2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)if.c 8.5 (Berkeley) 1/9/95
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
39 #include <sys/param.h>
40 #include <sys/types.h>
43 #include <sys/malloc.h>
47 #include <sys/systm.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.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/taskqueue.h>
57 #include <sys/domain.h>
59 #include <machine/stdarg.h>
62 #include <net/if_clone.h>
63 #include <net/if_dl.h>
64 #include <net/if_types.h>
65 #include <net/if_var.h>
66 #include <net/radix.h>
67 #include <net/route.h>
69 #if defined(INET) || defined(INET6)
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
74 #include <netinet6/in6_var.h>
75 #include <netinet6/in6_ifattach.h>
79 #include <netinet/if_ether.h>
82 #include <netinet/ip_carp.h>
85 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
86 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
88 /* Log link state change events */
89 static int log_link_state_change = 1;
91 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
92 &log_link_state_change, 0,
93 "log interface link state change events");
95 void (*bstp_linkstate_p)(struct ifnet *ifp, int state);
96 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
98 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
100 static void if_attachdomain(void *);
101 static void if_attachdomain1(struct ifnet *);
102 static int ifconf(u_long, caddr_t);
103 static void if_grow(void);
104 static void if_init(void *);
105 static void if_check(void *);
106 static void if_qflush(struct ifaltq *);
107 static void if_route(struct ifnet *, int flag, int fam);
108 static int if_setflag(struct ifnet *, int, int, int *, int);
109 static void if_slowtimo(void *);
110 static void if_unroute(struct ifnet *, int flag, int fam);
111 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
112 static int if_rtdel(struct radix_node *, void *);
113 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
114 static void if_start_deferred(void *context, int pending);
115 static void do_link_state_change(void *, int);
118 * XXX: declare here to avoid to include many inet6 related files..
119 * should be more generalized?
121 extern void nd6_setmtu(struct ifnet *);
125 struct ifindex_entry *ifindex_table = NULL;
126 int ifqmaxlen = IFQ_MAXLEN;
127 struct ifnethead ifnet; /* depend on static init XXX */
128 struct mtx ifnet_lock;
129 static if_com_alloc_t *if_com_alloc[256];
130 static if_com_free_t *if_com_free[256];
132 static int if_indexlim = 8;
133 static struct knlist ifklist;
135 static void filt_netdetach(struct knote *kn);
136 static int filt_netdev(struct knote *kn, long hint);
138 static struct filterops netdev_filtops =
139 { 1, NULL, filt_netdetach, filt_netdev };
142 * System initialization
144 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL)
145 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL)
147 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
148 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
149 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
151 static d_open_t netopen;
152 static d_close_t netclose;
153 static d_ioctl_t netioctl;
154 static d_kqfilter_t netkqfilter;
156 static struct cdevsw net_cdevsw = {
157 .d_version = D_VERSION,
158 .d_flags = D_NEEDGIANT,
163 .d_kqfilter = netkqfilter,
167 netopen(struct cdev *dev, int flag, int mode, struct thread *td)
173 netclose(struct cdev *dev, int flags, int fmt, struct thread *td)
179 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
184 /* only support interface specific ioctls */
185 if (IOCGROUP(cmd) != 'i')
190 * special network device, not interface.
192 if (cmd == SIOCGIFCONF)
193 return (ifconf(cmd, data)); /* XXX remove cmd */
195 if (cmd == SIOCGIFCONF32)
196 return (ifconf(cmd, data)); /* XXX remove cmd */
201 ifp = ifnet_byindex(idx);
205 error = ifhwioctl(cmd, ifp, data, td);
206 if (error == ENOIOCTL)
212 netkqfilter(struct cdev *dev, struct knote *kn)
214 struct knlist *klist;
218 switch (kn->kn_filter) {
220 kn->kn_fop = &netdev_filtops;
230 ifp = ifnet_byindex(idx);
233 klist = &ifp->if_klist;
236 kn->kn_hook = (caddr_t)klist;
238 knlist_add(klist, kn, 0);
244 filt_netdetach(struct knote *kn)
246 struct knlist *klist = (struct knlist *)kn->kn_hook;
248 knlist_remove(klist, kn, 0);
252 filt_netdev(struct knote *kn, long hint)
254 struct knlist *klist = (struct knlist *)kn->kn_hook;
257 * Currently NOTE_EXIT is abused to indicate device detach.
259 if (hint == NOTE_EXIT) {
260 kn->kn_data = NOTE_LINKINV;
261 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
262 knlist_remove_inevent(klist, kn);
266 kn->kn_data = hint; /* current status */
267 if (kn->kn_sfflags & hint)
268 kn->kn_fflags |= hint;
269 return (kn->kn_fflags != 0);
273 * Network interface utility routines.
275 * Routines with ifa_ifwith* names take sockaddr *'s as
280 if_init(void *dummy __unused)
285 knlist_init(&ifklist, NULL, NULL, NULL, NULL);
286 if_grow(); /* create initial table */
287 ifdev_byindex(0) = make_dev(&net_cdevsw, 0,
288 UID_ROOT, GID_WHEEL, 0600, "network");
296 struct ifindex_entry *e;
299 n = if_indexlim * sizeof(*e);
300 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
301 if (ifindex_table != NULL) {
302 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2);
303 free((caddr_t)ifindex_table, M_IFNET);
310 if_check(void *dummy __unused)
316 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */
317 TAILQ_FOREACH(ifp, &ifnet, if_link) {
318 if (ifp->if_snd.ifq_maxlen == 0) {
319 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
320 ifp->if_snd.ifq_maxlen = ifqmaxlen;
322 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) {
324 "XXX: driver didn't initialize queue mtx\n");
325 mtx_init(&ifp->if_snd.ifq_mtx, "unknown",
326 MTX_NETWORK_LOCK, MTX_DEF);
335 * Allocate a struct ifnet and in index for an interface.
338 if_alloc(u_char type)
342 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
345 * Try to find an empty slot below if_index. If we fail, take
348 * XXX: should be locked!
350 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) {
351 if (ifnet_byindex(ifp->if_index) == NULL)
354 /* Catch if_index overflow. */
355 if (ifp->if_index < 1) {
359 if (ifp->if_index > if_index)
360 if_index = ifp->if_index;
361 if (if_index >= if_indexlim)
363 ifnet_byindex(ifp->if_index) = ifp;
367 if (if_com_alloc[type] != NULL) {
368 ifp->if_l2com = if_com_alloc[type](type, ifp);
369 if (ifp->if_l2com == NULL) {
374 IF_ADDR_LOCK_INIT(ifp);
380 if_free(struct ifnet *ifp)
383 /* Do not add code to this function! Add it to if_free_type(). */
384 if_free_type(ifp, ifp->if_type);
388 if_free_type(struct ifnet *ifp, u_char type)
391 if (ifp != ifnet_byindex(ifp->if_index)) {
392 if_printf(ifp, "%s: value was not if_alloced, skipping\n",
397 IF_ADDR_LOCK_DESTROY(ifp);
399 ifnet_byindex(ifp->if_index) = NULL;
401 /* XXX: should be locked with if_findindex() */
402 while (if_index > 0 && ifnet_byindex(if_index) == NULL)
405 if (if_com_free[type] != NULL)
406 if_com_free[type](ifp->if_l2com, type);
412 * Attach an interface to the
413 * list of "active" interfaces.
416 if_attach(struct ifnet *ifp)
418 unsigned socksize, ifasize;
419 int namelen, masklen;
420 struct sockaddr_dl *sdl;
423 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
424 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
427 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp);
428 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
429 IF_AFDATA_LOCK_INIT(ifp);
430 ifp->if_afdata_initialized = 0;
432 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
436 * The old code would work if the interface passed a pre-existing
437 * chain of ifaddrs to this code. We don't trust our callers to
438 * properly initialize the tailq, however, so we no longer allow
439 * this unlikely case.
441 TAILQ_INIT(&ifp->if_addrhead);
442 TAILQ_INIT(&ifp->if_prefixhead);
443 TAILQ_INIT(&ifp->if_multiaddrs);
444 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL);
445 getmicrotime(&ifp->if_lastchange);
446 ifp->if_data.ifi_epoch = time_uptime;
447 ifp->if_data.ifi_datalen = sizeof(struct if_data);
451 mac_create_ifnet(ifp);
454 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw,
455 unit2minor(ifp->if_index),
456 UID_ROOT, GID_WHEEL, 0600, "%s/%s",
457 net_cdevsw.d_name, ifp->if_xname);
458 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d",
459 net_cdevsw.d_name, ifp->if_index);
461 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
464 * create a Link Level name for this device
466 namelen = strlen(ifp->if_xname);
468 * Always save enough space for any possiable name so we can do
469 * a rename in place later.
471 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
472 socksize = masklen + ifp->if_addrlen;
473 if (socksize < sizeof(*sdl))
474 socksize = sizeof(*sdl);
475 socksize = roundup2(socksize, sizeof(long));
476 ifasize = sizeof(*ifa) + 2 * socksize;
477 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
479 sdl = (struct sockaddr_dl *)(ifa + 1);
480 sdl->sdl_len = socksize;
481 sdl->sdl_family = AF_LINK;
482 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
483 sdl->sdl_nlen = namelen;
484 sdl->sdl_index = ifp->if_index;
485 sdl->sdl_type = ifp->if_type;
488 ifa->ifa_rtrequest = link_rtrequest;
489 ifa->ifa_addr = (struct sockaddr *)sdl;
490 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
491 ifa->ifa_netmask = (struct sockaddr *)sdl;
492 sdl->sdl_len = masklen;
494 sdl->sdl_data[--namelen] = 0xff;
496 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
497 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */
498 ifp->if_snd.altq_type = 0;
499 ifp->if_snd.altq_disc = NULL;
500 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE;
501 ifp->if_snd.altq_tbr = NULL;
502 ifp->if_snd.altq_ifp = ifp;
504 if (domain_init_status >= 2)
505 if_attachdomain1(ifp);
507 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
509 /* Announce the interface. */
510 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
514 if_attachdomain(void *dummy)
520 TAILQ_FOREACH(ifp, &ifnet, if_link)
521 if_attachdomain1(ifp);
524 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
525 if_attachdomain, NULL);
528 if_attachdomain1(struct ifnet *ifp)
536 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
537 * cannot lock ifp->if_afdata initialization, entirely.
539 if (IF_AFDATA_TRYLOCK(ifp) == 0) {
543 if (ifp->if_afdata_initialized >= domain_init_status) {
544 IF_AFDATA_UNLOCK(ifp);
546 printf("if_attachdomain called more than once on %s\n",
550 ifp->if_afdata_initialized = domain_init_status;
551 IF_AFDATA_UNLOCK(ifp);
553 /* address family dependent data region */
554 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
555 for (dp = domains; dp; dp = dp->dom_next) {
556 if (dp->dom_ifattach)
557 ifp->if_afdata[dp->dom_family] =
558 (*dp->dom_ifattach)(ifp);
565 * Remove any network addresses from an interface.
569 if_purgeaddrs(struct ifnet *ifp)
571 struct ifaddr *ifa, *next;
573 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
575 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_LINK)
578 /* XXX: Ugly!! ad hoc just for INET */
579 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
580 struct ifaliasreq ifr;
582 bzero(&ifr, sizeof(ifr));
583 ifr.ifra_addr = *ifa->ifa_addr;
584 if (ifa->ifa_dstaddr)
585 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
586 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
592 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
594 /* ifp_addrhead is already updated */
598 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
604 * Detach an interface, removing it from the
605 * list of "active" interfaces.
607 * XXXRW: There are some significant questions about event ordering, and
608 * how to prevent things from starting to use the interface during detach.
611 if_detach(struct ifnet *ifp)
614 struct radix_node_head *rnh;
622 * Remove/wait for pending events.
624 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
627 /* Maybe hook to the generalized departure handler above?!? */
633 * Remove routes and flush queues.
638 if (ALTQ_IS_ENABLED(&ifp->if_snd))
639 altq_disable(&ifp->if_snd);
640 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
641 altq_detach(&ifp->if_snd);
652 * Remove all IPv6 kernel structs related to ifp. This should be done
653 * before removing routing entries below, since IPv6 interface direct
654 * routes are expected to be removed by the IPv6-specific kernel API.
655 * Otherwise, the kernel will detect some inconsistency and bark it.
660 * Remove link ifaddr pointer and maybe decrement if_index.
661 * Clean up all addresses.
664 destroy_dev(ifdev_byindex(ifp->if_index));
665 ifdev_byindex(ifp->if_index) = NULL;
667 /* We can now free link ifaddr. */
668 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
669 ifa = TAILQ_FIRST(&ifp->if_addrhead);
670 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
675 * Delete all remaining routes using this interface
676 * Unfortuneatly the only way to do this is to slog through
677 * the entire routing table looking for routes which point
678 * to this interface...oh well...
680 for (i = 1; i <= AF_MAX; i++) {
681 if ((rnh = rt_tables[i]) == NULL)
683 RADIX_NODE_HEAD_LOCK(rnh);
684 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
685 RADIX_NODE_HEAD_UNLOCK(rnh);
688 /* Announce that the interface is gone. */
689 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
690 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
693 for (dp = domains; dp; dp = dp->dom_next) {
694 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
695 (*dp->dom_ifdetach)(ifp,
696 ifp->if_afdata[dp->dom_family]);
698 IF_AFDATA_UNLOCK(ifp);
701 mac_destroy_ifnet(ifp);
703 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT);
704 knlist_clear(&ifp->if_klist, 0);
705 knlist_destroy(&ifp->if_klist);
708 TAILQ_FOREACH(iter, &ifnet, if_link)
714 TAILQ_REMOVE(&ifnet, ifp, if_link);
716 mtx_destroy(&ifp->if_snd.ifq_mtx);
717 IF_AFDATA_DESTROY(ifp);
722 * Delete Routes for a Network Interface
724 * Called for each routing entry via the rnh->rnh_walktree() call above
725 * to delete all route entries referencing a detaching network interface.
728 * rn pointer to node in the routing table
729 * arg argument passed to rnh->rnh_walktree() - detaching interface
733 * errno failed - reason indicated
737 if_rtdel(struct radix_node *rn, void *arg)
739 struct rtentry *rt = (struct rtentry *)rn;
740 struct ifnet *ifp = arg;
743 if (rt->rt_ifp == ifp) {
746 * Protect (sorta) against walktree recursion problems
749 if ((rt->rt_flags & RTF_UP) == 0)
752 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
753 rt_mask(rt), rt->rt_flags,
754 (struct rtentry **) NULL);
756 log(LOG_WARNING, "if_rtdel: error %d\n", err);
763 #define sa_equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0)
766 * Locate an interface based on a complete address.
770 ifa_ifwithaddr(struct sockaddr *addr)
776 TAILQ_FOREACH(ifp, &ifnet, if_link)
777 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
778 if (ifa->ifa_addr->sa_family != addr->sa_family)
780 if (sa_equal(addr, ifa->ifa_addr))
782 /* IP6 doesn't have broadcast */
783 if ((ifp->if_flags & IFF_BROADCAST) &&
784 ifa->ifa_broadaddr &&
785 ifa->ifa_broadaddr->sa_len != 0 &&
786 sa_equal(ifa->ifa_broadaddr, addr))
796 * Locate the point to point interface with a given destination address.
800 ifa_ifwithdstaddr(struct sockaddr *addr)
806 TAILQ_FOREACH(ifp, &ifnet, if_link) {
807 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
809 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
810 if (ifa->ifa_addr->sa_family != addr->sa_family)
812 if (ifa->ifa_dstaddr &&
813 sa_equal(addr, ifa->ifa_dstaddr))
824 * Find an interface on a specific network. If many, choice
825 * is most specific found.
828 ifa_ifwithnet(struct sockaddr *addr)
832 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
833 u_int af = addr->sa_family;
834 char *addr_data = addr->sa_data, *cplim;
837 * AF_LINK addresses can be looked up directly by their index number,
838 * so do that if we can.
841 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
842 if (sdl->sdl_index && sdl->sdl_index <= if_index)
843 return (ifaddr_byindex(sdl->sdl_index));
847 * Scan though each interface, looking for ones that have
848 * addresses in this address family.
851 TAILQ_FOREACH(ifp, &ifnet, if_link) {
852 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
853 char *cp, *cp2, *cp3;
855 if (ifa->ifa_addr->sa_family != af)
857 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
859 * This is a bit broken as it doesn't
860 * take into account that the remote end may
861 * be a single node in the network we are
863 * The trouble is that we don't know the
864 * netmask for the remote end.
866 if (ifa->ifa_dstaddr != 0 &&
867 sa_equal(addr, ifa->ifa_dstaddr))
871 * if we have a special address handler,
872 * then use it instead of the generic one.
874 if (ifa->ifa_claim_addr) {
875 if ((*ifa->ifa_claim_addr)(ifa, addr))
881 * Scan all the bits in the ifa's address.
882 * If a bit dissagrees with what we are
883 * looking for, mask it with the netmask
884 * to see if it really matters.
887 if (ifa->ifa_netmask == 0)
890 cp2 = ifa->ifa_addr->sa_data;
891 cp3 = ifa->ifa_netmask->sa_data;
892 cplim = ifa->ifa_netmask->sa_len
893 + (char *)ifa->ifa_netmask;
895 if ((*cp++ ^ *cp2++) & *cp3++)
896 goto next; /* next address! */
898 * If the netmask of what we just found
899 * is more specific than what we had before
900 * (if we had one) then remember the new one
901 * before continuing to search
902 * for an even better one.
904 if (ifa_maybe == 0 ||
905 rn_refines((caddr_t)ifa->ifa_netmask,
906 (caddr_t)ifa_maybe->ifa_netmask))
918 * Find an interface address specific to an interface best matching
922 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
925 char *cp, *cp2, *cp3;
927 struct ifaddr *ifa_maybe = 0;
928 u_int af = addr->sa_family;
932 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
933 if (ifa->ifa_addr->sa_family != af)
937 if (ifa->ifa_netmask == 0) {
938 if (sa_equal(addr, ifa->ifa_addr) ||
940 sa_equal(addr, ifa->ifa_dstaddr)))
944 if (ifp->if_flags & IFF_POINTOPOINT) {
945 if (sa_equal(addr, ifa->ifa_dstaddr))
949 cp2 = ifa->ifa_addr->sa_data;
950 cp3 = ifa->ifa_netmask->sa_data;
951 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
952 for (; cp3 < cplim; cp3++)
953 if ((*cp++ ^ *cp2++) & *cp3)
964 #include <net/route.h>
967 * Default action when installing a route with a Link Level gateway.
968 * Lookup an appropriate real ifa to point to.
969 * This should be moved to /sys/net/link.c eventually.
972 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
974 struct ifaddr *ifa, *oifa;
975 struct sockaddr *dst;
980 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
981 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
983 ifa = ifaof_ifpforaddr(dst, ifp);
985 IFAREF(ifa); /* XXX */
989 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
990 ifa->ifa_rtrequest(cmd, rt, info);
995 * Mark an interface down and notify protocols of
997 * NOTE: must be called at splnet or eqivalent.
1000 if_unroute(struct ifnet *ifp, int flag, int fam)
1004 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
1006 ifp->if_flags &= ~flag;
1007 getmicrotime(&ifp->if_lastchange);
1008 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1009 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1010 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1011 if_qflush(&ifp->if_snd);
1014 carp_carpdev_state(ifp->if_carp);
1020 * Mark an interface up and notify protocols of
1022 * NOTE: must be called at splnet or eqivalent.
1025 if_route(struct ifnet *ifp, int flag, int fam)
1029 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
1031 ifp->if_flags |= flag;
1032 getmicrotime(&ifp->if_lastchange);
1033 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1034 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1035 pfctlinput(PRC_IFUP, ifa->ifa_addr);
1038 carp_carpdev_state(ifp->if_carp);
1046 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */
1047 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
1050 * Handle a change in the interface link state. To avoid LORs
1051 * between driver lock and upper layer locks, as well as possible
1052 * recursions, we post event to taskqueue, and all job
1053 * is done in static do_link_state_change().
1056 if_link_state_change(struct ifnet *ifp, int link_state)
1058 /* Return if state hasn't changed. */
1059 if (ifp->if_link_state == link_state)
1062 ifp->if_link_state = link_state;
1064 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
1068 do_link_state_change(void *arg, int pending)
1070 struct ifnet *ifp = (struct ifnet *)arg;
1071 int link_state = ifp->if_link_state;
1074 /* Notify that the link state has changed. */
1076 if (link_state == LINK_STATE_UP)
1078 else if (link_state == LINK_STATE_DOWN)
1079 link = NOTE_LINKDOWN;
1081 link = NOTE_LINKINV;
1082 KNOTE_UNLOCKED(&ifp->if_klist, link);
1083 if (ifp->if_vlantrunk != NULL)
1084 (*vlan_link_state_p)(ifp, link);
1086 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
1087 IFP2AC(ifp)->ac_netgraph != NULL)
1088 (*ng_ether_link_state_p)(ifp, link_state);
1091 carp_carpdev_state(ifp->if_carp);
1093 if (ifp->if_bridge) {
1094 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!"));
1095 (*bstp_linkstate_p)(ifp, link_state);
1098 devctl_notify("IFNET", ifp->if_xname,
1099 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL);
1101 if_printf(ifp, "%d link states coalesced\n", pending);
1102 if (log_link_state_change)
1103 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
1104 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
1108 * Mark an interface down and notify protocols of
1110 * NOTE: must be called at splnet or eqivalent.
1113 if_down(struct ifnet *ifp)
1116 if_unroute(ifp, IFF_UP, AF_UNSPEC);
1120 * Mark an interface up and notify protocols of
1122 * NOTE: must be called at splnet or eqivalent.
1125 if_up(struct ifnet *ifp)
1128 if_route(ifp, IFF_UP, AF_UNSPEC);
1132 * Flush an interface queue.
1135 if_qflush(struct ifaltq *ifq)
1141 if (ALTQ_IS_ENABLED(ifq))
1145 while ((m = n) != 0) {
1156 * Handle interface watchdog timer routines. Called
1157 * from softclock, we decrement timers (if set) and
1158 * call the appropriate interface routine on expiration.
1160 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called
1161 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab
1162 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface.
1165 if_slowtimo(void *arg)
1171 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1172 if (ifp->if_timer == 0 || --ifp->if_timer)
1174 if (ifp->if_watchdog)
1175 (*ifp->if_watchdog)(ifp);
1179 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
1183 * Map interface name to
1184 * interface structure pointer.
1187 ifunit(const char *name)
1192 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1193 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
1201 * Hardware specific interface ioctls.
1204 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
1209 int new_flags, temp_flags;
1210 size_t namelen, onamelen;
1211 char new_name[IFNAMSIZ];
1213 struct sockaddr_dl *sdl;
1215 ifr = (struct ifreq *)data;
1218 ifr->ifr_index = ifp->if_index;
1222 temp_flags = ifp->if_flags | ifp->if_drv_flags;
1223 ifr->ifr_flags = temp_flags & 0xffff;
1224 ifr->ifr_flagshigh = temp_flags >> 16;
1228 ifr->ifr_reqcap = ifp->if_capabilities;
1229 ifr->ifr_curcap = ifp->if_capenable;
1234 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp);
1239 ifr->ifr_metric = ifp->if_metric;
1243 ifr->ifr_mtu = ifp->if_mtu;
1247 ifr->ifr_phys = ifp->if_physical;
1255 * Currently, no driver owned flags pass the IFF_CANTCHANGE
1256 * check, so we don't need special handling here yet.
1258 new_flags = (ifr->ifr_flags & 0xffff) |
1259 (ifr->ifr_flagshigh << 16);
1260 if (ifp->if_flags & IFF_SMART) {
1261 /* Smart drivers twiddle their own routes */
1262 } else if (ifp->if_flags & IFF_UP &&
1263 (new_flags & IFF_UP) == 0) {
1267 } else if (new_flags & IFF_UP &&
1268 (ifp->if_flags & IFF_UP) == 0) {
1273 /* See if permanently promiscuous mode bit is about to flip */
1274 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
1275 if (new_flags & IFF_PPROMISC)
1276 ifp->if_flags |= IFF_PROMISC;
1277 else if (ifp->if_pcount == 0)
1278 ifp->if_flags &= ~IFF_PROMISC;
1279 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
1281 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
1283 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1284 (new_flags &~ IFF_CANTCHANGE);
1285 if (ifp->if_ioctl) {
1287 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1288 IFF_UNLOCKGIANT(ifp);
1290 getmicrotime(&ifp->if_lastchange);
1297 if (ifp->if_ioctl == NULL)
1298 return (EOPNOTSUPP);
1299 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1302 error = (*ifp->if_ioctl)(ifp, cmd, data);
1303 IFF_UNLOCKGIANT(ifp);
1305 getmicrotime(&ifp->if_lastchange);
1310 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp);
1318 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1321 if (new_name[0] == '\0')
1323 if (ifunit(new_name) != NULL)
1326 /* Announce the departure of the interface. */
1327 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1328 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1330 log(LOG_INFO, "%s: changing name to '%s'\n",
1331 ifp->if_xname, new_name);
1333 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1336 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1337 namelen = strlen(new_name);
1338 onamelen = sdl->sdl_nlen;
1340 * Move the address if needed. This is safe because we
1341 * allocate space for a name of length IFNAMSIZ when we
1342 * create this in if_attach().
1344 if (namelen != onamelen) {
1345 bcopy(sdl->sdl_data + onamelen,
1346 sdl->sdl_data + namelen, sdl->sdl_alen);
1348 bcopy(new_name, sdl->sdl_data, namelen);
1349 sdl->sdl_nlen = namelen;
1350 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1351 bzero(sdl->sdl_data, onamelen);
1352 while (namelen != 0)
1353 sdl->sdl_data[--namelen] = 0xff;
1356 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
1357 /* Announce the return of the interface. */
1358 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1365 ifp->if_metric = ifr->ifr_metric;
1366 getmicrotime(&ifp->if_lastchange);
1373 if (ifp->if_ioctl == NULL)
1374 return (EOPNOTSUPP);
1376 error = (*ifp->if_ioctl)(ifp, cmd, data);
1377 IFF_UNLOCKGIANT(ifp);
1379 getmicrotime(&ifp->if_lastchange);
1384 u_long oldmtu = ifp->if_mtu;
1389 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1391 if (ifp->if_ioctl == NULL)
1392 return (EOPNOTSUPP);
1394 error = (*ifp->if_ioctl)(ifp, cmd, data);
1395 IFF_UNLOCKGIANT(ifp);
1397 getmicrotime(&ifp->if_lastchange);
1401 * If the link MTU changed, do network layer specific procedure.
1403 if (ifp->if_mtu != oldmtu) {
1417 /* Don't allow group membership on non-multicast interfaces. */
1418 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1419 return (EOPNOTSUPP);
1421 /* Don't let users screw up protocols' entries. */
1422 if (ifr->ifr_addr.sa_family != AF_LINK)
1425 if (cmd == SIOCADDMULTI) {
1426 struct ifmultiaddr *ifma;
1427 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1429 error = if_delmulti(ifp, &ifr->ifr_addr);
1432 getmicrotime(&ifp->if_lastchange);
1435 case SIOCSIFPHYADDR:
1436 case SIOCDIFPHYADDR:
1438 case SIOCSIFPHYADDR_IN6:
1440 case SIOCSLIFPHYADDR:
1442 case SIOCSIFGENERIC:
1446 if (ifp->if_ioctl == NULL)
1447 return (EOPNOTSUPP);
1449 error = (*ifp->if_ioctl)(ifp, cmd, data);
1450 IFF_UNLOCKGIANT(ifp);
1452 getmicrotime(&ifp->if_lastchange);
1456 ifs = (struct ifstat *)data;
1457 ifs->ascii[0] = '\0';
1459 case SIOCGIFPSRCADDR:
1460 case SIOCGIFPDSTADDR:
1461 case SIOCGLIFPHYADDR:
1463 case SIOCGIFGENERIC:
1464 if (ifp->if_ioctl == NULL)
1465 return (EOPNOTSUPP);
1467 error = (*ifp->if_ioctl)(ifp, cmd, data);
1468 IFF_UNLOCKGIANT(ifp);
1475 error = if_setlladdr(ifp,
1476 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1490 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
1503 return (ifconf(cmd, data));
1505 ifr = (struct ifreq *)data;
1510 if ((error = suser(td)) != 0)
1512 return ((cmd == SIOCIFCREATE) ?
1513 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1514 if_clone_destroy(ifr->ifr_name));
1516 case SIOCIFGCLONERS:
1517 return (if_clone_list((struct if_clonereq *)data));
1520 ifp = ifunit(ifr->ifr_name);
1524 error = ifhwioctl(cmd, ifp, data, td);
1525 if (error != ENOIOCTL)
1528 oif_flags = ifp->if_flags;
1529 if (so->so_proto == 0)
1530 return (EOPNOTSUPP);
1532 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
1541 case SIOCSIFDSTADDR:
1543 case SIOCSIFBRDADDR:
1544 case SIOCSIFNETMASK:
1545 #if BYTE_ORDER != BIG_ENDIAN
1546 if (ifr->ifr_addr.sa_family == 0 &&
1547 ifr->ifr_addr.sa_len < 16) {
1548 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1549 ifr->ifr_addr.sa_len = 16;
1552 if (ifr->ifr_addr.sa_len == 0)
1553 ifr->ifr_addr.sa_len = 16;
1561 case OSIOCGIFDSTADDR:
1562 cmd = SIOCGIFDSTADDR;
1565 case OSIOCGIFBRDADDR:
1566 cmd = SIOCGIFBRDADDR;
1569 case OSIOCGIFNETMASK:
1570 cmd = SIOCGIFNETMASK;
1572 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
1579 case OSIOCGIFDSTADDR:
1580 case OSIOCGIFBRDADDR:
1581 case OSIOCGIFNETMASK:
1582 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1586 #endif /* COMPAT_43 */
1588 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1590 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1591 if (ifp->if_flags & IFF_UP) {
1602 * The code common to handling reference counted flags,
1603 * e.g., in ifpromisc() and if_allmulti().
1604 * The "pflag" argument can specify a permanent mode flag to check,
1605 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
1607 * Only to be used on stack-owned flags, not driver-owned flags.
1610 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
1614 int oldflags, oldcount;
1616 /* Sanity checks to catch programming errors */
1617 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
1618 ("%s: setting driver-owned flag %d", __func__, flag));
1621 KASSERT(*refcount >= 0,
1622 ("%s: increment negative refcount %d for flag %d",
1623 __func__, *refcount, flag));
1625 KASSERT(*refcount > 0,
1626 ("%s: decrement non-positive refcount %d for flag %d",
1627 __func__, *refcount, flag));
1629 /* In case this mode is permanent, just touch refcount */
1630 if (ifp->if_flags & pflag) {
1631 *refcount += onswitch ? 1 : -1;
1635 /* Save ifnet parameters for if_ioctl() may fail */
1636 oldcount = *refcount;
1637 oldflags = ifp->if_flags;
1640 * See if we aren't the only and touching refcount is enough.
1641 * Actually toggle interface flag if we are the first or last.
1646 ifp->if_flags |= flag;
1650 ifp->if_flags &= ~flag;
1653 /* Call down the driver since we've changed interface flags */
1654 if (ifp->if_ioctl == NULL) {
1658 ifr.ifr_flags = ifp->if_flags & 0xffff;
1659 ifr.ifr_flagshigh = ifp->if_flags >> 16;
1661 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1662 IFF_UNLOCKGIANT(ifp);
1665 /* Notify userland that interface flags have changed */
1670 /* Recover after driver error */
1671 *refcount = oldcount;
1672 ifp->if_flags = oldflags;
1677 * Set/clear promiscuous mode on interface ifp based on the truth value
1678 * of pswitch. The calls are reference counted so that only the first
1679 * "on" request actually has an effect, as does the final "off" request.
1680 * Results are undefined if the "off" and "on" requests are not matched.
1683 ifpromisc(struct ifnet *ifp, int pswitch)
1686 int oldflags = ifp->if_flags;
1688 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
1689 &ifp->if_pcount, pswitch);
1690 /* If promiscuous mode status has changed, log a message */
1691 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
1692 log(LOG_INFO, "%s: promiscuous mode %s\n",
1694 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
1699 * Return interface configuration
1700 * of system. List may be used
1701 * in later ioctl's (above) to get
1702 * other information.
1706 ifconf(u_long cmd, caddr_t data)
1708 struct ifconf *ifc = (struct ifconf *)data;
1710 struct ifconf32 *ifc32 = (struct ifconf32 *)data;
1711 struct ifconf ifc_swab;
1717 int error, full = 0, valid_len, max_len;
1720 if (cmd == SIOCGIFCONF32) {
1721 ifc_swab.ifc_len = ifc32->ifc_len;
1722 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf;
1726 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
1727 max_len = MAXPHYS - 1;
1729 /* Prevent hostile input from being able to crash the system */
1730 if (ifc->ifc_len <= 0)
1734 if (ifc->ifc_len <= max_len) {
1735 max_len = ifc->ifc_len;
1738 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
1742 IFNET_RLOCK(); /* could sleep XXX */
1743 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1747 * Zero the ifr_name buffer to make sure we don't
1748 * disclose the contents of the stack.
1750 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
1752 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1753 >= sizeof(ifr.ifr_name)) {
1756 return (ENAMETOOLONG);
1760 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1761 struct sockaddr *sa = ifa->ifa_addr;
1763 if (jailed(curthread->td_ucred) &&
1764 prison_if(curthread->td_ucred, sa))
1768 if (cmd == OSIOCGIFCONF) {
1769 struct osockaddr *osa =
1770 (struct osockaddr *)&ifr.ifr_addr;
1772 osa->sa_family = sa->sa_family;
1773 sbuf_bcat(sb, &ifr, sizeof(ifr));
1774 max_len += sizeof(ifr);
1777 if (sa->sa_len <= sizeof(*sa)) {
1779 sbuf_bcat(sb, &ifr, sizeof(ifr));
1780 max_len += sizeof(ifr);
1783 offsetof(struct ifreq, ifr_addr));
1784 max_len += offsetof(struct ifreq, ifr_addr);
1785 sbuf_bcat(sb, sa, sa->sa_len);
1786 max_len += sa->sa_len;
1789 if (!sbuf_overflowed(sb))
1790 valid_len = sbuf_len(sb);
1793 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
1794 sbuf_bcat(sb, &ifr, sizeof(ifr));
1795 max_len += sizeof(ifr);
1797 if (!sbuf_overflowed(sb))
1798 valid_len = sbuf_len(sb);
1804 * If we didn't allocate enough space (uncommon), try again. If
1805 * we have already allocated as much space as we are allowed,
1806 * return what we've got.
1808 if (valid_len != max_len && !full) {
1813 ifc->ifc_len = valid_len;
1815 if (cmd == SIOCGIFCONF32)
1816 ifc32->ifc_len = valid_len;
1819 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
1825 * Just like ifpromisc(), but for all-multicast-reception mode.
1828 if_allmulti(struct ifnet *ifp, int onswitch)
1831 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
1834 static struct ifmultiaddr *
1835 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
1837 struct ifmultiaddr *ifma;
1839 IF_ADDR_LOCK_ASSERT(ifp);
1841 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1842 if (sa_equal(ifma->ifma_addr, sa))
1850 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
1851 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
1852 * the ifnet multicast address list here, so the caller must do that and
1853 * other setup work (such as notifying the device driver). The reference
1854 * count is initialized to 1.
1856 static struct ifmultiaddr *
1857 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
1860 struct ifmultiaddr *ifma;
1861 struct sockaddr *dupsa;
1863 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags |
1868 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags);
1869 if (dupsa == NULL) {
1870 FREE(ifma, M_IFMADDR);
1873 bcopy(sa, dupsa, sa->sa_len);
1874 ifma->ifma_addr = dupsa;
1876 ifma->ifma_ifp = ifp;
1877 ifma->ifma_refcount = 1;
1878 ifma->ifma_protospec = NULL;
1881 ifma->ifma_lladdr = NULL;
1885 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags);
1886 if (dupsa == NULL) {
1887 FREE(ifma->ifma_addr, M_IFMADDR);
1888 FREE(ifma, M_IFMADDR);
1891 bcopy(llsa, dupsa, llsa->sa_len);
1892 ifma->ifma_lladdr = dupsa;
1898 * if_freemulti: free ifmultiaddr structure and possibly attached related
1899 * addresses. The caller is responsible for implementing reference
1900 * counting, notifying the driver, handling routing messages, and releasing
1901 * any dependent link layer state.
1904 if_freemulti(struct ifmultiaddr *ifma)
1907 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d",
1908 ifma->ifma_refcount));
1909 KASSERT(ifma->ifma_protospec == NULL,
1910 ("if_freemulti: protospec not NULL"));
1912 if (ifma->ifma_lladdr != NULL)
1913 FREE(ifma->ifma_lladdr, M_IFMADDR);
1914 FREE(ifma->ifma_addr, M_IFMADDR);
1915 FREE(ifma, M_IFMADDR);
1919 * Register an additional multicast address with a network interface.
1921 * - If the address is already present, bump the reference count on the
1922 * address and return.
1923 * - If the address is not link-layer, look up a link layer address.
1924 * - Allocate address structures for one or both addresses, and attach to the
1925 * multicast address list on the interface. If automatically adding a link
1926 * layer address, the protocol address will own a reference to the link
1927 * layer address, to be freed when it is freed.
1928 * - Notify the network device driver of an addition to the multicast address
1931 * 'sa' points to caller-owned memory with the desired multicast address.
1933 * 'retifma' will be used to return a pointer to the resulting multicast
1934 * address reference, if desired.
1937 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
1938 struct ifmultiaddr **retifma)
1940 struct ifmultiaddr *ifma, *ll_ifma;
1941 struct sockaddr *llsa;
1945 * If the address is already present, return a new reference to it;
1946 * otherwise, allocate storage and set up a new address.
1949 ifma = if_findmulti(ifp, sa);
1951 ifma->ifma_refcount++;
1952 if (retifma != NULL)
1954 IF_ADDR_UNLOCK(ifp);
1959 * The address isn't already present; resolve the protocol address
1960 * into a link layer address, and then look that up, bump its
1961 * refcount or allocate an ifma for that also. If 'llsa' was
1962 * returned, we will need to free it later.
1966 if (ifp->if_resolvemulti != NULL) {
1967 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1973 * Allocate the new address. Don't hook it up yet, as we may also
1974 * need to allocate a link layer multicast address.
1976 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
1983 * If a link layer address is found, we'll need to see if it's
1984 * already present in the address list, or allocate is as well.
1985 * When this block finishes, the link layer address will be on the
1989 ll_ifma = if_findmulti(ifp, llsa);
1990 if (ll_ifma == NULL) {
1991 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
1992 if (ll_ifma == NULL) {
1997 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
2000 ll_ifma->ifma_refcount++;
2004 * We now have a new multicast address, ifma, and possibly a new or
2005 * referenced link layer address. Add the primary address to the
2006 * ifnet address list.
2008 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
2010 if (retifma != NULL)
2014 * Must generate the message while holding the lock so that 'ifma'
2015 * pointer is still valid.
2017 * XXXRW: How come we don't announce ll_ifma?
2019 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
2020 IF_ADDR_UNLOCK(ifp);
2023 * We are certain we have added something, so call down to the
2024 * interface to let them know about it.
2026 if (ifp->if_ioctl != NULL) {
2028 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
2029 IFF_UNLOCKGIANT(ifp);
2033 FREE(llsa, M_IFMADDR);
2039 FREE(llsa, M_IFMADDR);
2042 IF_ADDR_UNLOCK(ifp);
2047 * Remove a reference to a multicast address on this interface. Yell
2048 * if the request does not match an existing membership.
2051 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
2053 struct ifmultiaddr *ifma, *ll_ifma;
2056 ifma = if_findmulti(ifp, sa);
2058 IF_ADDR_UNLOCK(ifp);
2062 if (ifma->ifma_refcount > 1) {
2063 ifma->ifma_refcount--;
2064 IF_ADDR_UNLOCK(ifp);
2068 sa = ifma->ifma_lladdr;
2070 ll_ifma = if_findmulti(ifp, sa);
2075 * XXXRW: How come we don't announce ll_ifma?
2077 rt_newmaddrmsg(RTM_DELMADDR, ifma);
2079 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
2082 if (ll_ifma != NULL) {
2083 if (ll_ifma->ifma_refcount == 1) {
2084 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link);
2085 if_freemulti(ll_ifma);
2087 ll_ifma->ifma_refcount--;
2089 IF_ADDR_UNLOCK(ifp);
2092 * Make sure the interface driver is notified
2093 * in the case of a link layer mcast group being left.
2095 if (ifp->if_ioctl) {
2097 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
2098 IFF_UNLOCKGIANT(ifp);
2105 * Set the link layer address on an interface.
2107 * At this time we only support certain types of interfaces,
2108 * and we don't allow the length of the address to change.
2111 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
2113 struct sockaddr_dl *sdl;
2120 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2123 if (len != sdl->sdl_alen) /* don't allow length to change */
2125 switch (ifp->if_type) {
2133 bcopy(lladdr, LLADDR(sdl), len);
2139 * If the interface is already up, we need
2140 * to re-init it in order to reprogram its
2143 if ((ifp->if_flags & IFF_UP) != 0) {
2144 if (ifp->if_ioctl) {
2146 ifp->if_flags &= ~IFF_UP;
2147 ifr.ifr_flags = ifp->if_flags & 0xffff;
2148 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2149 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2150 ifp->if_flags |= IFF_UP;
2151 ifr.ifr_flags = ifp->if_flags & 0xffff;
2152 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2153 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2154 IFF_UNLOCKGIANT(ifp);
2158 * Also send gratuitous ARPs to notify other nodes about
2159 * the address change.
2161 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2162 if (ifa->ifa_addr != NULL &&
2163 ifa->ifa_addr->sa_family == AF_INET)
2164 arp_ifinit(ifp, ifa);
2172 * The name argument must be a pointer to storage which will last as
2173 * long as the interface does. For physical devices, the result of
2174 * device_get_name(dev) is a good choice and for pseudo-devices a
2175 * static string works well.
2178 if_initname(struct ifnet *ifp, const char *name, int unit)
2180 ifp->if_dname = name;
2181 ifp->if_dunit = unit;
2182 if (unit != IF_DUNIT_NONE)
2183 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
2185 strlcpy(ifp->if_xname, name, IFNAMSIZ);
2189 if_printf(struct ifnet *ifp, const char * fmt, ...)
2194 retval = printf("%s: ", ifp->if_xname);
2196 retval += vprintf(fmt, ap);
2202 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot
2203 * be called without Giant. However, we often can't acquire the Giant lock
2204 * at those points; instead, we run it via a task queue that holds Giant via
2205 * if_start_deferred.
2207 * XXXRW: We need to make sure that the ifnet isn't fully detached until any
2208 * outstanding if_start_deferred() tasks that will run after the free. This
2209 * probably means waiting in if_detach().
2212 if_start(struct ifnet *ifp)
2217 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) {
2218 if (mtx_owned(&Giant))
2219 (*(ifp)->if_start)(ifp);
2221 taskqueue_enqueue(taskqueue_swi_giant,
2222 &ifp->if_starttask);
2224 (*(ifp)->if_start)(ifp);
2228 if_start_deferred(void *context, int pending)
2233 * This code must be entered with Giant, and should never run if
2234 * we're not running with debug.mpsafenet.
2236 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet"));
2240 (ifp->if_start)(ifp);
2244 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
2249 if (_IF_QFULL(ifq)) {
2256 ifp->if_obytes += m->m_pkthdr.len + adjust;
2257 if (m->m_flags & (M_BCAST|M_MCAST))
2259 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
2261 _IF_ENQUEUE(ifq, m);
2263 if (ifp != NULL && !active)
2269 if_register_com_alloc(u_char type,
2270 if_com_alloc_t *a, if_com_free_t *f)
2273 KASSERT(if_com_alloc[type] == NULL,
2274 ("if_register_com_alloc: %d already registered", type));
2275 KASSERT(if_com_free[type] == NULL,
2276 ("if_register_com_alloc: %d free already registered", type));
2278 if_com_alloc[type] = a;
2279 if_com_free[type] = f;
2283 if_deregister_com_alloc(u_char type)
2286 KASSERT(if_com_alloc[type] == NULL,
2287 ("if_deregister_com_alloc: %d not registered", type));
2288 KASSERT(if_com_free[type] == NULL,
2289 ("if_deregister_com_alloc: %d free not registered", type));
2290 if_com_alloc[type] = NULL;
2291 if_com_free[type] = NULL;