struct ifnet *ifp)
952 if_route(ifp, IFF_UP, AF_UNSPEC);
956 * Handle interface watchdog timer routines. Called
957 * from softclock, we decrement timers (if set) and
958 * call the appropriate interface routine on expiration.
961 if_slowtimo(void *arg)
966 TAILQ_FOREACH(ifp, &ifnet, if_link) {
967 if (ifp->if_timer == 0 || --ifp->if_timer)
969 if (ifp->if_watchdog)
970 (*ifp->if_watchdog)(ifp);
973 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
977 * Map interface name to
978 * interface structure pointer.
981 ifunit(const char *name)
986 * Search all the interfaces for this name/number
989 TAILQ_FOREACH(ifp, &ifnet, if_link) {
990 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
998 * Map interface name in a sockaddr_dl to
999 * interface structure pointer.
1002 if_withname(struct sockaddr *sa)
1004 char ifname[IFNAMSIZ+1];
1005 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
1007 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
1008 (sdl->sdl_nlen > IFNAMSIZ) )
1012 * ifunit wants a null-terminated name. It may not be null-terminated
1013 * in the sockaddr. We don't want to change the caller's sockaddr,
1014 * and there might not be room to put the trailing null anyway, so we
1015 * make a local copy that we know we can null terminate safely.
1018 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
1019 ifname[sdl->sdl_nlen] = '\0';
1020 return ifunit(ifname);
1028 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
1036 size_t namelen, onamelen;
1037 char new_name[IFNAMSIZ];
1039 struct sockaddr_dl *sdl;
1045 return (ifconf(cmd, data, td));
1047 ifr = (struct ifreq *)data;
1052 if ((error = suser(td)) != 0)
1054 return ((cmd == SIOCIFCREATE) ?
1055 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1056 if_clone_destroy(ifr->ifr_name));
1058 case SIOCIFGCLONERS:
1059 return (if_clone_list((struct if_clonereq *)data));
1062 ifp = ifunit(ifr->ifr_name);
1068 ifr->ifr_flags = ifp->if_flags;
1069 ifr->ifr_flagshigh = ifp->if_flags >> 16;
1073 ifr->ifr_reqcap = ifp->if_capabilities;
1074 ifr->ifr_curcap = ifp->if_capenable;
1078 ifr->ifr_metric = ifp->if_metric;
1082 ifr->ifr_mtu = ifp->if_mtu;
1086 ifr->ifr_phys = ifp->if_physical;
1093 new_flags = (ifr->ifr_flags & 0xffff) |
1094 (ifr->ifr_flagshigh << 16);
1095 if (ifp->if_flags & IFF_SMART) {
1096 /* Smart drivers twiddle their own routes */
1097 } else if (ifp->if_flags & IFF_UP &&
1098 (new_flags & IFF_UP) == 0) {
1102 } else if (new_flags & IFF_UP &&
1103 (ifp->if_flags & IFF_UP) == 0) {
1108 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1109 (new_flags &~ IFF_CANTCHANGE);
1110 if (new_flags & IFF_PPROMISC) {
1111 /* Permanently promiscuous mode requested */
1112 ifp->if_flags |= IFF_PROMISC;
1113 } else if (ifp->if_pcount == 0) {
1114 ifp->if_flags &= ~IFF_PROMISC;
1117 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1118 getmicrotime(&ifp->if_lastchange);
1125 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1127 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1134 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1137 if (new_name[0] == '\0')
1139 if (ifunit(new_name) != NULL)
1142 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
1144 /* Announce the departure of the interface. */
1145 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1147 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1148 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1149 /* XXX IFA_LOCK(ifa); */
1150 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1151 namelen = strlen(new_name);
1152 onamelen = sdl->sdl_nlen;
1154 * Move the address if needed. This is safe because we
1155 * allocate space for a name of length IFNAMSIZ when we
1156 * create this in if_attach().
1158 if (namelen != onamelen) {
1159 bcopy(sdl->sdl_data + onamelen,
1160 sdl->sdl_data + namelen, sdl->sdl_alen);
1162 bcopy(new_name, sdl->sdl_data, namelen);
1163 sdl->sdl_nlen = namelen;
1164 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1165 bzero(sdl->sdl_data, onamelen);
1166 while (namelen != 0)
1167 sdl->sdl_data[--namelen] = 0xff;
1168 /* XXX IFA_UNLOCK(ifa) */
1170 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
1172 /* Announce the return of the interface. */
1173 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1180 ifp->if_metric = ifr->ifr_metric;
1181 getmicrotime(&ifp->if_lastchange);
1190 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1192 getmicrotime(&ifp->if_lastchange);
1197 u_long oldmtu = ifp->if_mtu;
1202 if (ifp->if_ioctl == NULL)
1203 return (EOPNOTSUPP);
1204 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1206 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1208 getmicrotime(&ifp->if_lastchange);
1212 * If the link MTU changed, do network layer specific procedure.
1214 if (ifp->if_mtu != oldmtu) {
1228 /* Don't allow group membership on non-multicast interfaces. */
1229 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1232 /* Don't let users screw up protocols' entries. */
1233 if (ifr->ifr_addr.sa_family != AF_LINK)
1236 if (cmd == SIOCADDMULTI) {
1237 struct ifmultiaddr *ifma;
1238 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1240 error = if_delmulti(ifp, &ifr->ifr_addr);
1243 getmicrotime(&ifp->if_lastchange);
1246 case SIOCSIFPHYADDR:
1247 case SIOCDIFPHYADDR:
1249 case SIOCSIFPHYADDR_IN6:
1251 case SIOCSLIFPHYADDR:
1253 case SIOCSIFGENERIC:
1257 if (ifp->if_ioctl == 0)
1258 return (EOPNOTSUPP);
1259 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1261 getmicrotime(&ifp->if_lastchange);
1265 ifs = (struct ifstat *)data;
1266 ifs->ascii[0] = '\0';
1268 case SIOCGIFPSRCADDR:
1269 case SIOCGIFPDSTADDR:
1270 case SIOCGLIFPHYADDR:
1272 case SIOCGIFGENERIC:
1273 if (ifp->if_ioctl == 0)
1274 return (EOPNOTSUPP);
1275 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
1281 return if_setlladdr(ifp,
1282 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1285 oif_flags = ifp->if_flags;
1286 if (so->so_proto == 0)
1287 return (EOPNOTSUPP);
1289 error = so_pru_control(so, cmd, data, ifp, td);
1296 case SIOCSIFDSTADDR:
1298 case SIOCSIFBRDADDR:
1299 case SIOCSIFNETMASK:
1300 #if BYTE_ORDER != BIG_ENDIAN
1301 if (ifr->ifr_addr.sa_family == 0 &&
1302 ifr->ifr_addr.sa_len < 16) {
1303 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1304 ifr->ifr_addr.sa_len = 16;
1307 if (ifr->ifr_addr.sa_len == 0)
1308 ifr->ifr_addr.sa_len = 16;
1316 case OSIOCGIFDSTADDR:
1317 cmd = SIOCGIFDSTADDR;
1320 case OSIOCGIFBRDADDR:
1321 cmd = SIOCGIFBRDADDR;
1324 case OSIOCGIFNETMASK:
1325 cmd = SIOCGIFNETMASK;
1327 error = so_pru_control(so, cmd, data, ifp, td);
1331 case OSIOCGIFDSTADDR:
1332 case OSIOCGIFBRDADDR:
1333 case OSIOCGIFNETMASK:
1334 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1338 #endif /* COMPAT_43 */
1340 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1342 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1343 if (ifp->if_flags & IFF_UP) {
1357 * Set/clear promiscuous mode on interface ifp based on the truth value
1358 * of pswitch. The calls are reference counted so that only the first
1359 * "on" request actually has an effect, as does the final "off" request.
1360 * Results are undefined if the "off" and "on" requests are not matched.
1363 ifpromisc(struct ifnet *ifp, int pswitch)
1369 oldflags = ifp->if_flags;
1370 if (ifp->if_flags & IFF_PPROMISC) {
1371 /* Do nothing if device is in permanently promiscuous mode */
1372 ifp->if_pcount += pswitch ? 1 : -1;
1377 * If the device is not configured up, we cannot put it in
1380 if ((ifp->if_flags & IFF_UP) == 0)
1382 if (ifp->if_pcount++ != 0)
1384 ifp->if_flags |= IFF_PROMISC;
1385 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1388 if (--ifp->if_pcount > 0)
1390 ifp->if_flags &= ~IFF_PROMISC;
1391 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1394 ifr.ifr_flags = ifp->if_flags;
1395 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1396 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1397 (struct ucred *)NULL);
1401 ifp->if_flags = oldflags;
1406 * Return interface configuration
1407 * of system. List may be used
1408 * in later ioctl's (above) to get
1409 * other information.
1412 ifconf(u_long cmd, caddr_t data, struct thread *td)
1414 struct ifconf *ifc = (struct ifconf *)data;
1417 struct sockaddr *sa;
1418 struct ifreq ifr, *ifrp;
1419 int space = ifc->ifc_len, error = 0;
1421 ifrp = ifc->ifc_req;
1422 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1425 if (space <= sizeof ifr)
1429 * Zero the stack declared structure first to prevent
1430 * memory disclosure.
1432 bzero(&ifr, sizeof(ifr));
1433 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1434 >= sizeof(ifr.ifr_name)) {
1435 error = ENAMETOOLONG;
1440 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1441 if (space <= sizeof ifr)
1444 if (td->td_proc->p_ucred->cr_prison &&
1449 if (cmd == OSIOCGIFCONF) {
1450 struct osockaddr *osa =
1451 (struct osockaddr *)&ifr.ifr_addr;
1453 osa->sa_family = sa->sa_family;
1454 error = copyout(&ifr, ifrp, sizeof ifr);
1458 if (sa->sa_len <= sizeof(*sa)) {
1460 error = copyout(&ifr, ifrp, sizeof ifr);
1463 if (space < (sizeof ifr) + sa->sa_len -
1466 space -= sa->sa_len - sizeof(*sa);
1467 error = copyout(&ifr, ifrp,
1468 sizeof ifr.ifr_name);
1470 error = copyout(sa, &ifrp->ifr_addr,
1472 ifrp = (struct ifreq *)
1473 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1477 space -= sizeof ifr;
1482 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1483 error = copyout(&ifr, ifrp, sizeof ifr);
1486 space -= sizeof ifr;
1490 ifc->ifc_len -= space;
1495 * Just like if_promisc(), but for all-multicast-reception mode.
1498 if_allmulti(struct ifnet *ifp, int onswitch)
1505 if (ifp->if_amcount++ == 0) {
1506 ifp->if_flags |= IFF_ALLMULTI;
1507 ifr.ifr_flags = ifp->if_flags;
1508 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1509 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1510 (struct ucred *)NULL);
1513 if (ifp->if_amcount > 1) {
1516 ifp->if_amcount = 0;
1517 ifp->if_flags &= ~IFF_ALLMULTI;
1518 ifr.ifr_flags = ifp->if_flags;
1519 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1520 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1521 (struct ucred *)NULL);
1532 * Add a multicast listenership to the interface in question.
1533 * The link layer provides a routine which converts
1537 struct ifnet *ifp, /* interface to manipulate */
1538 struct sockaddr *sa, /* address to add */
1539 struct ifmultiaddr **retifma)
1541 struct sockaddr *llsa, *dupsa;
1543 struct ifmultiaddr *ifma;
1546 * If the matching multicast address already exists
1547 * then don't add a new one, just add a reference
1549 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1550 if (sa_equal(sa, ifma->ifma_addr)) {
1551 ifma->ifma_refcount++;
1559 * Give the link layer a chance to accept/reject it, and also
1560 * find out which AF_LINK address this maps to, if it isn't one
1563 if (ifp->if_resolvemulti) {
1564 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1565 if (error) return error;
1570 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1571 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1572 bcopy(sa, dupsa, sa->sa_len);
1574 ifma->ifma_addr = dupsa;
1575 ifma->ifma_lladdr = llsa;
1576 ifma->ifma_ifp = ifp;
1577 ifma->ifma_refcount = 1;
1578 ifma->ifma_protospec = 0;
1579 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1582 * Some network interfaces can scan the address list at
1583 * interrupt time; lock them out.
1586 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1591 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1592 if (sa_equal(ifma->ifma_addr, llsa))
1596 ifma->ifma_refcount++;
1598 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1599 M_IFMADDR, M_WAITOK);
1600 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1601 M_IFMADDR, M_WAITOK);
1602 bcopy(llsa, dupsa, llsa->sa_len);
1603 ifma->ifma_addr = dupsa;
1604 ifma->ifma_ifp = ifp;
1605 ifma->ifma_refcount = 1;
1607 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1612 * We are certain we have added something, so call down to the
1613 * interface to let them know about it.
1616 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
1623 * Remove a reference to a multicast address on this interface. Yell
1624 * if the request does not match an existing membership.
1627 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
1629 struct ifmultiaddr *ifma;
1632 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1633 if (sa_equal(sa, ifma->ifma_addr))
1638 if (ifma->ifma_refcount > 1) {
1639 ifma->ifma_refcount--;
1643 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1644 sa = ifma->ifma_lladdr;
1646 LIST_REMOVE(ifma, ifma_link);
1648 * Make sure the interface driver is notified
1649 * in the case of a link layer mcast group being left.
1651 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
1652 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
1654 free(ifma->ifma_addr, M_IFMADDR);
1655 free(ifma, M_IFMADDR);
1660 * Now look for the link-layer address which corresponds to
1661 * this network address. It had been squirreled away in
1662 * ifma->ifma_lladdr for this purpose (so we don't have
1663 * to call ifp->if_resolvemulti() again), and we saved that
1664 * value in sa above. If some nasty deleted the
1665 * link-layer address out from underneath us, we can deal because
1666 * the address we stored was is not the same as the one which was
1667 * in the record for the link-layer address. (So we don't complain
1670 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1671 if (sa_equal(sa, ifma->ifma_addr))
1676 if (ifma->ifma_refcount > 1) {
1677 ifma->ifma_refcount--;
1682 LIST_REMOVE(ifma, ifma_link);
1683 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
1685 free(ifma->ifma_addr, M_IFMADDR);
1686 free(sa, M_IFMADDR);
1687 free(ifma, M_IFMADDR);
1693 * Set the link layer address on an interface.
1695 * At this time we only support certain types of interfaces,
1696 * and we don't allow the length of the address to change.
1699 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1701 struct sockaddr_dl *sdl;
1705 ifa = ifnet_addrs[ifp->if_index - 1];
1708 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1711 if (len != sdl->sdl_alen) /* don't allow length to change */
1713 switch (ifp->if_type) {
1714 case IFT_ETHER: /* these types use struct arpcom */
1719 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1722 bcopy(lladdr, LLADDR(sdl), len);
1728 * If the interface is already up, we need
1729 * to re-init it in order to reprogram its
1732 if ((ifp->if_flags & IFF_UP) != 0) {
1733 ifp->if_flags &= ~IFF_UP;
1734 ifr.ifr_flags = ifp->if_flags;
1735 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1736 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1737 (struct ucred *)NULL);
1738 ifp->if_flags |= IFF_UP;
1739 ifr.ifr_flags = ifp->if_flags;
1740 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1741 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1742 (struct ucred *)NULL);
1745 * Also send gratuitous ARPs to notify other nodes about
1746 * the address change.
1748 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1749 if (ifa->ifa_addr != NULL &&
1750 ifa->ifa_addr->sa_family == AF_INET)
1751 arp_ifinit(ifp, ifa);
1758 struct ifmultiaddr *
1759 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
1761 struct ifmultiaddr *ifma;
1763 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1764 if (sa_equal(ifma->ifma_addr, sa))
1771 * The name argument must be a pointer to storage which will last as
1772 * long as the interface does. For physical devices, the result of
1773 * device_get_name(dev) is a good choice and for pseudo-devices a
1774 * static string works well.
1777 if_initname(struct ifnet *ifp, const char *name, int unit)
1779 ifp->if_dname = name;
1780 ifp->if_dunit = unit;
1781 if (unit != IF_DUNIT_NONE)
1782 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1784 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1788 if_printf(struct ifnet *ifp, const char *fmt, ...)
1793 retval = printf("%s: ", ifp->if_xname);
1794 __va_start(ap, fmt);
1795 retval += vprintf(fmt, ap);
1800 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1801 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
1804 ifq_set_classic(struct ifaltq *ifq)
1806 ifq->altq_enqueue = ifq_classic_enqueue;
1807 ifq->altq_dequeue = ifq_classic_dequeue;
1808 ifq->altq_request = ifq_classic_request;
1812 ifq_classic_enqueue(struct ifaltq *ifq, struct mbuf *m,
1813 struct altq_pktattr *pa __unused)
1815 if (IF_QFULL(ifq)) {
1824 static struct mbuf *
1825 ifq_classic_dequeue(struct ifaltq *ifq, int op)
1837 panic("unsupported ALTQ dequeue op: %d", op);
1844 ifq_classic_request(struct ifaltq *ifq, int req, void *arg)
1851 panic("unspported ALTQ request: %d", req);