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 1.17 2004/07/17 09:43:05 joerg 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 ether_header *eh, struct mbuf *m,
118 bridge_in_t *bridge_in_ptr;
119 bdg_forward_t *bdg_forward_ptr;
120 bdgtakeifaces_t *bdgtakeifaces_ptr;
121 struct bdg_softc *ifp2sc;
123 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
125 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
126 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
129 #define senderr(e) do { error = (e); goto bad;} while (0)
130 #define IFP2AC(IFP) ((struct arpcom *)IFP)
133 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
134 struct ip_fw **rule, struct ether_header *eh, int shared);
135 static int ether_ipfw;
138 * Ethernet output routine.
139 * Encapsulate a packet of type family for the local net.
140 * Use trailer local net encapsulation if enough data in first
141 * packet leaves a multiple of 512 bytes of data in remainder.
142 * Assumes that ifp is actually pointer to arpcom structure.
145 ether_output(ifp, m, dst, rt0)
148 struct sockaddr *dst;
152 int error = 0, hdrcmplt = 0;
153 u_char esrc[6], edst[6];
155 struct ether_header *eh;
157 int hlen; /* link layer header lenght */
158 struct arpcom *ac = IFP2AC(ifp);
160 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
164 if ((rt->rt_flags & RTF_UP) == 0) {
165 rt0 = rt = rtalloc1(dst, 1, 0UL);
169 senderr(EHOSTUNREACH);
171 if (rt->rt_flags & RTF_GATEWAY) {
172 if (rt->rt_gwroute == 0)
174 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
175 rtfree(rt); rt = rt0;
176 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
178 if ((rt = rt->rt_gwroute) == 0)
179 senderr(EHOSTUNREACH);
182 if (rt->rt_flags & RTF_REJECT)
183 if (rt->rt_rmx.rmx_expire == 0 ||
184 time_second < rt->rt_rmx.rmx_expire)
185 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
187 hlen = ETHER_HDR_LEN;
188 switch (dst->sa_family) {
191 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
192 return (0); /* if not yet resolved */
193 type = htons(ETHERTYPE_IP);
198 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
199 /* Something bad happened */
202 type = htons(ETHERTYPE_IPV6);
208 error = ef_outputp(ifp, &m, dst, &type, &hlen);
212 type = htons(ETHERTYPE_IPX);
213 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
214 (caddr_t)edst, sizeof (edst));
220 struct at_ifaddr *aa;
222 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
225 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
228 * In the phase 2 case, need to prepend an mbuf for the llc header.
229 * Since we must preserve the value of m, which is passed to us by
230 * value, we m_copy() the first mbuf, and use it for our llc header.
232 if ( aa->aa_flags & AFA_PHASE2 ) {
235 M_PREPEND(m, sizeof(struct llc), MB_WAIT);
236 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
237 llc.llc_control = LLC_UI;
238 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
239 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
240 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
241 type = htons(m->m_pkthdr.len);
242 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
244 type = htons(ETHERTYPE_AT);
248 #endif /* NETATALK */
253 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
256 case 0x0: /* Novell 802.3 */
257 type = htons( m->m_pkthdr.len);
259 case 0xe0e0: /* Novell 802.2 and Token-Ring */
260 M_PREPEND(m, 3, MB_WAIT);
261 type = htons( m->m_pkthdr.len);
262 cp = mtod(m, u_char *);
268 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
269 (caddr_t)edst, sizeof (edst));
271 * XXX if ns_thishost is the same as the node's ethernet
272 * address then just the default code will catch this anyhow.
273 * So I'm not sure if this next clause should be here at all?
276 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){
277 m->m_pkthdr.rcvif = ifp;
278 netisr_dispatch(NETISR_NS, m);
281 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){
282 m->m_flags |= M_BCAST;
287 case pseudo_AF_HDRCMPLT:
289 eh = (struct ether_header *)dst->sa_data;
290 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
294 loop_copy = -1; /* if this is for us, don't do it */
295 eh = (struct ether_header *)dst->sa_data;
296 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
297 type = eh->ether_type;
301 printf("%s: can't handle af%d\n", ifp->if_xname,
303 senderr(EAFNOSUPPORT);
307 * Add local net header. If no space in first mbuf,
310 M_PREPEND(m, sizeof (struct ether_header), MB_DONTWAIT);
313 eh = mtod(m, struct ether_header *);
314 (void)memcpy(&eh->ether_type, &type,
315 sizeof(eh->ether_type));
316 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
318 (void)memcpy(eh->ether_shost, esrc,
319 sizeof(eh->ether_shost));
321 (void)memcpy(eh->ether_shost, ac->ac_enaddr,
322 sizeof(eh->ether_shost));
325 * If a simplex interface, and the packet is being sent to our
326 * Ethernet address or a broadcast address, loopback a copy.
327 * XXX To make a simplex device behave exactly like a duplex
328 * device, we should copy in the case of sending to our own
329 * ethernet address (thus letting the original actually appear
330 * on the wire). However, we don't do that here for security
331 * reasons and compatibility with the original behavior.
333 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
336 if (m->m_pkthdr.csum_flags & CSUM_IP)
337 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
338 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
339 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
340 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
343 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
344 n->m_pkthdr.csum_flags |= csum_flags;
345 if (csum_flags & CSUM_DATA_VALID)
346 n->m_pkthdr.csum_data = 0xffff;
347 (void)if_simloop(ifp, n, dst->sa_family, hlen);
350 } else if (bcmp(eh->ether_dhost,
351 eh->ether_shost, ETHER_ADDR_LEN) == 0) {
352 m->m_pkthdr.csum_flags |= csum_flags;
353 if (csum_flags & CSUM_DATA_VALID)
354 m->m_pkthdr.csum_data = 0xffff;
355 (void) if_simloop(ifp, m, dst->sa_family, hlen);
356 return (0); /* XXX */
360 /* Handle ng_ether(4) processing, if any */
361 if (ng_ether_output_p != NULL) {
362 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
371 /* Continue with link-layer output */
372 return ether_output_frame(ifp, m);
376 * Ethernet link layer output routine to send a raw frame to the device.
378 * This assumes that the 14 byte Ethernet header is present and contiguous
379 * in the first mbuf (if BRIDGE'ing).
382 ether_output_frame(ifp, m)
388 struct ip_fw *rule = NULL;
390 /* Extract info from dummynet tag, ignore others */
391 for (; m->m_type == MT_TAG; m = m->m_next)
392 if (m->m_flags == PACKET_TAG_DUMMYNET)
393 rule = ((struct dn_pkt *)m)->rule;
395 if (rule) /* packet was already bridged */
398 if (BDG_ACTIVE(ifp) ) {
399 struct ether_header *eh; /* a ptr suffices */
401 m->m_pkthdr.rcvif = NULL;
402 eh = mtod(m, struct ether_header *);
403 m_adj(m, ETHER_HDR_LEN);
404 m = bdg_forward_ptr(m, eh, ifp);
412 if (IPFW_LOADED && ether_ipfw != 0) {
413 struct ether_header save_eh, *eh;
415 eh = mtod(m, struct ether_header *);
417 m_adj(m, ETHER_HDR_LEN);
418 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) {
421 return ENOBUFS; /* pkt dropped */
423 return 0; /* consumed e.g. in a pipe */
425 /* packet was ok, restore the ethernet header */
426 if ( (void *)(eh + 1) == (void *)m->m_data) {
427 m->m_data -= ETHER_HDR_LEN ;
428 m->m_len += ETHER_HDR_LEN ;
429 m->m_pkthdr.len += ETHER_HDR_LEN ;
431 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
432 if (m == NULL) /* nope... */
434 bcopy(&save_eh, mtod(m, struct ether_header *),
440 * Queue message on interface, update output statistics if
441 * successful, and start output if interface not yet active.
443 if (!IF_HANDOFF(&ifp->if_snd, m, ifp))
450 * ipfw processing for ethernet packets (in and out).
451 * The second parameter is NULL from ether_demux, and ifp from
452 * ether_output_frame. This section of code could be used from
453 * bridge.c as well as long as we use some extra info
454 * to distinguish that case from ether_output_frame();
457 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
458 struct ip_fw **rule, struct ether_header *eh, int shared)
460 struct ether_header save_eh = *eh; /* might be a ptr in m */
462 struct ip_fw_args args;
464 if (*rule != NULL && fw_one_pass)
465 return 1; /* dummynet packet, already partially processed */
468 * I need some amt of data to be contiguous, and in case others need
469 * the packet (shared==1) also better be in the first mbuf.
471 i = min( (*m0)->m_pkthdr.len, max_protohdr);
472 if ( shared || (*m0)->m_len < i) {
473 *m0 = m_pullup(*m0, i);
478 args.m = *m0; /* the packet we are looking at */
479 args.oif = dst; /* destination, if any */
480 args.divert_rule = 0; /* we do not support divert yet */
481 args.rule = *rule; /* matching rule to restart */
482 args.next_hop = NULL; /* we do not support forward yet */
483 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
484 i = ip_fw_chk_ptr(&args);
488 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
491 if (i == 0) /* a PASS rule. */
494 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
496 * Pass the pkt to dummynet, which consumes it.
497 * If shared, make a copy and keep the original.
502 m = m_copypacket(*m0, MB_DONTWAIT);
506 m = *m0 ; /* pass the original to dummynet */
507 *m0 = NULL ; /* and nothing back to the caller */
510 * Prepend the header, optimize for the common case of
511 * eh pointing into the mbuf.
513 if ( (void *)(eh + 1) == (void *)m->m_data) {
514 m->m_data -= ETHER_HDR_LEN ;
515 m->m_len += ETHER_HDR_LEN ;
516 m->m_pkthdr.len += ETHER_HDR_LEN ;
518 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
519 if (m == NULL) /* nope... */
521 bcopy(&save_eh, mtod(m, struct ether_header *),
524 ip_dn_io_ptr(m, (i & 0xffff),
525 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
529 * XXX at some point add support for divert/forward actions.
530 * If none of the above matches, we have to drop the pkt.
536 * Process a received Ethernet packet. We have two different interfaces:
537 * one (conventional) assumes the packet in the mbuf, with the ethernet
538 * header provided separately in *eh. The second one (new) has everything
539 * in the mbuf, and we can tell it because eh == NULL.
540 * The caller MUST MAKE SURE that there are at least
541 * sizeof(struct ether_header) bytes in the first mbuf.
543 * This allows us to concentrate in one place a bunch of code which
544 * is replicated in all device drivers. Also, many functions called
545 * from ether_input() try to put the eh back into the mbuf, so we
546 * can later propagate the 'contiguous packet' interface to them,
547 * and handle the old interface just here.
549 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or
550 * cluster, right before m_data. So be very careful when working on m,
551 * as you could destroy *eh !!
553 * First we perform any link layer operations, then continue
554 * to the upper layers with ether_demux().
557 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
559 struct ether_header save_eh;
562 if (m->m_len < sizeof(struct ether_header)) {
563 /* XXX error in the caller. */
567 m->m_pkthdr.rcvif = ifp;
568 eh = mtod(m, struct ether_header *);
569 m->m_data += sizeof(struct ether_header);
570 m->m_len -= sizeof(struct ether_header);
571 m->m_pkthdr.len = m->m_len;
574 /* Check for a BPF tap */
575 if (ifp->if_bpf != NULL) {
578 /* This kludge is OK; BPF treats the "mbuf" as read-only */
580 mh.mh_data = (char *)eh;
581 mh.mh_len = ETHER_HDR_LEN;
582 bpf_mtap(ifp, (struct mbuf *)&mh);
585 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
587 /* Handle ng_ether(4) processing, if any */
588 if (ng_ether_input_p != NULL) {
589 (*ng_ether_input_p)(ifp, &m, eh);
594 /* Check for bridging mode */
595 if (BDG_ACTIVE(ifp) ) {
598 /* Check with bridging code */
599 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) {
603 if (bif != BDG_LOCAL) {
604 save_eh = *eh ; /* because it might change */
605 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */
607 * Do not continue if bdg_forward_ptr() processed our
608 * packet (and cleared the mbuf pointer m) or if
609 * it dropped (m_free'd) the packet itself.
612 if (bif == BDG_BCAST || bif == BDG_MCAST)
613 printf("bdg_forward drop MULTICAST PKT\n");
621 goto recvLocal; /* receive locally */
623 /* If not local and not multicast, just drop it */
630 /* Continue with upper layer processing */
631 ether_demux(ifp, eh, m);
635 * Upper layer processing for a received Ethernet packet.
638 ether_demux(ifp, eh, m)
640 struct ether_header *eh;
645 #if defined(NETATALK)
648 struct ip_fw *rule = NULL;
650 /* Extract info from dummynet tag, ignore others */
651 for (;m->m_type == MT_TAG; m = m->m_next)
652 if (m->m_flags == PACKET_TAG_DUMMYNET) {
653 rule = ((struct dn_pkt *)m)->rule;
654 ifp = m->m_next->m_pkthdr.rcvif;
657 if (rule) /* packet was already bridged */
660 if (! (BDG_ACTIVE(ifp) ) )
661 /* Discard packet if upper layers shouldn't see it because it was
662 unicast to a different Ethernet address. If the driver is working
663 properly, then this situation can only happen when the interface
664 is in promiscuous mode. */
665 if ((ifp->if_flags & IFF_PROMISC) != 0
666 && (eh->ether_dhost[0] & 1) == 0
667 && bcmp(eh->ether_dhost,
668 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0
669 && (ifp->if_flags & IFF_PPROMISC) == 0) {
674 /* Discard packet if interface is not up */
675 if ((ifp->if_flags & IFF_UP) == 0) {
679 if (eh->ether_dhost[0] & 1) {
680 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
681 ifp->if_addrlen) == 0)
682 m->m_flags |= M_BCAST;
684 m->m_flags |= M_MCAST;
686 if (m->m_flags & (M_BCAST|M_MCAST))
690 if (IPFW_LOADED && ether_ipfw != 0) {
691 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) {
698 ether_type = ntohs(eh->ether_type);
700 switch (ether_type) {
703 if (ipflow_fastforward(m))
709 if (ifp->if_flags & IFF_NOARP) {
710 /* Discard packet if ARP is disabled on interface */
719 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
730 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
742 #endif /* NETATALK */
745 if (vlan_input_p != NULL)
746 (*vlan_input_p)(eh, m);
748 m->m_pkthdr.rcvif->if_noproto++;
755 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
759 checksum = mtod(m, ushort *);
761 if ((ether_type <= ETHERMTU) &&
762 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
763 if (*checksum == 0xE0E0) {
764 m->m_pkthdr.len -= 3;
773 if (ether_type > ETHERMTU)
775 l = mtod(m, struct llc *);
776 if (l->llc_dsap == LLC_SNAP_LSAP &&
777 l->llc_ssap == LLC_SNAP_LSAP &&
778 l->llc_control == LLC_UI) {
779 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code,
780 sizeof(at_org_code)) == 0 &&
781 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
782 m_adj(m, sizeof(struct llc));
786 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
787 sizeof(aarp_org_code)) == 0 &&
788 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
789 m_adj(m, sizeof(struct llc));
795 #endif /* NETATALK */
796 if (ng_ether_input_orphan_p != NULL)
797 (*ng_ether_input_orphan_p)(ifp, m, eh);
802 netisr_dispatch(isr, m);
806 * Perform common duties while attaching to interface list
810 ether_ifattach(struct ifnet *ifp, uint8_t *lla)
812 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header));
816 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen)
819 struct sockaddr_dl *sdl;
821 ifp->if_type = IFT_ETHER;
822 ifp->if_addrlen = ETHER_ADDR_LEN;
823 ifp->if_broadcastaddr = etherbroadcastaddr;
826 ifp->if_mtu = ETHERMTU;
827 ifp->if_resolvemulti = ether_resolvemulti;
828 if (ifp->if_baudrate == 0)
829 ifp->if_baudrate = 10000000;
830 ifa = ifnet_addrs[ifp->if_index - 1];
831 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
832 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
833 sdl->sdl_type = IFT_ETHER;
834 sdl->sdl_alen = ifp->if_addrlen;
835 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
837 * XXX Keep the current drivers happy.
838 * XXX Remove once all drivers have been cleaned up
840 if (lla != IFP2AC(ifp)->ac_enaddr)
841 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
842 bpfattach(ifp, dlt, hdrlen);
843 if (ng_ether_attach_p != NULL)
844 (*ng_ether_attach_p)(ifp);
848 if_printf(ifp, "MAC address: %6D\n", lla, ":");
852 * Perform common duties while detaching an Ethernet interface
855 ether_ifdetach(struct ifnet *ifp)
857 if (ng_ether_detach_p != NULL)
858 (*ng_ether_detach_p)(ifp);
865 SYSCTL_DECL(_net_link);
866 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
867 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
868 ðer_ipfw,0,"Pass ether pkts through firewall");
871 ether_ioctl(ifp, command, data)
876 struct ifaddr *ifa = (struct ifaddr *) data;
877 struct ifreq *ifr = (struct ifreq *) data;
882 ifp->if_flags |= IFF_UP;
884 switch (ifa->ifa_addr->sa_family) {
887 ifp->if_init(ifp->if_softc); /* before arpwhohas */
888 arp_ifinit(ifp, ifa);
893 * XXX - This code is probably wrong
897 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
898 struct arpcom *ac = IFP2AC(ifp);
900 if (ipx_nullhost(*ina))
905 bcopy((caddr_t) ina->x_host.c_host,
906 (caddr_t) ac->ac_enaddr,
907 sizeof(ac->ac_enaddr));
913 ifp->if_init(ifp->if_softc);
919 * XXX - This code is probably wrong
923 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
924 struct arpcom *ac = IFP2AC(ifp);
926 if (ns_nullhost(*ina))
928 *(union ns_host *) (ac->ac_enaddr);
930 bcopy((caddr_t) ina->x_host.c_host,
931 (caddr_t) ac->ac_enaddr,
932 sizeof(ac->ac_enaddr));
938 ifp->if_init(ifp->if_softc);
943 ifp->if_init(ifp->if_softc);
952 sa = (struct sockaddr *) & ifr->ifr_data;
953 bcopy(IFP2AC(ifp)->ac_enaddr,
954 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
960 * Set the interface MTU.
962 if (ifr->ifr_mtu > ETHERMTU) {
965 ifp->if_mtu = ifr->ifr_mtu;
976 ether_resolvemulti(ifp, llsa, sa)
978 struct sockaddr **llsa;
981 struct sockaddr_dl *sdl;
982 struct sockaddr_in *sin;
984 struct sockaddr_in6 *sin6;
988 switch(sa->sa_family) {
991 * No mapping needed. Just check that it's a valid MC address.
993 sdl = (struct sockaddr_dl *)sa;
994 e_addr = LLADDR(sdl);
995 if ((e_addr[0] & 1) != 1)
996 return EADDRNOTAVAIL;
1002 sin = (struct sockaddr_in *)sa;
1003 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1004 return EADDRNOTAVAIL;
1005 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1007 sdl->sdl_len = sizeof *sdl;
1008 sdl->sdl_family = AF_LINK;
1009 sdl->sdl_index = ifp->if_index;
1010 sdl->sdl_type = IFT_ETHER;
1011 sdl->sdl_alen = ETHER_ADDR_LEN;
1012 e_addr = LLADDR(sdl);
1013 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1014 *llsa = (struct sockaddr *)sdl;
1019 sin6 = (struct sockaddr_in6 *)sa;
1020 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1022 * An IP6 address of 0 means listen to all
1023 * of the Ethernet multicast address used for IP6.
1024 * (This is used for multicast routers.)
1026 ifp->if_flags |= IFF_ALLMULTI;
1030 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1031 return EADDRNOTAVAIL;
1032 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1034 sdl->sdl_len = sizeof *sdl;
1035 sdl->sdl_family = AF_LINK;
1036 sdl->sdl_index = ifp->if_index;
1037 sdl->sdl_type = IFT_ETHER;
1038 sdl->sdl_alen = ETHER_ADDR_LEN;
1039 e_addr = LLADDR(sdl);
1040 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1041 *llsa = (struct sockaddr *)sdl;
1047 * Well, the text isn't quite right, but it's the name
1050 return EAFNOSUPPORT;
1056 * This is for reference. We have a table-driven version
1057 * of the little-endian crc32 generator, which is faster
1058 * than the double-loop.
1061 ether_crc32_le(const uint8_t *buf, size_t len)
1063 uint32_t c, crc, carry;
1066 crc = 0xffffffffU; /* initial value */
1068 for (i = 0; i < len; i++) {
1070 for (j = 0; j < 8; j++) {
1071 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1075 crc = (crc ^ ETHER_CRC_POLY_LE);
1083 ether_crc32_le(const uint8_t *buf, size_t len)
1085 static const uint32_t crctab[] = {
1086 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1087 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1088 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1089 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1094 crc = 0xffffffffU; /* initial value */
1096 for (i = 0; i < len; i++) {
1098 crc = (crc >> 4) ^ crctab[crc & 0xf];
1099 crc = (crc >> 4) ^ crctab[crc & 0xf];
1107 ether_crc32_be(const uint8_t *buf, size_t len)
1109 uint32_t c, crc, carry;
1112 crc = 0xffffffffU; /* initial value */
1114 for (i = 0; i < len; i++) {
1116 for (j = 0; j < 8; j++) {
1117 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1121 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;