2 * Copyright (c) 1982, 1989, 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_ethersubr.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $
35 * $DragonFly: src/sys/net/if_ethersubr.c,v 1.20 2004/12/14 18:46:08 hsu Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
43 #include "opt_netgraph.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/sysctl.h>
55 #include <net/netisr.h>
56 #include <net/route.h>
57 #include <net/if_llc.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
61 #include <net/ethernet.h>
62 #include <net/bridge/bridge.h>
64 #if defined(INET) || defined(INET6)
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/if_ether.h>
68 #include <net/ipfw/ip_fw.h>
69 #include <net/dummynet/ip_dummynet.h>
72 #include <netinet6/nd6.h>
76 #include <netproto/ipx/ipx.h>
77 #include <netproto/ipx/ipx_if.h>
78 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
79 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
80 struct sockaddr *dst, short *tp, int *hlen);
85 #include <netns/ns_if.h>
87 int ether_outputdebug = 0;
88 int ether_inputdebug = 0;
92 #include <netproto/atalk/at.h>
93 #include <netproto/atalk/at_var.h>
94 #include <netproto/atalk/at_extern.h>
96 #define llc_snap_org_code llc_un.type_snap.org_code
97 #define llc_snap_ether_type llc_un.type_snap.ether_type
99 extern u_char at_org_code[3];
100 extern u_char aarp_org_code[3];
101 #endif /* NETATALK */
103 /* netgraph node hooks for ng_ether(4) */
104 void (*ng_ether_input_p)(struct ifnet *ifp,
105 struct mbuf **mp, struct ether_header *eh);
106 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
107 struct mbuf *m, struct ether_header *eh);
108 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
109 void (*ng_ether_attach_p)(struct ifnet *ifp);
110 void (*ng_ether_detach_p)(struct ifnet *ifp);
112 int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m);
113 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t);
115 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
120 bridge_in_t *bridge_in_ptr;
121 bdg_forward_t *bdg_forward_ptr;
122 bdgtakeifaces_t *bdgtakeifaces_ptr;
123 struct bdg_softc *ifp2sc;
125 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
127 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
128 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
131 #define senderr(e) do { error = (e); goto bad;} while (0)
132 #define IFP2AC(IFP) ((struct arpcom *)IFP)
135 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
136 struct ip_fw **rule, struct ether_header *eh, int shared);
137 static int ether_ipfw;
140 * Ethernet output routine.
141 * Encapsulate a packet of type family for the local net.
142 * Use trailer local net encapsulation if enough data in first
143 * packet leaves a multiple of 512 bytes of data in remainder.
144 * Assumes that ifp is actually pointer to arpcom structure.
147 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
151 int error = 0, hdrcmplt = 0;
152 u_char esrc[6], edst[6];
154 struct ether_header *eh;
156 int hlen; /* link layer header lenght */
157 struct arpcom *ac = IFP2AC(ifp);
159 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
163 if ((rt->rt_flags & RTF_UP) == 0) {
164 rt0 = rt = rtalloc1(dst, 1, 0UL);
168 senderr(EHOSTUNREACH);
170 if (rt->rt_flags & RTF_GATEWAY) {
171 if (rt->rt_gwroute == 0)
173 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
174 rtfree(rt); rt = rt0;
175 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
177 if ((rt = rt->rt_gwroute) == 0)
178 senderr(EHOSTUNREACH);
181 if (rt->rt_flags & RTF_REJECT)
182 if (rt->rt_rmx.rmx_expire == 0 ||
183 time_second < rt->rt_rmx.rmx_expire)
184 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
186 hlen = ETHER_HDR_LEN;
187 switch (dst->sa_family) {
190 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
191 return (0); /* if not yet resolved */
192 type = htons(ETHERTYPE_IP);
197 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
198 /* Something bad happened */
201 type = htons(ETHERTYPE_IPV6);
207 error = ef_outputp(ifp, &m, dst, &type, &hlen);
211 type = htons(ETHERTYPE_IPX);
212 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
213 (caddr_t)edst, sizeof (edst));
219 struct at_ifaddr *aa;
221 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
224 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
227 * In the phase 2 case, need to prepend an mbuf for the llc header.
228 * Since we must preserve the value of m, which is passed to us by
229 * value, we m_copy() the first mbuf, and use it for our llc header.
231 if ( aa->aa_flags & AFA_PHASE2 ) {
234 M_PREPEND(m, sizeof(struct llc), MB_WAIT);
235 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
236 llc.llc_control = LLC_UI;
237 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
238 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
239 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
240 type = htons(m->m_pkthdr.len);
241 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
243 type = htons(ETHERTYPE_AT);
247 #endif /* NETATALK */
252 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
255 case 0x0: /* Novell 802.3 */
256 type = htons( m->m_pkthdr.len);
258 case 0xe0e0: /* Novell 802.2 and Token-Ring */
259 M_PREPEND(m, 3, MB_WAIT);
260 type = htons( m->m_pkthdr.len);
261 cp = mtod(m, u_char *);
267 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
268 (caddr_t)edst, sizeof (edst));
270 * XXX if ns_thishost is the same as the node's ethernet
271 * address then just the default code will catch this anyhow.
272 * So I'm not sure if this next clause should be here at all?
275 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){
276 m->m_pkthdr.rcvif = ifp;
277 netisr_dispatch(NETISR_NS, m);
280 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){
281 m->m_flags |= M_BCAST;
286 case pseudo_AF_HDRCMPLT:
288 eh = (struct ether_header *)dst->sa_data;
289 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
293 loop_copy = -1; /* if this is for us, don't do it */
294 eh = (struct ether_header *)dst->sa_data;
295 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
296 type = eh->ether_type;
300 printf("%s: can't handle af%d\n", ifp->if_xname,
302 senderr(EAFNOSUPPORT);
306 * Add local net header. If no space in first mbuf,
309 M_PREPEND(m, sizeof (struct ether_header), MB_DONTWAIT);
312 eh = mtod(m, struct ether_header *);
313 (void)memcpy(&eh->ether_type, &type,
314 sizeof(eh->ether_type));
315 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
317 (void)memcpy(eh->ether_shost, esrc,
318 sizeof(eh->ether_shost));
320 (void)memcpy(eh->ether_shost, ac->ac_enaddr,
321 sizeof(eh->ether_shost));
324 * If a simplex interface, and the packet is being sent to our
325 * Ethernet address or a broadcast address, loopback a copy.
326 * XXX To make a simplex device behave exactly like a duplex
327 * device, we should copy in the case of sending to our own
328 * ethernet address (thus letting the original actually appear
329 * on the wire). However, we don't do that here for security
330 * reasons and compatibility with the original behavior.
332 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
335 if (m->m_pkthdr.csum_flags & CSUM_IP)
336 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
337 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
338 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
339 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
342 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
343 n->m_pkthdr.csum_flags |= csum_flags;
344 if (csum_flags & CSUM_DATA_VALID)
345 n->m_pkthdr.csum_data = 0xffff;
346 (void)if_simloop(ifp, n, dst->sa_family, hlen);
349 } else if (bcmp(eh->ether_dhost,
350 eh->ether_shost, ETHER_ADDR_LEN) == 0) {
351 m->m_pkthdr.csum_flags |= csum_flags;
352 if (csum_flags & CSUM_DATA_VALID)
353 m->m_pkthdr.csum_data = 0xffff;
354 (void) if_simloop(ifp, m, dst->sa_family, hlen);
355 return (0); /* XXX */
359 /* Handle ng_ether(4) processing, if any */
360 if (ng_ether_output_p != NULL) {
361 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
370 /* Continue with link-layer output */
371 return ether_output_frame(ifp, m);
375 * Ethernet link layer output routine to send a raw frame to the device.
377 * This assumes that the 14 byte Ethernet header is present and contiguous
378 * in the first mbuf (if BRIDGE'ing).
381 ether_output_frame(ifp, m)
387 struct ip_fw *rule = NULL;
389 /* Extract info from dummynet tag, ignore others */
390 for (; m->m_type == MT_TAG; m = m->m_next)
391 if (m->m_flags == PACKET_TAG_DUMMYNET)
392 rule = ((struct dn_pkt *)m)->rule;
394 if (rule) /* packet was already bridged */
397 if (BDG_ACTIVE(ifp) ) {
398 struct ether_header *eh; /* a ptr suffices */
400 m->m_pkthdr.rcvif = NULL;
401 eh = mtod(m, struct ether_header *);
402 m_adj(m, ETHER_HDR_LEN);
403 m = bdg_forward_ptr(m, eh, ifp);
411 if (IPFW_LOADED && ether_ipfw != 0) {
412 struct ether_header save_eh, *eh;
414 eh = mtod(m, struct ether_header *);
416 m_adj(m, ETHER_HDR_LEN);
417 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) {
420 return ENOBUFS; /* pkt dropped */
422 return 0; /* consumed e.g. in a pipe */
424 /* packet was ok, restore the ethernet header */
425 if ( (void *)(eh + 1) == (void *)m->m_data) {
426 m->m_data -= ETHER_HDR_LEN ;
427 m->m_len += ETHER_HDR_LEN ;
428 m->m_pkthdr.len += ETHER_HDR_LEN ;
430 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
431 if (m == NULL) /* nope... */
433 bcopy(&save_eh, mtod(m, struct ether_header *),
439 * Queue message on interface, update output statistics if
440 * successful, and start output if interface not yet active.
442 if (!IF_HANDOFF(&ifp->if_snd, m, ifp))
449 * ipfw processing for ethernet packets (in and out).
450 * The second parameter is NULL from ether_demux, and ifp from
451 * ether_output_frame. This section of code could be used from
452 * bridge.c as well as long as we use some extra info
453 * to distinguish that case from ether_output_frame();
456 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
457 struct ip_fw **rule, struct ether_header *eh, int shared)
459 struct ether_header save_eh = *eh; /* might be a ptr in m */
461 struct ip_fw_args args;
463 if (*rule != NULL && fw_one_pass)
464 return 1; /* dummynet packet, already partially processed */
467 * I need some amt of data to be contiguous, and in case others need
468 * the packet (shared==1) also better be in the first mbuf.
470 i = min( (*m0)->m_pkthdr.len, max_protohdr);
471 if ( shared || (*m0)->m_len < i) {
472 *m0 = m_pullup(*m0, i);
477 args.m = *m0; /* the packet we are looking at */
478 args.oif = dst; /* destination, if any */
479 args.divert_rule = 0; /* we do not support divert yet */
480 args.rule = *rule; /* matching rule to restart */
481 args.next_hop = NULL; /* we do not support forward yet */
482 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
483 i = ip_fw_chk_ptr(&args);
487 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
490 if (i == 0) /* a PASS rule. */
493 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
495 * Pass the pkt to dummynet, which consumes it.
496 * If shared, make a copy and keep the original.
501 m = m_copypacket(*m0, MB_DONTWAIT);
505 m = *m0 ; /* pass the original to dummynet */
506 *m0 = NULL ; /* and nothing back to the caller */
509 * Prepend the header, optimize for the common case of
510 * eh pointing into the mbuf.
512 if ( (void *)(eh + 1) == (void *)m->m_data) {
513 m->m_data -= ETHER_HDR_LEN ;
514 m->m_len += ETHER_HDR_LEN ;
515 m->m_pkthdr.len += ETHER_HDR_LEN ;
517 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
518 if (m == NULL) /* nope... */
520 bcopy(&save_eh, mtod(m, struct ether_header *),
523 ip_dn_io_ptr(m, (i & 0xffff),
524 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
528 * XXX at some point add support for divert/forward actions.
529 * If none of the above matches, we have to drop the pkt.
535 * XXX merge this function with ether_input.
538 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
540 ether_input(ifp, NULL, m);
544 * Process a received Ethernet packet. We have two different interfaces:
545 * one (conventional) assumes the packet in the mbuf, with the ethernet
546 * header provided separately in *eh. The second one (new) has everything
547 * in the mbuf, and we can tell it because eh == NULL.
548 * The caller MUST MAKE SURE that there are at least
549 * sizeof(struct ether_header) bytes in the first mbuf.
551 * This allows us to concentrate in one place a bunch of code which
552 * is replicated in all device drivers. Also, many functions called
553 * from ether_input() try to put the eh back into the mbuf, so we
554 * can later propagate the 'contiguous packet' interface to them,
555 * and handle the old interface just here.
557 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or
558 * cluster, right before m_data. So be very careful when working on m,
559 * as you could destroy *eh !!
561 * First we perform any link layer operations, then continue
562 * to the upper layers with ether_demux().
565 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
567 struct ether_header save_eh;
570 if (m->m_len < sizeof(struct ether_header)) {
571 /* XXX error in the caller. */
575 m->m_pkthdr.rcvif = ifp;
576 eh = mtod(m, struct ether_header *);
577 m_adj(m, sizeof(struct ether_header));
579 /* m->m_pkthdr.len = m->m_len; */
582 /* Check for a BPF tap */
583 if (ifp->if_bpf != NULL) {
586 /* This kludge is OK; BPF treats the "mbuf" as read-only */
588 mh.mh_data = (char *)eh;
589 mh.mh_len = ETHER_HDR_LEN;
590 bpf_mtap(ifp, (struct mbuf *)&mh);
593 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
595 /* Handle ng_ether(4) processing, if any */
596 if (ng_ether_input_p != NULL) {
597 (*ng_ether_input_p)(ifp, &m, eh);
602 /* Check for bridging mode */
603 if (BDG_ACTIVE(ifp) ) {
606 /* Check with bridging code */
607 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) {
611 if (bif != BDG_LOCAL) {
612 save_eh = *eh ; /* because it might change */
613 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */
615 * Do not continue if bdg_forward_ptr() processed our
616 * packet (and cleared the mbuf pointer m) or if
617 * it dropped (m_free'd) the packet itself.
620 if (bif == BDG_BCAST || bif == BDG_MCAST)
621 printf("bdg_forward drop MULTICAST PKT\n");
629 goto recvLocal; /* receive locally */
631 /* If not local and not multicast, just drop it */
638 /* Continue with upper layer processing */
639 ether_demux(ifp, eh, m);
643 * Upper layer processing for a received Ethernet packet.
646 ether_demux(ifp, eh, m)
648 struct ether_header *eh;
653 #if defined(NETATALK)
656 struct ip_fw *rule = NULL;
658 /* Extract info from dummynet tag, ignore others */
659 for (;m->m_type == MT_TAG; m = m->m_next)
660 if (m->m_flags == PACKET_TAG_DUMMYNET) {
661 rule = ((struct dn_pkt *)m)->rule;
662 ifp = m->m_next->m_pkthdr.rcvif;
665 if (rule) /* packet was already bridged */
668 if (! (BDG_ACTIVE(ifp) ) )
669 /* Discard packet if upper layers shouldn't see it because it was
670 unicast to a different Ethernet address. If the driver is working
671 properly, then this situation can only happen when the interface
672 is in promiscuous mode. */
673 if ((ifp->if_flags & IFF_PROMISC) != 0
674 && (eh->ether_dhost[0] & 1) == 0
675 && bcmp(eh->ether_dhost,
676 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0
677 && (ifp->if_flags & IFF_PPROMISC) == 0) {
682 /* Discard packet if interface is not up */
683 if ((ifp->if_flags & IFF_UP) == 0) {
687 if (eh->ether_dhost[0] & 1) {
688 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
689 ifp->if_addrlen) == 0)
690 m->m_flags |= M_BCAST;
692 m->m_flags |= M_MCAST;
694 if (m->m_flags & (M_BCAST|M_MCAST))
698 if (IPFW_LOADED && ether_ipfw != 0) {
699 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) {
706 ether_type = ntohs(eh->ether_type);
708 switch (ether_type) {
711 if (ipflow_fastforward(m))
717 if (ifp->if_flags & IFF_NOARP) {
718 /* Discard packet if ARP is disabled on interface */
727 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
738 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
750 #endif /* NETATALK */
753 if (vlan_input_p != NULL)
754 (*vlan_input_p)(eh, m);
756 m->m_pkthdr.rcvif->if_noproto++;
763 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
767 checksum = mtod(m, ushort *);
769 if ((ether_type <= ETHERMTU) &&
770 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
771 if (*checksum == 0xE0E0) {
772 m->m_pkthdr.len -= 3;
781 if (ether_type > ETHERMTU)
783 l = mtod(m, struct llc *);
784 if (l->llc_dsap == LLC_SNAP_LSAP &&
785 l->llc_ssap == LLC_SNAP_LSAP &&
786 l->llc_control == LLC_UI) {
787 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
788 sizeof(at_org_code)) == 0 &&
789 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
790 m_adj(m, sizeof(struct llc));
794 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
795 sizeof(aarp_org_code)) == 0 &&
796 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
797 m_adj(m, sizeof(struct llc));
803 #endif /* NETATALK */
804 if (ng_ether_input_orphan_p != NULL)
805 (*ng_ether_input_orphan_p)(ifp, m, eh);
810 netisr_dispatch(isr, m);
814 * Perform common duties while attaching to interface list
818 ether_ifattach(struct ifnet *ifp, uint8_t *lla)
820 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header));
824 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen)
827 struct sockaddr_dl *sdl;
829 ifp->if_output = ether_output;
830 ifp->if_input = ether_input_internal;
831 ifp->if_type = IFT_ETHER;
832 ifp->if_addrlen = ETHER_ADDR_LEN;
833 ifp->if_broadcastaddr = etherbroadcastaddr;
836 ifp->if_mtu = ETHERMTU;
837 ifp->if_resolvemulti = ether_resolvemulti;
838 if (ifp->if_baudrate == 0)
839 ifp->if_baudrate = 10000000;
840 ifa = ifnet_addrs[ifp->if_index - 1];
841 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
842 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
843 sdl->sdl_type = IFT_ETHER;
844 sdl->sdl_alen = ifp->if_addrlen;
845 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
847 * XXX Keep the current drivers happy.
848 * XXX Remove once all drivers have been cleaned up
850 if (lla != IFP2AC(ifp)->ac_enaddr)
851 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
852 bpfattach(ifp, dlt, hdrlen);
853 if (ng_ether_attach_p != NULL)
854 (*ng_ether_attach_p)(ifp);
858 if_printf(ifp, "MAC address: %6D\n", lla, ":");
862 * Perform common duties while detaching an Ethernet interface
865 ether_ifdetach(struct ifnet *ifp)
873 if (ng_ether_detach_p != NULL)
874 (*ng_ether_detach_p)(ifp);
881 SYSCTL_DECL(_net_link);
882 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
883 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
884 ðer_ipfw,0,"Pass ether pkts through firewall");
887 ether_ioctl(ifp, command, data)
892 struct ifaddr *ifa = (struct ifaddr *) data;
893 struct ifreq *ifr = (struct ifreq *) data;
898 ifp->if_flags |= IFF_UP;
900 switch (ifa->ifa_addr->sa_family) {
903 ifp->if_init(ifp->if_softc); /* before arpwhohas */
904 arp_ifinit(ifp, ifa);
909 * XXX - This code is probably wrong
913 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
914 struct arpcom *ac = IFP2AC(ifp);
916 if (ipx_nullhost(*ina))
921 bcopy((caddr_t) ina->x_host.c_host,
922 (caddr_t) ac->ac_enaddr,
923 sizeof(ac->ac_enaddr));
929 ifp->if_init(ifp->if_softc);
935 * XXX - This code is probably wrong
939 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
940 struct arpcom *ac = IFP2AC(ifp);
942 if (ns_nullhost(*ina))
944 *(union ns_host *) (ac->ac_enaddr);
946 bcopy((caddr_t) ina->x_host.c_host,
947 (caddr_t) ac->ac_enaddr,
948 sizeof(ac->ac_enaddr));
954 ifp->if_init(ifp->if_softc);
959 ifp->if_init(ifp->if_softc);
968 sa = (struct sockaddr *) & ifr->ifr_data;
969 bcopy(IFP2AC(ifp)->ac_enaddr,
970 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
976 * Set the interface MTU.
978 if (ifr->ifr_mtu > ETHERMTU) {
981 ifp->if_mtu = ifr->ifr_mtu;
992 ether_resolvemulti(ifp, llsa, sa)
994 struct sockaddr **llsa;
997 struct sockaddr_dl *sdl;
998 struct sockaddr_in *sin;
1000 struct sockaddr_in6 *sin6;
1004 switch(sa->sa_family) {
1007 * No mapping needed. Just check that it's a valid MC address.
1009 sdl = (struct sockaddr_dl *)sa;
1010 e_addr = LLADDR(sdl);
1011 if ((e_addr[0] & 1) != 1)
1012 return EADDRNOTAVAIL;
1018 sin = (struct sockaddr_in *)sa;
1019 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1020 return EADDRNOTAVAIL;
1021 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1023 sdl->sdl_len = sizeof *sdl;
1024 sdl->sdl_family = AF_LINK;
1025 sdl->sdl_index = ifp->if_index;
1026 sdl->sdl_type = IFT_ETHER;
1027 sdl->sdl_alen = ETHER_ADDR_LEN;
1028 e_addr = LLADDR(sdl);
1029 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1030 *llsa = (struct sockaddr *)sdl;
1035 sin6 = (struct sockaddr_in6 *)sa;
1036 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1038 * An IP6 address of 0 means listen to all
1039 * of the Ethernet multicast address used for IP6.
1040 * (This is used for multicast routers.)
1042 ifp->if_flags |= IFF_ALLMULTI;
1046 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1047 return EADDRNOTAVAIL;
1048 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1050 sdl->sdl_len = sizeof *sdl;
1051 sdl->sdl_family = AF_LINK;
1052 sdl->sdl_index = ifp->if_index;
1053 sdl->sdl_type = IFT_ETHER;
1054 sdl->sdl_alen = ETHER_ADDR_LEN;
1055 e_addr = LLADDR(sdl);
1056 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1057 *llsa = (struct sockaddr *)sdl;
1063 * Well, the text isn't quite right, but it's the name
1066 return EAFNOSUPPORT;
1072 * This is for reference. We have a table-driven version
1073 * of the little-endian crc32 generator, which is faster
1074 * than the double-loop.
1077 ether_crc32_le(const uint8_t *buf, size_t len)
1079 uint32_t c, crc, carry;
1082 crc = 0xffffffffU; /* initial value */
1084 for (i = 0; i < len; i++) {
1086 for (j = 0; j < 8; j++) {
1087 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1091 crc = (crc ^ ETHER_CRC_POLY_LE);
1099 ether_crc32_le(const uint8_t *buf, size_t len)
1101 static const uint32_t crctab[] = {
1102 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1103 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1104 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1105 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1110 crc = 0xffffffffU; /* initial value */
1112 for (i = 0; i < len; i++) {
1114 crc = (crc >> 4) ^ crctab[crc & 0xf];
1115 crc = (crc >> 4) ^ crctab[crc & 0xf];
1123 ether_crc32_be(const uint8_t *buf, size_t len)
1125 uint32_t c, crc, carry;
1128 crc = 0xffffffffU; /* initial value */
1130 for (i = 0; i < len; i++) {
1132 for (j = 0; j < 8; j++) {
1133 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1137 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;