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 1.24 2005/01/06 09:14:13 hsu 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>
58 #include <net/if_arp.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/if_var.h>
62 #include <net/radix.h>
63 #include <net/route.h>
64 #include <machine/stdarg.h>
66 #if defined(INET) || defined(INET6)
68 #include <netinet/in.h>
69 #include <netinet/in_var.h>
70 #include <netinet/if_ether.h>
72 #include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
73 #include <netinet6/in6_var.h>
74 #include <netinet6/in6_ifattach.h>
78 #if defined(COMPAT_43)
79 #include <emulation/43bsd/43bsd_socket.h>
80 #endif /* COMPAT_43 */
83 * System initialization
86 static int ifconf (u_long, caddr_t, struct thread *);
87 static void ifinit (void *);
88 static void if_qflush (struct ifqueue *);
89 static void if_slowtimo (void *);
90 static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
91 static int if_rtdel (struct radix_node *, void *);
93 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
95 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
96 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
97 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
99 int ifqmaxlen = IFQ_MAXLEN;
100 struct ifnethead ifnet; /* depend on static init XXX */
104 * XXX: declare here to avoid to include many inet6 related files..
105 * should be more generalized?
107 extern void nd6_setmtu (struct ifnet *);
110 struct if_clone *if_clone_lookup (const char *, int *);
111 int if_clone_list (struct if_clonereq *);
113 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
114 int if_cloners_count;
116 struct callout if_slowtimo_timer;
119 * Network interface utility routines.
121 * Routines with ifa_ifwith* names take sockaddr *'s as
131 callout_init(&if_slowtimo_timer);
134 TAILQ_FOREACH(ifp, &ifnet, if_link) {
135 if (ifp->if_snd.ifq_maxlen == 0) {
136 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
137 ifp->if_snd.ifq_maxlen = ifqmaxlen;
146 struct ifaddr **ifnet_addrs;
147 struct ifnet **ifindex2ifnet = NULL;
150 * Attach an interface to the
151 * list of "active" interfaces.
154 if_attach(struct ifnet *ifp)
156 unsigned socksize, ifasize;
157 int namelen, masklen;
158 struct sockaddr_dl *sdl;
160 static int if_indexlim = 8;
168 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
169 ifp->if_index = ++if_index;
172 * The old code would work if the interface passed a pre-existing
173 * chain of ifaddrs to this code. We don't trust our callers to
174 * properly initialize the tailq, however, so we no longer allow
175 * this unlikely case.
177 TAILQ_INIT(&ifp->if_addrhead);
178 TAILQ_INIT(&ifp->if_prefixhead);
179 LIST_INIT(&ifp->if_multiaddrs);
180 getmicrotime(&ifp->if_lastchange);
181 if (ifnet_addrs == NULL || if_index >= if_indexlim) {
182 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
183 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
185 if (ifnet_addrs != NULL) {
186 bcopy(ifnet_addrs, q, n/2);
187 free(ifnet_addrs, M_IFADDR);
189 ifnet_addrs = (struct ifaddr **)q;
191 /* grow ifindex2ifnet */
192 n = if_indexlim * sizeof(struct ifnet *);
193 q = malloc(n, M_IFADDR, M_WAITOK);
196 bcopy(ifindex2ifnet, q, n/2);
197 free(ifindex2ifnet, M_IFADDR);
199 ifindex2ifnet = (struct ifnet **)q;
202 ifindex2ifnet[if_index] = ifp;
205 * create a Link Level name for this device
207 namelen = strlen(ifp->if_xname);
208 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
209 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
210 socksize = masklen + ifp->if_addrlen;
211 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
212 if (socksize < sizeof(*sdl))
213 socksize = sizeof(*sdl);
214 socksize = ROUNDUP(socksize);
215 ifasize = sizeof(*ifa) + 2 * socksize;
216 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
219 sdl = (struct sockaddr_dl *)(ifa + 1);
220 sdl->sdl_len = socksize;
221 sdl->sdl_family = AF_LINK;
222 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
223 sdl->sdl_nlen = namelen;
224 sdl->sdl_index = ifp->if_index;
225 sdl->sdl_type = ifp->if_type;
226 ifnet_addrs[if_index - 1] = ifa;
228 ifa->ifa_rtrequest = link_rtrequest;
229 ifa->ifa_addr = (struct sockaddr *)sdl;
230 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
231 ifa->ifa_netmask = (struct sockaddr *)sdl;
232 sdl->sdl_len = masklen;
234 sdl->sdl_data[--namelen] = 0xff;
235 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
238 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
240 /* Announce the interface. */
241 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
245 * Detach an interface, removing it from the
246 * list of "active" interfaces.
249 if_detach(struct ifnet *ifp)
252 struct radix_node_head *rnh;
256 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
259 * Remove routes and flush queues.
265 * Remove address from ifnet_addrs[] and maybe decrement if_index.
266 * Clean up all addresses.
268 ifnet_addrs[ifp->if_index - 1] = 0;
269 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
272 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
273 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
275 /* XXX: Ugly!! ad hoc just for INET */
276 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
277 struct ifaliasreq ifr;
279 bzero(&ifr, sizeof ifr);
280 ifr.ifra_addr = *ifa->ifa_addr;
281 if (ifa->ifa_dstaddr)
282 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
283 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
289 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
291 /* ifp_addrhead is already updated */
295 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
301 * Remove all IPv6 kernel structs related to ifp. This should be done
302 * before removing routing entries below, since IPv6 interface direct
303 * routes are expected to be removed by the IPv6-specific kernel API.
304 * Otherwise, the kernel will detect some inconsistency and bark it.
310 * Delete all remaining routes using this interface
311 * Unfortuneatly the only way to do this is to slog through
312 * the entire routing table looking for routes which point
313 * to this interface...oh well...
315 for (i = 1; i <= AF_MAX; i++) {
316 if ((rnh = rt_tables[i]) == NULL)
318 rnh->rnh_walktree(rnh, if_rtdel, ifp);
321 /* Announce that the interface is gone. */
322 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
324 ifindex2ifnet[ifp->if_index] = NULL;
326 TAILQ_REMOVE(&ifnet, ifp, if_link);
331 * Delete Routes for a Network Interface
333 * Called for each routing entry via the rnh->rnh_walktree() call above
334 * to delete all route entries referencing a detaching network interface.
337 * rn pointer to node in the routing table
338 * arg argument passed to rnh->rnh_walktree() - detaching interface
342 * errno failed - reason indicated
346 if_rtdel(struct radix_node *rn, void *arg)
348 struct rtentry *rt = (struct rtentry *)rn;
349 struct ifnet *ifp = arg;
352 if (rt->rt_ifp == ifp) {
355 * Protect (sorta) against walktree recursion problems
358 if (!(rt->rt_flags & RTF_UP))
361 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
362 rt_mask(rt), rt->rt_flags,
363 (struct rtentry **) NULL);
365 log(LOG_WARNING, "if_rtdel: error %d\n", err);
373 * Create a clone network interface.
376 if_clone_create(char *name, int len)
378 struct if_clone *ifc;
380 int wildcard, bytoff, bitoff;
384 ifc = if_clone_lookup(name, &unit);
388 if (ifunit(name) != NULL)
392 wildcard = (unit < 0);
394 * Find a free unit if none was given.
397 while (bytoff < ifc->ifc_bmlen &&
398 ifc->ifc_units[bytoff] == 0xff)
400 if (bytoff >= ifc->ifc_bmlen)
402 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
404 unit = (bytoff << 3) + bitoff;
407 if (unit > ifc->ifc_maxunit)
410 err = (*ifc->ifc_create)(ifc, unit);
416 bitoff = unit - (bytoff << 3);
420 * Allocate the unit in the bitmap.
422 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
423 ("%s: bit is already set", __func__));
424 ifc->ifc_units[bytoff] |= (1 << bitoff);
426 /* In the wildcard case, we need to update the name. */
428 for (dp = name; *dp != '\0'; dp++);
429 if (snprintf(dp, len - (dp-name), "%d", unit) >
430 len - (dp-name) - 1) {
432 * This can only be a programmer error and
433 * there's no straightforward way to recover if
436 panic("if_clone_create(): interface name too long");
441 EVENTHANDLER_INVOKE(if_clone_event, ifc);
447 * Destroy a clone network interface.
450 if_clone_destroy(const char *name)
452 struct if_clone *ifc;
457 ifc = if_clone_lookup(name, &unit);
461 if (unit < ifc->ifc_minifs)
468 if (ifc->ifc_destroy == NULL)
471 (*ifc->ifc_destroy)(ifp);
474 * Compute offset in the bitmap and deallocate the unit.
477 bitoff = unit - (bytoff << 3);
478 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
479 ("%s: bit is already cleared", __func__));
480 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
485 * Look up a network interface cloner.
488 if_clone_lookup(const char *name, int *unitp)
490 struct if_clone *ifc;
494 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
495 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
496 if (ifc->ifc_name[i] != *cp)
501 ifc = LIST_NEXT(ifc, ifc_list);
505 return ((struct if_clone *)NULL);
511 for (i = 0; *cp != '\0'; cp++) {
512 if (*cp < '0' || *cp > '9') {
513 /* Bogus unit number. */
516 i = (i * 10) + (*cp - '0');
526 * Register a network interface cloner.
529 if_clone_attach(struct if_clone *ifc)
536 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
537 ("%s: %s requested more units then allowed (%d > %d)",
538 __func__, ifc->ifc_name, ifc->ifc_minifs,
539 ifc->ifc_maxunit + 1));
541 * Compute bitmap size and allocate it.
543 maxclone = ifc->ifc_maxunit + 1;
545 if ((len << 3) < maxclone)
547 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
548 ifc->ifc_bmlen = len;
550 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
553 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
554 err = (*ifc->ifc_create)(ifc, unit);
556 ("%s: failed to create required interface %s%d",
557 __func__, ifc->ifc_name, unit));
559 /* Allocate the unit in the bitmap. */
561 bitoff = unit - (bytoff << 3);
562 ifc->ifc_units[bytoff] |= (1 << bitoff);
567 * Unregister a network interface cloner.
570 if_clone_detach(struct if_clone *ifc)
573 LIST_REMOVE(ifc, ifc_list);
574 free(ifc->ifc_units, M_CLONE);
579 * Provide list of interface cloners to userspace.
582 if_clone_list(struct if_clonereq *ifcr)
584 char outbuf[IFNAMSIZ], *dst;
585 struct if_clone *ifc;
586 int count, error = 0;
588 ifcr->ifcr_total = if_cloners_count;
589 if ((dst = ifcr->ifcr_buffer) == NULL) {
590 /* Just asking how many there are. */
594 if (ifcr->ifcr_count < 0)
597 count = (if_cloners_count < ifcr->ifcr_count) ?
598 if_cloners_count : ifcr->ifcr_count;
600 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
601 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
602 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
603 error = copyout(outbuf, dst, IFNAMSIZ);
612 * Locate an interface based on a complete address.
615 ifa_ifwithaddr(struct sockaddr *addr)
620 TAILQ_FOREACH(ifp, &ifnet, if_link)
621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
622 if (ifa->ifa_addr->sa_family != addr->sa_family)
624 if (sa_equal(addr, ifa->ifa_addr))
626 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
627 /* IPv6 doesn't have broadcast */
628 ifa->ifa_broadaddr->sa_len != 0 &&
629 sa_equal(ifa->ifa_broadaddr, addr))
632 return ((struct ifaddr *)NULL);
635 * Locate the point to point interface with a given destination address.
638 ifa_ifwithdstaddr(struct sockaddr *addr)
643 TAILQ_FOREACH(ifp, &ifnet, if_link)
644 if (ifp->if_flags & IFF_POINTOPOINT)
645 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
646 if (ifa->ifa_addr->sa_family != addr->sa_family)
648 if (ifa->ifa_dstaddr &&
649 sa_equal(addr, ifa->ifa_dstaddr))
652 return ((struct ifaddr *)NULL);
656 * Find an interface on a specific network. If many, choice
657 * is most specific found.
660 ifa_ifwithnet(struct sockaddr *addr)
664 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
665 u_int af = addr->sa_family;
666 char *addr_data = addr->sa_data, *cplim;
669 * AF_LINK addresses can be looked up directly by their index number,
670 * so do that if we can.
673 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
674 if (sdl->sdl_index && sdl->sdl_index <= if_index)
675 return (ifnet_addrs[sdl->sdl_index - 1]);
679 * Scan though each interface, looking for ones that have
680 * addresses in this address family.
682 TAILQ_FOREACH(ifp, &ifnet, if_link) {
683 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
684 char *cp, *cp2, *cp3;
686 if (ifa->ifa_addr->sa_family != af)
688 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
690 * This is a bit broken as it doesn't
691 * take into account that the remote end may
692 * be a single node in the network we are
694 * The trouble is that we don't know the
695 * netmask for the remote end.
697 if (ifa->ifa_dstaddr != NULL &&
698 sa_equal(addr, ifa->ifa_dstaddr))
702 * if we have a special address handler,
703 * then use it instead of the generic one.
705 if (ifa->ifa_claim_addr) {
706 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
714 * Scan all the bits in the ifa's address.
715 * If a bit dissagrees with what we are
716 * looking for, mask it with the netmask
717 * to see if it really matters.
720 if (ifa->ifa_netmask == 0)
723 cp2 = ifa->ifa_addr->sa_data;
724 cp3 = ifa->ifa_netmask->sa_data;
725 cplim = ifa->ifa_netmask->sa_len
726 + (char *)ifa->ifa_netmask;
728 if ((*cp++ ^ *cp2++) & *cp3++)
729 goto next; /* next address! */
731 * If the netmask of what we just found
732 * is more specific than what we had before
733 * (if we had one) then remember the new one
734 * before continuing to search
735 * for an even better one.
737 if (ifa_maybe == 0 ||
738 rn_refines((char *)ifa->ifa_netmask,
739 (char *)ifa_maybe->ifa_netmask))
748 * Find an interface address specific to an interface best matching
752 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
755 char *cp, *cp2, *cp3;
757 struct ifaddr *ifa_maybe = 0;
758 u_int af = addr->sa_family;
762 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
763 if (ifa->ifa_addr->sa_family != af)
767 if (ifa->ifa_netmask == NULL) {
768 if (sa_equal(addr, ifa->ifa_addr) ||
769 (ifa->ifa_dstaddr != NULL &&
770 sa_equal(addr, ifa->ifa_dstaddr)))
774 if (ifp->if_flags & IFF_POINTOPOINT) {
775 if (sa_equal(addr, ifa->ifa_dstaddr))
779 cp2 = ifa->ifa_addr->sa_data;
780 cp3 = ifa->ifa_netmask->sa_data;
781 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
782 for (; cp3 < cplim; cp3++)
783 if ((*cp++ ^ *cp2++) & *cp3)
792 #include <net/route.h>
795 * Default action when installing a route with a Link Level gateway.
796 * Lookup an appropriate real ifa to point to.
797 * This should be moved to /sys/net/link.c eventually.
800 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
803 struct sockaddr *dst;
806 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL ||
807 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL)
809 ifa = ifaof_ifpforaddr(dst, ifp);
814 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
815 ifa->ifa_rtrequest(cmd, rt, info);
820 * Mark an interface down and notify protocols of
822 * NOTE: must be called at splnet or eqivalent.
825 if_unroute(struct ifnet *ifp, int flag, int fam)
829 ifp->if_flags &= ~flag;
830 getmicrotime(&ifp->if_lastchange);
831 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
832 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
833 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
834 if_qflush(&ifp->if_snd);
839 * Mark an interface up and notify protocols of
841 * NOTE: must be called at splnet or eqivalent.
844 if_route(struct ifnet *ifp, int flag, int fam)
848 ifp->if_flags |= flag;
849 getmicrotime(&ifp->if_lastchange);
850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
852 pfctlinput(PRC_IFUP, ifa->ifa_addr);
860 * Mark an interface down and notify protocols of
862 * NOTE: must be called at splnet or eqivalent.
865 if_down(struct ifnet *ifp)
868 if_unroute(ifp, IFF_UP, AF_UNSPEC);
872 * Mark an interface up and notify protocols of
874 * NOTE: must be called at splnet or eqivalent.
877 if_up(struct ifnet *ifp)
880 if_route(ifp, IFF_UP, AF_UNSPEC);
884 * Flush an interface queue.
887 if_qflush(struct ifqueue *ifq)
892 while ((m = n) != 0) {
902 * Handle interface watchdog timer routines. Called
903 * from softclock, we decrement timers (if set) and
904 * call the appropriate interface routine on expiration.
907 if_slowtimo(void *arg)
912 TAILQ_FOREACH(ifp, &ifnet, if_link) {
913 if (ifp->if_timer == 0 || --ifp->if_timer)
915 if (ifp->if_watchdog)
916 (*ifp->if_watchdog)(ifp);
919 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
923 * Map interface name to
924 * interface structure pointer.
927 ifunit(const char *name)
932 * Search all the interfaces for this name/number
935 TAILQ_FOREACH(ifp, &ifnet, if_link) {
936 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
944 * Map interface name in a sockaddr_dl to
945 * interface structure pointer.
948 if_withname(struct sockaddr *sa)
950 char ifname[IFNAMSIZ+1];
951 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
953 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
954 (sdl->sdl_nlen > IFNAMSIZ) )
958 * ifunit wants a null-terminated name. It may not be null-terminated
959 * in the sockaddr. We don't want to change the caller's sockaddr,
960 * and there might not be room to put the trailing null anyway, so we
961 * make a local copy that we know we can null terminate safely.
964 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
965 ifname[sdl->sdl_nlen] = '\0';
966 return ifunit(ifname);
974 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
982 size_t namelen, onamelen;
983 char new_name[IFNAMSIZ];
985 struct sockaddr_dl *sdl;
991 return (ifconf(cmd, data, td));
993 ifr = (struct ifreq *)data;
998 if ((error = suser(td)) != 0)
1000 return ((cmd == SIOCIFCREATE) ?
1001 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1002 if_clone_destroy(ifr->ifr_name));
1004 case SIOCIFGCLONERS:
1005 return (if_clone_list((struct if_clonereq *)data));
1008 ifp = ifunit(ifr->ifr_name);
1014 ifr->ifr_flags = ifp->if_flags;
1015 ifr->ifr_flagshigh = ifp->if_flags >> 16;
1019 ifr->ifr_reqcap = ifp->if_capabilities;
1020 ifr->ifr_curcap = ifp->if_capenable;
1024 ifr->ifr_metric = ifp->if_metric;
1028 ifr->ifr_mtu = ifp->if_mtu;
1032 ifr->ifr_phys = ifp->if_physical;
1039 new_flags = (ifr->ifr_flags & 0xffff) |
1040 (ifr->ifr_flagshigh << 16);
1041 if (ifp->if_flags & IFF_SMART) {
1042 /* Smart drivers twiddle their own routes */
1043 } else if (ifp->if_flags & IFF_UP &&
1044 (new_flags & IFF_UP) == 0) {
1048 } else if (new_flags & IFF_UP &&
1049 (ifp->if_flags & IFF_UP) == 0) {
1054 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1055 (new_flags &~ IFF_CANTCHANGE);
1056 if (new_flags & IFF_PPROMISC) {
1057 /* Permanently promiscuous mode requested */
1058 ifp->if_flags |= IFF_PROMISC;
1059 } else if (ifp->if_pcount == 0) {
1060 ifp->if_flags &= ~IFF_PROMISC;
1063 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1064 getmicrotime(&ifp->if_lastchange);
1071 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1073 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1080 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1083 if (new_name[0] == '\0')
1085 if (ifunit(new_name) != NULL)
1088 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
1090 /* Announce the departure of the interface. */
1091 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1093 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1094 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1095 /* XXX IFA_LOCK(ifa); */
1096 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1097 namelen = strlen(new_name);
1098 onamelen = sdl->sdl_nlen;
1100 * Move the address if needed. This is safe because we
1101 * allocate space for a name of length IFNAMSIZ when we
1102 * create this in if_attach().
1104 if (namelen != onamelen) {
1105 bcopy(sdl->sdl_data + onamelen,
1106 sdl->sdl_data + namelen, sdl->sdl_alen);
1108 bcopy(new_name, sdl->sdl_data, namelen);
1109 sdl->sdl_nlen = namelen;
1110 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1111 bzero(sdl->sdl_data, onamelen);
1112 while (namelen != 0)
1113 sdl->sdl_data[--namelen] = 0xff;
1114 /* XXX IFA_UNLOCK(ifa) */
1116 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
1118 /* Announce the return of the interface. */
1119 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1126 ifp->if_metric = ifr->ifr_metric;
1127 getmicrotime(&ifp->if_lastchange);
1136 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1138 getmicrotime(&ifp->if_lastchange);
1143 u_long oldmtu = ifp->if_mtu;
1148 if (ifp->if_ioctl == NULL)
1149 return (EOPNOTSUPP);
1150 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1152 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1154 getmicrotime(&ifp->if_lastchange);
1158 * If the link MTU changed, do network layer specific procedure.
1160 if (ifp->if_mtu != oldmtu) {
1174 /* Don't allow group membership on non-multicast interfaces. */
1175 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1178 /* Don't let users screw up protocols' entries. */
1179 if (ifr->ifr_addr.sa_family != AF_LINK)
1182 if (cmd == SIOCADDMULTI) {
1183 struct ifmultiaddr *ifma;
1184 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1186 error = if_delmulti(ifp, &ifr->ifr_addr);
1189 getmicrotime(&ifp->if_lastchange);
1192 case SIOCSIFPHYADDR:
1193 case SIOCDIFPHYADDR:
1195 case SIOCSIFPHYADDR_IN6:
1197 case SIOCSLIFPHYADDR:
1199 case SIOCSIFGENERIC:
1203 if (ifp->if_ioctl == 0)
1204 return (EOPNOTSUPP);
1205 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
1207 getmicrotime(&ifp->if_lastchange);
1211 ifs = (struct ifstat *)data;
1212 ifs->ascii[0] = '\0';
1214 case SIOCGIFPSRCADDR:
1215 case SIOCGIFPDSTADDR:
1216 case SIOCGLIFPHYADDR:
1218 case SIOCGIFGENERIC:
1219 if (ifp->if_ioctl == 0)
1220 return (EOPNOTSUPP);
1221 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
1227 return if_setlladdr(ifp,
1228 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1231 oif_flags = ifp->if_flags;
1232 if (so->so_proto == 0)
1233 return (EOPNOTSUPP);
1235 error = so_pru_control(so, cmd, data, ifp, td);
1242 case SIOCSIFDSTADDR:
1244 case SIOCSIFBRDADDR:
1245 case SIOCSIFNETMASK:
1246 #if BYTE_ORDER != BIG_ENDIAN
1247 if (ifr->ifr_addr.sa_family == 0 &&
1248 ifr->ifr_addr.sa_len < 16) {
1249 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1250 ifr->ifr_addr.sa_len = 16;
1253 if (ifr->ifr_addr.sa_len == 0)
1254 ifr->ifr_addr.sa_len = 16;
1262 case OSIOCGIFDSTADDR:
1263 cmd = SIOCGIFDSTADDR;
1266 case OSIOCGIFBRDADDR:
1267 cmd = SIOCGIFBRDADDR;
1270 case OSIOCGIFNETMASK:
1271 cmd = SIOCGIFNETMASK;
1273 error = so_pru_control(so, cmd, data, ifp, td);
1277 case OSIOCGIFDSTADDR:
1278 case OSIOCGIFBRDADDR:
1279 case OSIOCGIFNETMASK:
1280 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1284 #endif /* COMPAT_43 */
1286 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1288 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1289 if (ifp->if_flags & IFF_UP) {
1303 * Set/clear promiscuous mode on interface ifp based on the truth value
1304 * of pswitch. The calls are reference counted so that only the first
1305 * "on" request actually has an effect, as does the final "off" request.
1306 * Results are undefined if the "off" and "on" requests are not matched.
1309 ifpromisc(struct ifnet *ifp, int pswitch)
1315 oldflags = ifp->if_flags;
1316 if (ifp->if_flags & IFF_PPROMISC) {
1317 /* Do nothing if device is in permanently promiscuous mode */
1318 ifp->if_pcount += pswitch ? 1 : -1;
1323 * If the device is not configured up, we cannot put it in
1326 if ((ifp->if_flags & IFF_UP) == 0)
1328 if (ifp->if_pcount++ != 0)
1330 ifp->if_flags |= IFF_PROMISC;
1331 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1334 if (--ifp->if_pcount > 0)
1336 ifp->if_flags &= ~IFF_PROMISC;
1337 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1340 ifr.ifr_flags = ifp->if_flags;
1341 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1342 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1343 (struct ucred *)NULL);
1347 ifp->if_flags = oldflags;
1352 * Return interface configuration
1353 * of system. List may be used
1354 * in later ioctl's (above) to get
1355 * other information.
1358 ifconf(u_long cmd, caddr_t data, struct thread *td)
1360 struct ifconf *ifc = (struct ifconf *)data;
1363 struct sockaddr *sa;
1364 struct ifreq ifr, *ifrp;
1365 int space = ifc->ifc_len, error = 0;
1367 ifrp = ifc->ifc_req;
1368 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1371 if (space <= sizeof ifr)
1373 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1374 >= sizeof(ifr.ifr_name)) {
1375 error = ENAMETOOLONG;
1380 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1381 if (space <= sizeof ifr)
1384 if (td->td_proc->p_ucred->cr_prison &&
1389 if (cmd == OSIOCGIFCONF) {
1390 struct osockaddr *osa =
1391 (struct osockaddr *)&ifr.ifr_addr;
1393 osa->sa_family = sa->sa_family;
1394 error = copyout(&ifr, ifrp, sizeof ifr);
1398 if (sa->sa_len <= sizeof(*sa)) {
1400 error = copyout(&ifr, ifrp, sizeof ifr);
1403 if (space < (sizeof ifr) + sa->sa_len -
1406 space -= sa->sa_len - sizeof(*sa);
1407 error = copyout(&ifr, ifrp,
1408 sizeof ifr.ifr_name);
1410 error = copyout(sa, &ifrp->ifr_addr,
1412 ifrp = (struct ifreq *)
1413 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1417 space -= sizeof ifr;
1422 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1423 error = copyout(&ifr, ifrp, sizeof ifr);
1426 space -= sizeof ifr;
1430 ifc->ifc_len -= space;
1435 * Just like if_promisc(), but for all-multicast-reception mode.
1438 if_allmulti(struct ifnet *ifp, int onswitch)
1445 if (ifp->if_amcount++ == 0) {
1446 ifp->if_flags |= IFF_ALLMULTI;
1447 ifr.ifr_flags = ifp->if_flags;
1448 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1449 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1450 (struct ucred *)NULL);
1453 if (ifp->if_amcount > 1) {
1456 ifp->if_amcount = 0;
1457 ifp->if_flags &= ~IFF_ALLMULTI;
1458 ifr.ifr_flags = ifp->if_flags;
1459 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1460 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1461 (struct ucred *)NULL);
1472 * Add a multicast listenership to the interface in question.
1473 * The link layer provides a routine which converts
1477 struct ifnet *ifp, /* interface to manipulate */
1478 struct sockaddr *sa, /* address to add */
1479 struct ifmultiaddr **retifma)
1481 struct sockaddr *llsa, *dupsa;
1483 struct ifmultiaddr *ifma;
1486 * If the matching multicast address already exists
1487 * then don't add a new one, just add a reference
1489 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1490 if (sa_equal(sa, ifma->ifma_addr)) {
1491 ifma->ifma_refcount++;
1499 * Give the link layer a chance to accept/reject it, and also
1500 * find out which AF_LINK address this maps to, if it isn't one
1503 if (ifp->if_resolvemulti) {
1504 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1505 if (error) return error;
1510 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1511 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1512 bcopy(sa, dupsa, sa->sa_len);
1514 ifma->ifma_addr = dupsa;
1515 ifma->ifma_lladdr = llsa;
1516 ifma->ifma_ifp = ifp;
1517 ifma->ifma_refcount = 1;
1518 ifma->ifma_protospec = 0;
1519 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1522 * Some network interfaces can scan the address list at
1523 * interrupt time; lock them out.
1526 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1531 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1532 if (sa_equal(ifma->ifma_addr, llsa))
1536 ifma->ifma_refcount++;
1538 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1539 M_IFMADDR, M_WAITOK);
1540 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1541 M_IFMADDR, M_WAITOK);
1542 bcopy(llsa, dupsa, llsa->sa_len);
1543 ifma->ifma_addr = dupsa;
1544 ifma->ifma_ifp = ifp;
1545 ifma->ifma_refcount = 1;
1547 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1552 * We are certain we have added something, so call down to the
1553 * interface to let them know about it.
1556 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
1563 * Remove a reference to a multicast address on this interface. Yell
1564 * if the request does not match an existing membership.
1567 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
1569 struct ifmultiaddr *ifma;
1572 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1573 if (sa_equal(sa, ifma->ifma_addr))
1578 if (ifma->ifma_refcount > 1) {
1579 ifma->ifma_refcount--;
1583 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1584 sa = ifma->ifma_lladdr;
1586 LIST_REMOVE(ifma, ifma_link);
1588 * Make sure the interface driver is notified
1589 * in the case of a link layer mcast group being left.
1591 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
1592 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
1594 free(ifma->ifma_addr, M_IFMADDR);
1595 free(ifma, M_IFMADDR);
1600 * Now look for the link-layer address which corresponds to
1601 * this network address. It had been squirreled away in
1602 * ifma->ifma_lladdr for this purpose (so we don't have
1603 * to call ifp->if_resolvemulti() again), and we saved that
1604 * value in sa above. If some nasty deleted the
1605 * link-layer address out from underneath us, we can deal because
1606 * the address we stored was is not the same as the one which was
1607 * in the record for the link-layer address. (So we don't complain
1610 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1611 if (sa_equal(sa, ifma->ifma_addr))
1616 if (ifma->ifma_refcount > 1) {
1617 ifma->ifma_refcount--;
1622 LIST_REMOVE(ifma, ifma_link);
1623 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
1625 free(ifma->ifma_addr, M_IFMADDR);
1626 free(sa, M_IFMADDR);
1627 free(ifma, M_IFMADDR);
1633 * Set the link layer address on an interface.
1635 * At this time we only support certain types of interfaces,
1636 * and we don't allow the length of the address to change.
1639 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1641 struct sockaddr_dl *sdl;
1645 ifa = ifnet_addrs[ifp->if_index - 1];
1648 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1651 if (len != sdl->sdl_alen) /* don't allow length to change */
1653 switch (ifp->if_type) {
1654 case IFT_ETHER: /* these types use struct arpcom */
1659 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1662 bcopy(lladdr, LLADDR(sdl), len);
1668 * If the interface is already up, we need
1669 * to re-init it in order to reprogram its
1672 if ((ifp->if_flags & IFF_UP) != 0) {
1673 ifp->if_flags &= ~IFF_UP;
1674 ifr.ifr_flags = ifp->if_flags;
1675 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1676 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1677 (struct ucred *)NULL);
1678 ifp->if_flags |= IFF_UP;
1679 ifr.ifr_flags = ifp->if_flags;
1680 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1681 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1682 (struct ucred *)NULL);
1685 * Also send gratuitous ARPs to notify other nodes about
1686 * the address change.
1688 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1689 if (ifa->ifa_addr != NULL &&
1690 ifa->ifa_addr->sa_family == AF_INET)
1691 arp_ifinit(ifp, ifa);
1698 struct ifmultiaddr *
1699 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
1701 struct ifmultiaddr *ifma;
1703 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1704 if (sa_equal(ifma->ifma_addr, sa))
1711 * The name argument must be a pointer to storage which will last as
1712 * long as the interface does. For physical devices, the result of
1713 * device_get_name(dev) is a good choice and for pseudo-devices a
1714 * static string works well.
1717 if_initname(struct ifnet *ifp, const char *name, int unit)
1719 ifp->if_dname = name;
1720 ifp->if_dunit = unit;
1721 if (unit != IF_DUNIT_NONE)
1722 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1724 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1728 if_printf(struct ifnet *ifp, const char *fmt, ...)
1733 retval = printf("%s: ", ifp->if_xname);
1734 __va_start(ap, fmt);
1735 retval += vprintf(fmt, ap);
1740 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1741 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");