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 1.47 2007/10/13 09:43:19 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
42 #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>
60 #include <net/ifq_var.h>
62 #include <net/ethernet.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 <netinet/ip_carp.h>
80 #include <netproto/ipx/ipx.h>
81 #include <netproto/ipx/ipx_if.h>
82 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m);
83 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst,
84 short *tp, int *hlen);
89 #include <netns/ns_if.h>
91 int ether_outputdebug = 0;
92 int ether_inputdebug = 0;
96 #include <netproto/atalk/at.h>
97 #include <netproto/atalk/at_var.h>
98 #include <netproto/atalk/at_extern.h>
100 #define llc_snap_org_code llc_un.type_snap.org_code
101 #define llc_snap_ether_type llc_un.type_snap.ether_type
103 extern u_char at_org_code[3];
104 extern u_char aarp_org_code[3];
105 #endif /* NETATALK */
107 /* netgraph node hooks for ng_ether(4) */
108 void (*ng_ether_input_p)(struct ifnet *ifp,
109 struct mbuf **mp, struct ether_header *eh);
110 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
111 struct mbuf *m, struct ether_header *eh);
112 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
113 void (*ng_ether_attach_p)(struct ifnet *ifp);
114 void (*ng_ether_detach_p)(struct ifnet *ifp);
116 int (*vlan_input_p)(const struct ether_header *eh, struct mbuf *m);
117 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t);
119 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
125 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
126 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
127 struct sockaddr *, struct rtentry *);
128 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
130 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
133 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
134 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
137 #define gotoerr(e) do { error = (e); goto bad; } while (0)
138 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
140 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
142 const struct ether_header *eh,
145 static int ether_ipfw;
146 SYSCTL_DECL(_net_link);
147 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
148 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
149 ðer_ipfw, 0, "Pass ether pkts through firewall");
152 * Ethernet output routine.
153 * Encapsulate a packet of type family for the local net.
154 * Use trailer local net encapsulation if enough data in first
155 * packet leaves a multiple of 512 bytes of data in remainder.
156 * Assumes that ifp is actually pointer to arpcom structure.
159 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
162 struct ether_header *eh, *deh;
165 int hlen = ETHER_HDR_LEN; /* link layer header length */
166 struct arpcom *ac = IFP2AC(ifp);
169 ASSERT_SERIALIZED(ifp->if_serializer);
171 if (ifp->if_flags & IFF_MONITOR)
173 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
176 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
179 eh = mtod(m, struct ether_header *);
180 edst = eh->ether_dhost;
183 * Fill in the destination ethernet address and frame type.
185 switch (dst->sa_family) {
188 if (!arpresolve(ifp, rt, m, dst, edst))
189 return (0); /* if not yet resolved */
190 eh->ether_type = htons(ETHERTYPE_IP);
195 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
196 return (0); /* Something bad happenned. */
197 eh->ether_type = htons(ETHERTYPE_IPV6);
202 if (ef_outputp != NULL) {
203 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
208 eh->ether_type = htons(ETHERTYPE_IPX);
209 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
210 edst, ETHER_ADDR_LEN);
216 struct at_ifaddr *aa;
218 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
223 * In the phase 2 case, need to prepend an mbuf for
224 * the llc header. Since we must preserve the value
225 * of m, which is passed to us by value, we m_copy()
226 * the first mbuf, and use it for our llc header.
228 if (aa->aa_flags & AFA_PHASE2) {
231 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
232 eh = mtod(m, struct ether_header *);
233 edst = eh->ether_dhost;
234 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
235 llc.llc_control = LLC_UI;
236 bcopy(at_org_code, llc.llc_snap_org_code,
238 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
240 mtod(m, caddr_t) + sizeof(struct ether_header),
242 eh->ether_type = htons(m->m_pkthdr.len);
243 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
245 eh->ether_type = htons(ETHERTYPE_AT);
247 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
256 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
257 eh->ether_type = 0x8137;
259 case 0x0: /* Novell 802.3 */
260 eh->ether_type = htons(m->m_pkthdr.len);
262 case 0xe0e0: /* Novell 802.2 and Token-Ring */
263 M_PREPEND(m, 3, MB_DONTWAIT);
264 eh = mtod(m, struct ether_header *);
265 edst = eh->ether_dhost;
266 eh->ether_type = htons(m->m_pkthdr.len);
267 cp = mtod(m, u_char *) + sizeof(struct ether_header);
273 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
276 * XXX if ns_thishost is the same as the node's ethernet
277 * address then just the default code will catch this anyhow.
278 * So I'm not sure if this next clause should be here at all?
281 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
282 m->m_pkthdr.rcvif = ifp;
283 netisr_dispatch(NETISR_NS, m);
286 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
287 m->m_flags |= M_BCAST;
290 case pseudo_AF_HDRCMPLT:
292 loop_copy = -1; /* if this is for us, don't do it */
293 deh = (struct ether_header *)dst->sa_data;
294 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
295 eh->ether_type = deh->ether_type;
299 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
300 gotoerr(EAFNOSUPPORT);
303 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
304 memcpy(eh->ether_shost,
305 ((struct ether_header *)dst->sa_data)->ether_shost,
308 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
311 * Bridges require special output handling.
313 if (ifp->if_bridge) {
314 KASSERT(bridge_output_p != NULL,
315 ("%s: if_bridge not loaded!", __func__));
316 return ((*bridge_output_p)(ifp, m, NULL, NULL));
320 * If a simplex interface, and the packet is being sent to our
321 * Ethernet address or a broadcast address, loopback a copy.
322 * XXX To make a simplex device behave exactly like a duplex
323 * device, we should copy in the case of sending to our own
324 * ethernet address (thus letting the original actually appear
325 * on the wire). However, we don't do that here for security
326 * reasons and compatibility with the original behavior.
328 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
331 if (m->m_pkthdr.csum_flags & CSUM_IP)
332 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
333 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
334 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
335 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
338 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
339 n->m_pkthdr.csum_flags |= csum_flags;
340 if (csum_flags & CSUM_DATA_VALID)
341 n->m_pkthdr.csum_data = 0xffff;
342 if_simloop(ifp, n, dst->sa_family, hlen);
345 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
346 ETHER_ADDR_LEN) == 0) {
347 m->m_pkthdr.csum_flags |= csum_flags;
348 if (csum_flags & CSUM_DATA_VALID)
349 m->m_pkthdr.csum_data = 0xffff;
350 if_simloop(ifp, m, dst->sa_family, hlen);
351 return (0); /* XXX */
356 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
361 /* Handle ng_ether(4) processing, if any */
362 if (ng_ether_output_p != NULL) {
363 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
369 /* Continue with link-layer output */
370 return ether_output_frame(ifp, m);
378 * Ethernet link layer output routine to send a raw frame to the device.
380 * This assumes that the 14 byte Ethernet header is present and contiguous
384 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
386 struct ip_fw *rule = NULL;
388 struct altq_pktattr pktattr;
390 ASSERT_SERIALIZED(ifp->if_serializer);
392 /* Extract info from dummynet tag, ignore others */
393 while (m->m_type == MT_TAG) {
394 if (m->m_flags == PACKET_TAG_DUMMYNET) {
395 rule = ((struct dn_pkt *)m)->rule;
401 if (ifq_is_enabled(&ifp->if_snd))
402 altq_etherclassify(&ifp->if_snd, m, &pktattr);
404 if (IPFW_LOADED && ether_ipfw != 0) {
405 struct ether_header save_eh, *eh;
407 eh = mtod(m, struct ether_header *);
409 m_adj(m, ETHER_HDR_LEN);
410 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) {
414 return ENOBUFS; /* pkt dropped */
416 return 0; /* consumed e.g. in a pipe */
418 eh = mtod(m, struct ether_header *);
419 /* packet was ok, restore the ethernet header */
420 if ((void *)(eh + 1) == (void *)m->m_data) {
421 m->m_data -= ETHER_HDR_LEN ;
422 m->m_len += ETHER_HDR_LEN ;
423 m->m_pkthdr.len += ETHER_HDR_LEN ;
425 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
426 if (m == NULL) /* nope... */ {
430 bcopy(&save_eh, mtod(m, struct ether_header *),
437 * Queue message on interface, update output statistics if
438 * successful, and start output if interface not yet active.
440 error = ifq_handoff(ifp, m, &pktattr);
445 * ipfw processing for ethernet packets (in and out).
446 * The second parameter is NULL from ether_demux(), and ifp from
447 * ether_output_frame().
454 const struct ether_header *eh,
457 struct ether_header save_eh = *eh; /* might be a ptr in m */
458 struct ip_fw_args args;
462 if (*rule != NULL && fw_one_pass)
463 return TRUE; /* dummynet packet, already partially processed */
466 * I need some amount of data to be contiguous, and in case others
467 * need the packet (shared==TRUE), it also better be in the first mbuf.
469 i = min((*m0)->m_pkthdr.len, max_protohdr);
470 if (shared || (*m0)->m_len < i) {
471 *m0 = m_pullup(*m0, i);
476 args.m = *m0; /* the packet we are looking at */
477 args.oif = dst; /* destination, if any */
478 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
479 m_tag_delete(*m0, mtag);
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 ((const 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);
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 * Process a received Ethernet packet.
537 * The ethernet header is assumed to be in the mbuf so the caller
538 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
539 * bytes in the first mbuf.
541 * This allows us to concentrate in one place a bunch of code which
542 * is replicated in all device drivers. Also, many functions called
543 * from ether_input() try to put the eh back into the mbuf, so we
544 * can later propagate the 'contiguous packet' interface to them.
546 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
547 * cluster, right before m_data. So be very careful when working on m,
548 * as you could destroy *eh !!
550 * First we perform any link layer operations, then continue to the
551 * upper layers with ether_demux().
554 ether_input(struct ifnet *ifp, struct mbuf *m)
556 struct ether_header *eh;
558 ASSERT_SERIALIZED(ifp->if_serializer);
560 if (m->m_len < sizeof(struct ether_header)) {
561 /* XXX error in the caller. */
565 m->m_pkthdr.rcvif = ifp;
569 ifp->if_ibytes += m->m_pkthdr.len;
571 if (ifp->if_flags & IFF_MONITOR) {
573 * Interface marked for monitoring; discard packet.
580 * Tap the packet off here for a bridge. bridge_input()
581 * will return NULL if it has consumed the packet, otherwise
582 * it gets processed as normal. Note that bridge_input()
583 * will always return the original packet if we need to
584 * process it locally.
586 if (ifp->if_bridge) {
587 KASSERT(bridge_input_p != NULL,
588 ("%s: if_bridge not loaded!", __func__));
590 if(m->m_flags & M_PROTO1) {
591 m->m_flags &= ~M_PROTO1;
593 /* clear M_PROMISC, in case the packets comes from a vlan */
594 /* m->m_flags &= ~M_PROMISC; */
595 lwkt_serialize_exit(ifp->if_serializer);
596 m = (*bridge_input_p)(ifp, m);
597 lwkt_serialize_enter(ifp->if_serializer);
601 KASSERT(ifp == m->m_pkthdr.rcvif,
602 ("bridge_input_p changed rcvif\n"));
606 eh = mtod(m, struct ether_header *);
608 /* XXX old crufty stuff, needs to be removed */
609 m_adj(m, sizeof(struct ether_header));
611 /* m->m_pkthdr.len = m->m_len; */
613 /* Handle ng_ether(4) processing, if any */
614 if (ng_ether_input_p != NULL) {
615 lwkt_serialize_exit(ifp->if_serializer);
616 (*ng_ether_input_p)(ifp, &m, eh);
617 lwkt_serialize_enter(ifp->if_serializer);
622 /* Continue with upper layer processing */
623 ether_demux(ifp, eh, m);
627 * Upper layer processing for a received Ethernet packet.
630 ether_demux(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
634 struct ip_fw *rule = NULL;
639 /* Extract info from dummynet tag, ignore others */
640 while (m->m_type == MT_TAG) {
641 if (m->m_flags == PACKET_TAG_DUMMYNET) {
642 rule = ((struct dn_pkt *)m)->rule;
643 ifp = m->m_next->m_pkthdr.rcvif;
648 if (rule) /* packet is passing the second time */
653 * XXX: Okay, we need to call carp_forus() and - if it is for
654 * us jump over code that does the normal check
655 * "ac_enaddr == ether_dhost". The check sequence is a bit
656 * different from OpenBSD, so we jump over as few code as
657 * possible, to catch _all_ sanity checks. This needs
658 * evaluation, to see if the carp ether_dhost values break any
661 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
666 * Discard packet if upper layers shouldn't see it because
667 * it was unicast to a different Ethernet address. If the
668 * driver is working properly, then this situation can only
669 * happen when the interface is in promiscuous mode.
671 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
672 (eh->ether_dhost[0] & 1) == 0 &&
673 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
682 /* Discard packet if interface is not up */
683 if (!(ifp->if_flags & IFF_UP)) {
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;
697 if (IPFW_LOADED && ether_ipfw != 0) {
698 if (!ether_ipfw_chk(&m, NULL, &rule, eh, FALSE)) {
702 eh = mtod(m, struct ether_header *);
705 ether_type = ntohs(eh->ether_type);
707 switch (ether_type) {
710 if (ipflow_fastforward(m, ifp->if_serializer))
716 if (ifp->if_flags & IFF_NOARP) {
717 /* Discard packet if ARP is disabled on interface */
733 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
740 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
756 if (vlan_input_p != NULL)
757 (*vlan_input_p)(eh, m);
759 m->m_pkthdr.rcvif->if_noproto++;
766 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
770 checksum = mtod(m, ushort *);
772 if ((ether_type <= ETHERMTU) &&
773 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
774 if (*checksum == 0xE0E0) {
775 m->m_pkthdr.len -= 3;
784 if (ether_type > ETHERMTU)
786 l = mtod(m, struct llc *);
787 if (l->llc_dsap == LLC_SNAP_LSAP &&
788 l->llc_ssap == LLC_SNAP_LSAP &&
789 l->llc_control == LLC_UI) {
790 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
791 sizeof at_org_code) == 0 &&
792 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
793 m_adj(m, sizeof(struct llc));
797 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
798 sizeof aarp_org_code) == 0 &&
799 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
800 m_adj(m, sizeof(struct llc));
807 if (ng_ether_input_orphan_p != NULL)
808 (*ng_ether_input_orphan_p)(ifp, m, eh);
813 netisr_dispatch(isr, m);
817 * Perform common duties while attaching to interface list
821 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
823 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
828 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
829 lwkt_serialize_t serializer)
831 struct sockaddr_dl *sdl;
833 ifp->if_type = IFT_ETHER;
834 ifp->if_addrlen = ETHER_ADDR_LEN;
835 ifp->if_hdrlen = ETHER_HDR_LEN;
836 if_attach(ifp, serializer);
837 ifp->if_mtu = ETHERMTU;
838 if (ifp->if_baudrate == 0)
839 ifp->if_baudrate = 10000000;
840 ifp->if_output = ether_output;
841 ifp->if_input = ether_input;
842 ifp->if_resolvemulti = ether_resolvemulti;
843 ifp->if_broadcastaddr = etherbroadcastaddr;
844 sdl = IF_LLSOCKADDR(ifp);
845 sdl->sdl_type = IFT_ETHER;
846 sdl->sdl_alen = ifp->if_addrlen;
847 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
849 * XXX Keep the current drivers happy.
850 * XXX Remove once all drivers have been cleaned up
852 if (lla != IFP2AC(ifp)->ac_enaddr)
853 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
854 bpfattach(ifp, dlt, hdrlen);
855 if (ng_ether_attach_p != NULL)
856 (*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)
869 if (ng_ether_detach_p != NULL)
870 (*ng_ether_detach_p)(ifp);
876 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
878 struct ifaddr *ifa = (struct ifaddr *) data;
879 struct ifreq *ifr = (struct ifreq *) data;
882 #define IF_INIT(ifp) \
884 if (((ifp)->if_flags & IFF_UP) == 0) { \
885 (ifp)->if_flags |= IFF_UP; \
886 (ifp)->if_init((ifp)->if_softc); \
890 ASSERT_SERIALIZED(ifp->if_serializer);
894 switch (ifa->ifa_addr->sa_family) {
897 IF_INIT(ifp); /* before arpwhohas */
898 arp_ifinit(ifp, ifa);
903 * XXX - This code is probably wrong
907 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
908 struct arpcom *ac = IFP2AC(ifp);
910 if (ipx_nullhost(*ina))
911 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
913 bcopy(ina->x_host.c_host, ac->ac_enaddr,
914 sizeof ac->ac_enaddr);
916 IF_INIT(ifp); /* Set new address. */
922 * XXX - This code is probably wrong
926 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
927 struct arpcom *ac = IFP2AC(ifp);
929 if (ns_nullhost(*ina))
930 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
932 bcopy(ina->x_host.c_host, ac->ac_enaddr,
933 sizeof ac->ac_enaddr);
949 bcopy(IFP2AC(ifp)->ac_enaddr,
950 ((struct sockaddr *)ifr->ifr_data)->sa_data,
956 * Set the interface MTU.
958 if (ifr->ifr_mtu > ETHERMTU) {
961 ifp->if_mtu = ifr->ifr_mtu;
976 struct sockaddr **llsa,
979 struct sockaddr_dl *sdl;
980 struct sockaddr_in *sin;
982 struct sockaddr_in6 *sin6;
986 switch(sa->sa_family) {
989 * No mapping needed. Just check that it's a valid MC address.
991 sdl = (struct sockaddr_dl *)sa;
992 e_addr = LLADDR(sdl);
993 if ((e_addr[0] & 1) != 1)
994 return EADDRNOTAVAIL;
1000 sin = (struct sockaddr_in *)sa;
1001 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1002 return EADDRNOTAVAIL;
1003 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1005 sdl->sdl_len = sizeof *sdl;
1006 sdl->sdl_family = AF_LINK;
1007 sdl->sdl_index = ifp->if_index;
1008 sdl->sdl_type = IFT_ETHER;
1009 sdl->sdl_alen = ETHER_ADDR_LEN;
1010 e_addr = LLADDR(sdl);
1011 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1012 *llsa = (struct sockaddr *)sdl;
1017 sin6 = (struct sockaddr_in6 *)sa;
1018 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1020 * An IP6 address of 0 means listen to all
1021 * of the Ethernet multicast address used for IP6.
1022 * (This is used for multicast routers.)
1024 ifp->if_flags |= IFF_ALLMULTI;
1028 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1029 return EADDRNOTAVAIL;
1030 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1032 sdl->sdl_len = sizeof *sdl;
1033 sdl->sdl_family = AF_LINK;
1034 sdl->sdl_index = ifp->if_index;
1035 sdl->sdl_type = IFT_ETHER;
1036 sdl->sdl_alen = ETHER_ADDR_LEN;
1037 e_addr = LLADDR(sdl);
1038 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1039 *llsa = (struct sockaddr *)sdl;
1045 * Well, the text isn't quite right, but it's the name
1048 return EAFNOSUPPORT;
1054 * This is for reference. We have a table-driven version
1055 * of the little-endian crc32 generator, which is faster
1056 * than the double-loop.
1059 ether_crc32_le(const uint8_t *buf, size_t len)
1061 uint32_t c, crc, carry;
1064 crc = 0xffffffffU; /* initial value */
1066 for (i = 0; i < len; i++) {
1068 for (j = 0; j < 8; j++) {
1069 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1073 crc = (crc ^ ETHER_CRC_POLY_LE);
1081 ether_crc32_le(const uint8_t *buf, size_t len)
1083 static const uint32_t crctab[] = {
1084 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1085 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1086 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1087 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1092 crc = 0xffffffffU; /* initial value */
1094 for (i = 0; i < len; i++) {
1096 crc = (crc >> 4) ^ crctab[crc & 0xf];
1097 crc = (crc >> 4) ^ crctab[crc & 0xf];
1105 ether_crc32_be(const uint8_t *buf, size_t len)
1107 uint32_t c, crc, carry;
1110 crc = 0xffffffffU; /* initial value */
1112 for (i = 0; i < len; i++) {
1114 for (j = 0; j < 8; j++) {
1115 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1119 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1127 * find the size of ethernet header, and call classifier
1130 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1131 struct altq_pktattr *pktattr)
1133 struct ether_header *eh;
1134 uint16_t ether_type;
1135 int hlen, af, hdrsize;
1138 hlen = sizeof(struct ether_header);
1139 eh = mtod(m, struct ether_header *);
1141 ether_type = ntohs(eh->ether_type);
1142 if (ether_type < ETHERMTU) {
1144 struct llc *llc = (struct llc *)(eh + 1);
1147 if (m->m_len < hlen ||
1148 llc->llc_dsap != LLC_SNAP_LSAP ||
1149 llc->llc_ssap != LLC_SNAP_LSAP ||
1150 llc->llc_control != LLC_UI)
1151 goto bad; /* not snap! */
1153 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1156 if (ether_type == ETHERTYPE_IP) {
1158 hdrsize = 20; /* sizeof(struct ip) */
1160 } else if (ether_type == ETHERTYPE_IPV6) {
1162 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1167 while (m->m_len <= hlen) {
1171 hdr = m->m_data + hlen;
1172 if (m->m_len < hlen + hdrsize) {
1174 * ip header is not in a single mbuf. this should not
1175 * happen in the current code.
1176 * (todo: use m_pulldown in the future)
1182 ifq_classify(ifq, m, af, pktattr);
1189 pktattr->pattr_class = NULL;
1190 pktattr->pattr_hdr = NULL;
1191 pktattr->pattr_af = AF_UNSPEC;