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 1.85.2.23 2003/04/15 18:11:19 fjoe Exp $
35 * $DragonFly: src/sys/net/if.c,v 1.8 2003/09/14 16:35:58 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/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 #include <sys/kernel.h>
51 #include <sys/sockio.h>
52 #include <sys/syslog.h>
53 #include <sys/sysctl.h>
56 #include <net/if_arp.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/if_var.h>
60 #include <net/radix.h>
61 #include <net/route.h>
62 #include <machine/stdarg.h>
64 #if defined(INET) || defined(INET6)
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/if_ether.h>
70 #include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
71 #include <netinet6/in6_var.h>
72 #include <netinet6/in6_ifattach.h>
76 #if defined(COMPAT_43)
77 #include <emulation/43bsd/43bsd_socket.h>
78 #endif /* COMPAT_43 */
81 * System initialization
84 static int ifconf (u_long, caddr_t);
85 static void ifinit (void *);
86 static void if_qflush (struct ifqueue *);
87 static void if_slowtimo (void *);
88 static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
89 static int if_rtdel (struct radix_node *, void *);
91 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
93 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
94 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
96 int ifqmaxlen = IFQ_MAXLEN;
97 struct ifnethead ifnet; /* depend on static init XXX */
101 * XXX: declare here to avoid to include many inet6 related files..
102 * should be more generalized?
104 extern void nd6_setmtu (struct ifnet *);
107 struct if_clone *if_clone_lookup (const char *, int *);
108 int if_clone_list (struct if_clonereq *);
110 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
111 int if_cloners_count;
114 * Network interface utility routines.
116 * Routines with ifa_ifwith* names take sockaddr *'s as
128 TAILQ_FOREACH(ifp, &ifnet, if_link) {
129 if (ifp->if_snd.ifq_maxlen == 0) {
130 printf("%s%d XXX: driver didn't set ifq_maxlen\n",
131 ifp->if_name, ifp->if_unit);
132 ifp->if_snd.ifq_maxlen = ifqmaxlen;
140 struct ifaddr **ifnet_addrs;
141 struct ifnet **ifindex2ifnet = NULL;
145 * Attach an interface to the
146 * list of "active" interfaces.
152 unsigned socksize, ifasize;
153 int namelen, masklen;
155 struct sockaddr_dl *sdl;
157 static int if_indexlim = 8;
165 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
166 ifp->if_index = ++if_index;
169 * The old code would work if the interface passed a pre-existing
170 * chain of ifaddrs to this code. We don't trust our callers to
171 * properly initialize the tailq, however, so we no longer allow
172 * this unlikely case.
174 TAILQ_INIT(&ifp->if_addrhead);
175 TAILQ_INIT(&ifp->if_prefixhead);
176 LIST_INIT(&ifp->if_multiaddrs);
177 getmicrotime(&ifp->if_lastchange);
178 if (ifnet_addrs == 0 || if_index >= if_indexlim) {
179 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
180 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
183 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
184 free((caddr_t)ifnet_addrs, M_IFADDR);
186 ifnet_addrs = (struct ifaddr **)q;
188 /* grow ifindex2ifnet */
189 n = if_indexlim * sizeof(struct ifnet *);
190 q = malloc(n, M_IFADDR, M_WAITOK);
193 bcopy((caddr_t)ifindex2ifnet, q, n/2);
194 free((caddr_t)ifindex2ifnet, M_IFADDR);
196 ifindex2ifnet = (struct ifnet **)q;
199 ifindex2ifnet[if_index] = ifp;
202 * create a Link Level name for this device
204 namelen = snprintf(workbuf, sizeof(workbuf),
205 "%s%d", ifp->if_name, ifp->if_unit);
206 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
207 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
208 socksize = masklen + ifp->if_addrlen;
209 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
210 if (socksize < sizeof(*sdl))
211 socksize = sizeof(*sdl);
212 socksize = ROUNDUP(socksize);
213 ifasize = sizeof(*ifa) + 2 * socksize;
214 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
216 bzero((caddr_t)ifa, ifasize);
217 sdl = (struct sockaddr_dl *)(ifa + 1);
218 sdl->sdl_len = socksize;
219 sdl->sdl_family = AF_LINK;
220 bcopy(workbuf, sdl->sdl_data, namelen);
221 sdl->sdl_nlen = namelen;
222 sdl->sdl_index = ifp->if_index;
223 sdl->sdl_type = ifp->if_type;
224 ifnet_addrs[if_index - 1] = ifa;
226 ifa->ifa_rtrequest = link_rtrequest;
227 ifa->ifa_addr = (struct sockaddr *)sdl;
228 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
229 ifa->ifa_netmask = (struct sockaddr *)sdl;
230 sdl->sdl_len = masklen;
232 sdl->sdl_data[--namelen] = 0xff;
233 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
236 /* Announce the interface. */
237 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
241 * Detach an interface, removing it from the
242 * list of "active" interfaces.
249 struct radix_node_head *rnh;
254 * Remove routes and flush queues.
260 * Remove address from ifnet_addrs[] and maybe decrement if_index.
261 * Clean up all addresses.
263 ifnet_addrs[ifp->if_index - 1] = 0;
264 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
267 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
268 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
270 /* XXX: Ugly!! ad hoc just for INET */
271 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
272 struct ifaliasreq ifr;
274 bzero(&ifr, sizeof(ifr));
275 ifr.ifra_addr = *ifa->ifa_addr;
276 if (ifa->ifa_dstaddr)
277 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
278 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
284 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
286 /* ifp_addrhead is already updated */
290 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
296 * Remove all IPv6 kernel structs related to ifp. This should be done
297 * before removing routing entries below, since IPv6 interface direct
298 * routes are expected to be removed by the IPv6-specific kernel API.
299 * Otherwise, the kernel will detect some inconsistency and bark it.
305 * Delete all remaining routes using this interface
306 * Unfortuneatly the only way to do this is to slog through
307 * the entire routing table looking for routes which point
308 * to this interface...oh well...
310 for (i = 1; i <= AF_MAX; i++) {
311 if ((rnh = rt_tables[i]) == NULL)
313 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
316 /* Announce that the interface is gone. */
317 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
319 TAILQ_REMOVE(&ifnet, ifp, if_link);
324 * Delete Routes for a Network Interface
326 * Called for each routing entry via the rnh->rnh_walktree() call above
327 * to delete all route entries referencing a detaching network interface.
330 * rn pointer to node in the routing table
331 * arg argument passed to rnh->rnh_walktree() - detaching interface
335 * errno failed - reason indicated
340 struct radix_node *rn;
343 struct rtentry *rt = (struct rtentry *)rn;
344 struct ifnet *ifp = arg;
347 if (rt->rt_ifp == ifp) {
350 * Protect (sorta) against walktree recursion problems
353 if ((rt->rt_flags & RTF_UP) == 0)
356 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
357 rt_mask(rt), rt->rt_flags,
358 (struct rtentry **) NULL);
360 log(LOG_WARNING, "if_rtdel: error %d\n", err);
368 * Create a clone network interface.
371 if_clone_create(name, len)
375 struct if_clone *ifc;
381 ifc = if_clone_lookup(name, &unit);
385 if (ifunit(name) != NULL)
388 wildcard = (unit < 0);
390 err = (*ifc->ifc_create)(ifc, &unit);
394 /* In the wildcard case, we need to update the name. */
396 for (dp = name; *dp != '\0'; dp++);
397 if (snprintf(dp, len - (dp-name), "%d", unit) >
398 len - (dp-name) - 1) {
400 * This can only be a programmer error and
401 * there's no straightforward way to recover if
404 panic("if_clone_create(): interface name too long");
413 * Destroy a clone network interface.
416 if_clone_destroy(name)
419 struct if_clone *ifc;
422 ifc = if_clone_lookup(name, NULL);
430 if (ifc->ifc_destroy == NULL)
433 (*ifc->ifc_destroy)(ifp);
438 * Look up a network interface cloner.
441 if_clone_lookup(name, unitp)
445 struct if_clone *ifc;
449 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
450 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
451 if (ifc->ifc_name[i] != *cp)
456 ifc = LIST_NEXT(ifc, ifc_list);
460 return ((struct if_clone *)NULL);
466 for (i = 0; *cp != '\0'; cp++) {
467 if (*cp < '0' || *cp > '9') {
468 /* Bogus unit number. */
471 i = (i * 10) + (*cp - '0');
481 * Register a network interface cloner.
485 struct if_clone *ifc;
488 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
493 * Unregister a network interface cloner.
497 struct if_clone *ifc;
500 LIST_REMOVE(ifc, ifc_list);
505 * Provide list of interface cloners to userspace.
509 struct if_clonereq *ifcr;
511 char outbuf[IFNAMSIZ], *dst;
512 struct if_clone *ifc;
513 int count, error = 0;
515 ifcr->ifcr_total = if_cloners_count;
516 if ((dst = ifcr->ifcr_buffer) == NULL) {
517 /* Just asking how many there are. */
521 if (ifcr->ifcr_count < 0)
524 count = (if_cloners_count < ifcr->ifcr_count) ?
525 if_cloners_count : ifcr->ifcr_count;
527 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
528 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
529 strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
530 outbuf[IFNAMSIZ - 1] = '\0'; /* sanity */
531 error = copyout(outbuf, dst, IFNAMSIZ);
540 * Locate an interface based on a complete address.
545 struct sockaddr *addr;
550 #define equal(a1, a2) \
551 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
552 TAILQ_FOREACH(ifp, &ifnet, if_link)
553 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
554 if (ifa->ifa_addr->sa_family != addr->sa_family)
556 if (equal(addr, ifa->ifa_addr))
558 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
559 /* IP6 doesn't have broadcast */
560 ifa->ifa_broadaddr->sa_len != 0 &&
561 equal(ifa->ifa_broadaddr, addr))
564 return ((struct ifaddr *)0);
567 * Locate the point to point interface with a given destination address.
571 ifa_ifwithdstaddr(addr)
572 struct sockaddr *addr;
577 TAILQ_FOREACH(ifp, &ifnet, if_link)
578 if (ifp->if_flags & IFF_POINTOPOINT)
579 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
580 if (ifa->ifa_addr->sa_family != addr->sa_family)
582 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
585 return ((struct ifaddr *)0);
589 * Find an interface on a specific network. If many, choice
590 * is most specific found.
594 struct sockaddr *addr;
598 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
599 u_int af = addr->sa_family;
600 char *addr_data = addr->sa_data, *cplim;
603 * AF_LINK addresses can be looked up directly by their index number,
604 * so do that if we can.
607 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
608 if (sdl->sdl_index && sdl->sdl_index <= if_index)
609 return (ifnet_addrs[sdl->sdl_index - 1]);
613 * Scan though each interface, looking for ones that have
614 * addresses in this address family.
616 TAILQ_FOREACH(ifp, &ifnet, if_link) {
617 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
618 char *cp, *cp2, *cp3;
620 if (ifa->ifa_addr->sa_family != af)
622 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
624 * This is a bit broken as it doesn't
625 * take into account that the remote end may
626 * be a single node in the network we are
628 * The trouble is that we don't know the
629 * netmask for the remote end.
631 if (ifa->ifa_dstaddr != 0
632 && equal(addr, ifa->ifa_dstaddr))
636 * if we have a special address handler,
637 * then use it instead of the generic one.
639 if (ifa->ifa_claim_addr) {
640 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
648 * Scan all the bits in the ifa's address.
649 * If a bit dissagrees with what we are
650 * looking for, mask it with the netmask
651 * to see if it really matters.
654 if (ifa->ifa_netmask == 0)
657 cp2 = ifa->ifa_addr->sa_data;
658 cp3 = ifa->ifa_netmask->sa_data;
659 cplim = ifa->ifa_netmask->sa_len
660 + (char *)ifa->ifa_netmask;
662 if ((*cp++ ^ *cp2++) & *cp3++)
663 goto next; /* next address! */
665 * If the netmask of what we just found
666 * is more specific than what we had before
667 * (if we had one) then remember the new one
668 * before continuing to search
669 * for an even better one.
671 if (ifa_maybe == 0 ||
672 rn_refines((caddr_t)ifa->ifa_netmask,
673 (caddr_t)ifa_maybe->ifa_netmask))
682 * Find an interface address specific to an interface best matching
686 ifaof_ifpforaddr(addr, ifp)
687 struct sockaddr *addr;
691 char *cp, *cp2, *cp3;
693 struct ifaddr *ifa_maybe = 0;
694 u_int af = addr->sa_family;
698 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
699 if (ifa->ifa_addr->sa_family != af)
703 if (ifa->ifa_netmask == 0) {
704 if (equal(addr, ifa->ifa_addr) ||
705 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
709 if (ifp->if_flags & IFF_POINTOPOINT) {
710 if (equal(addr, ifa->ifa_dstaddr))
714 cp2 = ifa->ifa_addr->sa_data;
715 cp3 = ifa->ifa_netmask->sa_data;
716 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
717 for (; cp3 < cplim; cp3++)
718 if ((*cp++ ^ *cp2++) & *cp3)
727 #include <net/route.h>
730 * Default action when installing a route with a Link Level gateway.
731 * Lookup an appropriate real ifa to point to.
732 * This should be moved to /sys/net/link.c eventually.
735 link_rtrequest(cmd, rt, info)
738 struct rt_addrinfo *info;
741 struct sockaddr *dst;
744 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
745 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
747 ifa = ifaof_ifpforaddr(dst, ifp);
752 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
753 ifa->ifa_rtrequest(cmd, rt, info);
758 * Mark an interface down and notify protocols of
760 * NOTE: must be called at splnet or eqivalent.
763 if_unroute(ifp, flag, fam)
769 ifp->if_flags &= ~flag;
770 getmicrotime(&ifp->if_lastchange);
771 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
772 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
773 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
774 if_qflush(&ifp->if_snd);
779 * Mark an interface up and notify protocols of
781 * NOTE: must be called at splnet or eqivalent.
784 if_route(ifp, flag, fam)
790 ifp->if_flags |= flag;
791 getmicrotime(&ifp->if_lastchange);
792 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
793 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
794 pfctlinput(PRC_IFUP, ifa->ifa_addr);
802 * Mark an interface down and notify protocols of
804 * NOTE: must be called at splnet or eqivalent.
811 if_unroute(ifp, IFF_UP, AF_UNSPEC);
815 * Mark an interface up and notify protocols of
817 * NOTE: must be called at splnet or eqivalent.
824 if_route(ifp, IFF_UP, AF_UNSPEC);
828 * Flush an interface queue.
837 while ((m = n) != 0) {
847 * Handle interface watchdog timer routines. Called
848 * from softclock, we decrement timers (if set) and
849 * call the appropriate interface routine on expiration.
858 TAILQ_FOREACH(ifp, &ifnet, if_link) {
859 if (ifp->if_timer == 0 || --ifp->if_timer)
861 if (ifp->if_watchdog)
862 (*ifp->if_watchdog)(ifp);
865 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
869 * Map interface name to
870 * interface structure pointer.
873 ifunit(const char *name)
875 char namebuf[IFNAMSIZ + 1];
883 if (len < 2 || len > IFNAMSIZ)
887 if (c < '0' || c > '9')
888 return NULL; /* trailing garbage */
893 return NULL; /* no interface name */
894 unit += (c - '0') * m;
896 return NULL; /* number is unreasonable */
899 } while (c >= '0' && c <= '9');
901 bcopy(name, namebuf, len);
904 * Now search all the interfaces for this name/number
906 TAILQ_FOREACH(ifp, &ifnet, if_link) {
907 if (strcmp(ifp->if_name, namebuf))
909 if (unit == ifp->if_unit)
917 * Map interface name in a sockaddr_dl to
918 * interface structure pointer.
924 char ifname[IFNAMSIZ+1];
925 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
927 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
928 (sdl->sdl_nlen > IFNAMSIZ) )
932 * ifunit wants a null-terminated name. It may not be null-terminated
933 * in the sockaddr. We don't want to change the caller's sockaddr,
934 * and there might not be room to put the trailing null anyway, so we
935 * make a local copy that we know we can null terminate safely.
938 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
939 ifname[sdl->sdl_nlen] = '\0';
940 return ifunit(ifname);
948 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
961 return (ifconf(cmd, data));
963 ifr = (struct ifreq *)data;
968 if ((error = suser(td)) != 0)
970 return ((cmd == SIOCIFCREATE) ?
971 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
972 if_clone_destroy(ifr->ifr_name));
975 return (if_clone_list((struct if_clonereq *)data));
978 ifp = ifunit(ifr->ifr_name);
984 ifr->ifr_flags = ifp->if_flags;
985 ifr->ifr_flagshigh = ifp->if_ipending >> 16;
989 ifr->ifr_reqcap = ifp->if_capabilities;
990 ifr->ifr_curcap = ifp->if_capenable;
994 ifr->ifr_metric = ifp->if_metric;
998 ifr->ifr_mtu = ifp->if_mtu;
1002 ifr->ifr_phys = ifp->if_physical;
1009 new_flags = (ifr->ifr_flags & 0xffff) |
1010 (ifr->ifr_flagshigh << 16);
1011 if (ifp->if_flags & IFF_SMART) {
1012 /* Smart drivers twiddle their own routes */
1013 } else if (ifp->if_flags & IFF_UP &&
1014 (new_flags & IFF_UP) == 0) {
1018 } else if (new_flags & IFF_UP &&
1019 (ifp->if_flags & IFF_UP) == 0) {
1024 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1025 (new_flags &~ IFF_CANTCHANGE);
1026 ifp->if_ipending = (ifp->if_ipending & IFF_CANTCHANGE) |
1027 (new_flags &~ IFF_CANTCHANGE);
1028 if (new_flags & IFF_PPROMISC) {
1029 /* Permanently promiscuous mode requested */
1030 ifp->if_flags |= IFF_PROMISC;
1031 } else if (ifp->if_pcount == 0) {
1032 ifp->if_flags &= ~IFF_PROMISC;
1035 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1036 getmicrotime(&ifp->if_lastchange);
1043 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1045 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1052 ifp->if_metric = ifr->ifr_metric;
1053 getmicrotime(&ifp->if_lastchange);
1062 error = (*ifp->if_ioctl)(ifp, cmd, data);
1064 getmicrotime(&ifp->if_lastchange);
1069 u_long oldmtu = ifp->if_mtu;
1074 if (ifp->if_ioctl == NULL)
1075 return (EOPNOTSUPP);
1076 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1078 error = (*ifp->if_ioctl)(ifp, cmd, data);
1080 getmicrotime(&ifp->if_lastchange);
1084 * If the link MTU changed, do network layer specific procedure.
1086 if (ifp->if_mtu != oldmtu) {
1100 /* Don't allow group membership on non-multicast interfaces. */
1101 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1104 /* Don't let users screw up protocols' entries. */
1105 if (ifr->ifr_addr.sa_family != AF_LINK)
1108 if (cmd == SIOCADDMULTI) {
1109 struct ifmultiaddr *ifma;
1110 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1112 error = if_delmulti(ifp, &ifr->ifr_addr);
1115 getmicrotime(&ifp->if_lastchange);
1118 case SIOCSIFPHYADDR:
1119 case SIOCDIFPHYADDR:
1121 case SIOCSIFPHYADDR_IN6:
1123 case SIOCSLIFPHYADDR:
1125 case SIOCSIFGENERIC:
1129 if (ifp->if_ioctl == 0)
1130 return (EOPNOTSUPP);
1131 error = (*ifp->if_ioctl)(ifp, cmd, data);
1133 getmicrotime(&ifp->if_lastchange);
1137 ifs = (struct ifstat *)data;
1138 ifs->ascii[0] = '\0';
1140 case SIOCGIFPSRCADDR:
1141 case SIOCGIFPDSTADDR:
1142 case SIOCGLIFPHYADDR:
1144 case SIOCGIFGENERIC:
1145 if (ifp->if_ioctl == 0)
1146 return (EOPNOTSUPP);
1147 return ((*ifp->if_ioctl)(ifp, cmd, data));
1153 return if_setlladdr(ifp,
1154 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1157 oif_flags = ifp->if_flags;
1158 if (so->so_proto == 0)
1159 return (EOPNOTSUPP);
1161 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
1170 case SIOCSIFDSTADDR:
1172 case SIOCSIFBRDADDR:
1173 case SIOCSIFNETMASK:
1174 #if BYTE_ORDER != BIG_ENDIAN
1175 if (ifr->ifr_addr.sa_family == 0 &&
1176 ifr->ifr_addr.sa_len < 16) {
1177 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1178 ifr->ifr_addr.sa_len = 16;
1181 if (ifr->ifr_addr.sa_len == 0)
1182 ifr->ifr_addr.sa_len = 16;
1190 case OSIOCGIFDSTADDR:
1191 cmd = SIOCGIFDSTADDR;
1194 case OSIOCGIFBRDADDR:
1195 cmd = SIOCGIFBRDADDR;
1198 case OSIOCGIFNETMASK:
1199 cmd = SIOCGIFNETMASK;
1201 error = ((*so->so_proto->pr_usrreqs->pru_control)
1202 (so, cmd, data, ifp, td));
1206 case OSIOCGIFDSTADDR:
1207 case OSIOCGIFBRDADDR:
1208 case OSIOCGIFNETMASK:
1209 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1213 #endif /* COMPAT_43 */
1215 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1217 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1218 if (ifp->if_flags & IFF_UP) {
1232 * Set/clear promiscuous mode on interface ifp based on the truth value
1233 * of pswitch. The calls are reference counted so that only the first
1234 * "on" request actually has an effect, as does the final "off" request.
1235 * Results are undefined if the "off" and "on" requests are not matched.
1238 ifpromisc(ifp, pswitch)
1246 oldflags = ifp->if_flags;
1247 if (ifp->if_ipending & IFF_PPROMISC) {
1248 /* Do nothing if device is in permanently promiscuous mode */
1249 ifp->if_pcount += pswitch ? 1 : -1;
1254 * If the device is not configured up, we cannot put it in
1257 if ((ifp->if_flags & IFF_UP) == 0)
1259 if (ifp->if_pcount++ != 0)
1261 ifp->if_flags |= IFF_PROMISC;
1262 log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
1263 ifp->if_name, ifp->if_unit);
1265 if (--ifp->if_pcount > 0)
1267 ifp->if_flags &= ~IFF_PROMISC;
1268 log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
1269 ifp->if_name, ifp->if_unit);
1271 ifr.ifr_flags = ifp->if_flags;
1272 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1273 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1277 ifp->if_flags = oldflags;
1282 * Return interface configuration
1283 * of system. List may be used
1284 * in later ioctl's (above) to get
1285 * other information.
1289 ifconf(u_long cmd, caddr_t data)
1291 struct ifconf *ifc = (struct ifconf *)data;
1294 struct sockaddr *sa;
1295 struct ifreq ifr, *ifrp;
1296 int space = ifc->ifc_len, error = 0;
1298 ifrp = ifc->ifc_req;
1299 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1303 if (space <= sizeof (ifr))
1305 ifnlen = snprintf(workbuf, sizeof(workbuf),
1306 "%s%d", ifp->if_name, ifp->if_unit);
1307 if(ifnlen + 1 > sizeof ifr.ifr_name) {
1308 error = ENAMETOOLONG;
1311 strcpy(ifr.ifr_name, workbuf);
1315 ifa = ifp->if_addrhead.tqh_first;
1316 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1317 if (space <= sizeof(ifr))
1320 if (curproc->p_ucred->cr_prison && prison_if(curthread, sa))
1324 if (cmd == OSIOCGIFCONF) {
1325 struct osockaddr *osa =
1326 (struct osockaddr *)&ifr.ifr_addr;
1328 osa->sa_family = sa->sa_family;
1329 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1334 if (sa->sa_len <= sizeof(*sa)) {
1336 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1340 if (space < sizeof (ifr) + sa->sa_len -
1343 space -= sa->sa_len - sizeof(*sa);
1344 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1345 sizeof (ifr.ifr_name));
1347 error = copyout((caddr_t)sa,
1348 (caddr_t)&ifrp->ifr_addr, sa->sa_len);
1349 ifrp = (struct ifreq *)
1350 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1354 space -= sizeof (ifr);
1359 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
1360 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1364 space -= sizeof (ifr);
1368 ifc->ifc_len -= space;
1373 * Just like if_promisc(), but for all-multicast-reception mode.
1376 if_allmulti(ifp, onswitch)
1385 if (ifp->if_amcount++ == 0) {
1386 ifp->if_flags |= IFF_ALLMULTI;
1387 ifr.ifr_flags = ifp->if_flags;
1388 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1389 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1392 if (ifp->if_amcount > 1) {
1395 ifp->if_amcount = 0;
1396 ifp->if_flags &= ~IFF_ALLMULTI;
1397 ifr.ifr_flags = ifp->if_flags;
1398 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1399 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1410 * Add a multicast listenership to the interface in question.
1411 * The link layer provides a routine which converts
1414 if_addmulti(ifp, sa, retifma)
1415 struct ifnet *ifp; /* interface to manipulate */
1416 struct sockaddr *sa; /* address to add */
1417 struct ifmultiaddr **retifma;
1419 struct sockaddr *llsa, *dupsa;
1421 struct ifmultiaddr *ifma;
1424 * If the matching multicast address already exists
1425 * then don't add a new one, just add a reference
1427 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1428 if (equal(sa, ifma->ifma_addr)) {
1429 ifma->ifma_refcount++;
1437 * Give the link layer a chance to accept/reject it, and also
1438 * find out which AF_LINK address this maps to, if it isn't one
1441 if (ifp->if_resolvemulti) {
1442 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1443 if (error) return error;
1448 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1449 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1450 bcopy(sa, dupsa, sa->sa_len);
1452 ifma->ifma_addr = dupsa;
1453 ifma->ifma_lladdr = llsa;
1454 ifma->ifma_ifp = ifp;
1455 ifma->ifma_refcount = 1;
1456 ifma->ifma_protospec = 0;
1457 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1460 * Some network interfaces can scan the address list at
1461 * interrupt time; lock them out.
1464 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1469 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1470 if (equal(ifma->ifma_addr, llsa))
1474 ifma->ifma_refcount++;
1476 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1477 M_IFMADDR, M_WAITOK);
1478 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1479 M_IFMADDR, M_WAITOK);
1480 bcopy(llsa, dupsa, llsa->sa_len);
1481 ifma->ifma_addr = dupsa;
1482 ifma->ifma_ifp = ifp;
1483 ifma->ifma_refcount = 1;
1485 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1490 * We are certain we have added something, so call down to the
1491 * interface to let them know about it.
1494 ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
1501 * Remove a reference to a multicast address on this interface. Yell
1502 * if the request does not match an existing membership.
1505 if_delmulti(ifp, sa)
1507 struct sockaddr *sa;
1509 struct ifmultiaddr *ifma;
1512 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1513 if (equal(sa, ifma->ifma_addr))
1518 if (ifma->ifma_refcount > 1) {
1519 ifma->ifma_refcount--;
1523 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1524 sa = ifma->ifma_lladdr;
1526 LIST_REMOVE(ifma, ifma_link);
1528 * Make sure the interface driver is notified
1529 * in the case of a link layer mcast group being left.
1531 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
1532 ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
1534 free(ifma->ifma_addr, M_IFMADDR);
1535 free(ifma, M_IFMADDR);
1540 * Now look for the link-layer address which corresponds to
1541 * this network address. It had been squirreled away in
1542 * ifma->ifma_lladdr for this purpose (so we don't have
1543 * to call ifp->if_resolvemulti() again), and we saved that
1544 * value in sa above. If some nasty deleted the
1545 * link-layer address out from underneath us, we can deal because
1546 * the address we stored was is not the same as the one which was
1547 * in the record for the link-layer address. (So we don't complain
1550 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1551 if (equal(sa, ifma->ifma_addr))
1556 if (ifma->ifma_refcount > 1) {
1557 ifma->ifma_refcount--;
1562 LIST_REMOVE(ifma, ifma_link);
1563 ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
1565 free(ifma->ifma_addr, M_IFMADDR);
1566 free(sa, M_IFMADDR);
1567 free(ifma, M_IFMADDR);
1573 * Set the link layer address on an interface.
1575 * At this time we only support certain types of interfaces,
1576 * and we don't allow the length of the address to change.
1579 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1581 struct sockaddr_dl *sdl;
1585 ifa = ifnet_addrs[ifp->if_index - 1];
1588 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1591 if (len != sdl->sdl_alen) /* don't allow length to change */
1593 switch (ifp->if_type) {
1594 case IFT_ETHER: /* these types use struct arpcom */
1599 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1602 bcopy(lladdr, LLADDR(sdl), len);
1608 * If the interface is already up, we need
1609 * to re-init it in order to reprogram its
1612 if ((ifp->if_flags & IFF_UP) != 0) {
1613 ifp->if_flags &= ~IFF_UP;
1614 ifr.ifr_flags = ifp->if_flags;
1615 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1616 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1617 ifp->if_flags |= IFF_UP;
1618 ifr.ifr_flags = ifp->if_flags;
1619 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1620 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1623 * Also send gratuitous ARPs to notify other nodes about
1624 * the address change.
1626 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1627 if (ifa->ifa_addr != NULL &&
1628 ifa->ifa_addr->sa_family == AF_INET)
1629 arp_ifinit(ifp, ifa);
1636 struct ifmultiaddr *
1637 ifmaof_ifpforaddr(sa, ifp)
1638 struct sockaddr *sa;
1641 struct ifmultiaddr *ifma;
1643 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1644 if (equal(ifma->ifma_addr, sa))
1651 if_printf(struct ifnet *ifp, const char *fmt, ...)
1656 retval = printf("%s%d: ", ifp->if_name, ifp->if_unit);
1658 retval += vprintf(fmt, ap);
1663 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1664 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");