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 1.52 2007/11/27 11:06:31 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, const struct ether_header *eh);
110 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
111 struct mbuf *m, const 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;
391 ASSERT_SERIALIZED(ifp->if_serializer);
393 /* Extract info from dummynet tag */
394 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
396 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
398 m_tag_delete(m, mtag);
402 if (ifq_is_enabled(&ifp->if_snd))
403 altq_etherclassify(&ifp->if_snd, m, &pktattr);
405 if (IPFW_LOADED && ether_ipfw != 0) {
406 struct ether_header save_eh, *eh;
408 eh = mtod(m, struct ether_header *);
410 m_adj(m, ETHER_HDR_LEN);
411 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) {
415 return ENOBUFS; /* pkt dropped */
417 return 0; /* consumed e.g. in a pipe */
419 eh = mtod(m, struct ether_header *);
420 /* packet was ok, restore the ethernet header */
421 if ((void *)(eh + 1) == (void *)m->m_data) {
422 m->m_data -= ETHER_HDR_LEN ;
423 m->m_len += ETHER_HDR_LEN ;
424 m->m_pkthdr.len += ETHER_HDR_LEN ;
426 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
427 if (m == NULL) /* nope... */ {
431 bcopy(&save_eh, mtod(m, struct ether_header *),
438 * Queue message on interface, update output statistics if
439 * successful, and start output if interface not yet active.
441 error = ifq_handoff(ifp, m, &pktattr);
446 * ipfw processing for ethernet packets (in and out).
447 * The second parameter is NULL from ether_demux(), and ifp from
448 * ether_output_frame().
455 const struct ether_header *eh,
458 struct ether_header save_eh = *eh; /* might be a ptr in m */
459 struct ip_fw_args args;
463 if (*rule != NULL && fw_one_pass)
464 return TRUE; /* dummynet packet, already partially processed */
467 * I need some amount of data to be contiguous, and in case others
468 * need the packet (shared==TRUE), it 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 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
480 m_tag_delete(*m0, mtag);
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 (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 ((const 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);
521 bcopy(&save_eh, mtod(m, struct ether_header *),
524 ip_fw_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.
538 * The ethernet header is assumed to be in the mbuf so the caller
539 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
540 * bytes in the first mbuf.
542 * This allows us to concentrate in one place a bunch of code which
543 * is replicated in all device drivers. Also, many functions called
544 * from ether_input() try to put the eh back into the mbuf, so we
545 * can later propagate the 'contiguous packet' interface to them.
547 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
548 * cluster, right before m_data. So be very careful when working on m,
549 * as you could destroy *eh !!
551 * First we perform any link layer operations, then continue to the
552 * upper layers with ether_demux().
555 ether_input(struct ifnet *ifp, struct mbuf *m)
557 struct ether_header *eh;
559 ASSERT_SERIALIZED(ifp->if_serializer);
562 /* Discard packet if interface is not up */
563 if (!(ifp->if_flags & IFF_UP)) {
568 if (m->m_len < sizeof(struct ether_header)) {
569 /* XXX error in the caller. */
573 eh = mtod(m, struct ether_header *);
575 m->m_pkthdr.rcvif = ifp;
577 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
578 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
579 ifp->if_addrlen) == 0)
580 m->m_flags |= M_BCAST;
582 m->m_flags |= M_MCAST;
588 ifp->if_ibytes += m->m_pkthdr.len;
590 if (ifp->if_flags & IFF_MONITOR) {
592 * Interface marked for monitoring; discard packet.
599 * Tap the packet off here for a bridge. bridge_input()
600 * will return NULL if it has consumed the packet, otherwise
601 * it gets processed as normal. Note that bridge_input()
602 * will always return the original packet if we need to
603 * process it locally.
605 if (ifp->if_bridge) {
606 KASSERT(bridge_input_p != NULL,
607 ("%s: if_bridge not loaded!", __func__));
609 if(m->m_flags & M_PROTO1) {
610 m->m_flags &= ~M_PROTO1;
612 /* clear M_PROMISC, in case the packets comes from a vlan */
613 /* m->m_flags &= ~M_PROMISC; */
614 lwkt_serialize_exit(ifp->if_serializer);
615 m = (*bridge_input_p)(ifp, m);
616 lwkt_serialize_enter(ifp->if_serializer);
620 KASSERT(ifp == m->m_pkthdr.rcvif,
621 ("bridge_input_p changed rcvif\n"));
623 /* 'm' may be changed by bridge_input_p() */
624 eh = mtod(m, struct ether_header *);
628 /* XXX old crufty stuff, needs to be removed */
629 m_adj(m, sizeof(struct ether_header));
631 /* m->m_pkthdr.len = m->m_len; */
633 /* Handle ng_ether(4) processing, if any */
634 if (ng_ether_input_p != NULL) {
635 lwkt_serialize_exit(ifp->if_serializer);
636 (*ng_ether_input_p)(ifp, &m, eh);
637 lwkt_serialize_enter(ifp->if_serializer);
642 /* Continue with upper layer processing */
643 ether_demux(ifp, eh, m);
647 * Upper layer processing for a received Ethernet packet.
650 ether_demux(struct ifnet *ifp, struct ether_header *eh0, struct mbuf *m)
652 struct ether_header eh;
655 struct ip_fw *rule = NULL;
663 /* Extract info from dummynet tag */
664 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
666 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
667 KKASSERT(ifp == NULL);
668 ifp = m->m_pkthdr.rcvif;
670 m_tag_delete(m, mtag);
673 if (rule) /* packet is passing the second time */
678 * XXX: Okay, we need to call carp_forus() and - if it is for
679 * us jump over code that does the normal check
680 * "ac_enaddr == ether_dhost". The check sequence is a bit
681 * different from OpenBSD, so we jump over as few code as
682 * possible, to catch _all_ sanity checks. This needs
683 * evaluation, to see if the carp ether_dhost values break any
686 if (ifp->if_carp && carp_forus(ifp->if_carp, eh.ether_dhost))
691 * Discard packet if upper layers shouldn't see it because
692 * it was unicast to a different Ethernet address. If the
693 * driver is working properly, then this situation can only
694 * happen when the interface is in promiscuous mode.
696 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
697 (eh.ether_dhost[0] & 1) == 0 &&
698 bcmp(eh.ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
704 if (IPFW_LOADED && ether_ipfw != 0) {
705 if (!ether_ipfw_chk(&m, NULL, &rule, &eh, FALSE)) {
711 ether_type = ntohs(eh.ether_type);
713 switch (ether_type) {
716 if (ipflow_fastforward(m, ifp->if_serializer))
722 if (ifp->if_flags & IFF_NOARP) {
723 /* Discard packet if ARP is disabled on interface */
739 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0)
746 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
762 if (vlan_input_p != NULL)
763 (*vlan_input_p)(&eh, m);
765 m->m_pkthdr.rcvif->if_noproto++;
772 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0)
776 checksum = mtod(m, ushort *);
778 if ((ether_type <= ETHERMTU) &&
779 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
780 if (*checksum == 0xE0E0) {
781 m->m_pkthdr.len -= 3;
790 if (ether_type > ETHERMTU)
792 l = mtod(m, struct llc *);
793 if (l->llc_dsap == LLC_SNAP_LSAP &&
794 l->llc_ssap == LLC_SNAP_LSAP &&
795 l->llc_control == LLC_UI) {
796 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
797 sizeof at_org_code) == 0 &&
798 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
799 m_adj(m, sizeof(struct llc));
803 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
804 sizeof aarp_org_code) == 0 &&
805 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
806 m_adj(m, sizeof(struct llc));
813 if (ng_ether_input_orphan_p != NULL)
814 (*ng_ether_input_orphan_p)(ifp, m, &eh);
819 netisr_dispatch(isr, m);
823 * Perform common duties while attaching to interface list
827 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
829 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
834 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
835 lwkt_serialize_t serializer)
837 struct sockaddr_dl *sdl;
839 ifp->if_type = IFT_ETHER;
840 ifp->if_addrlen = ETHER_ADDR_LEN;
841 ifp->if_hdrlen = ETHER_HDR_LEN;
842 if_attach(ifp, serializer);
843 ifp->if_mtu = ETHERMTU;
844 if (ifp->if_baudrate == 0)
845 ifp->if_baudrate = 10000000;
846 ifp->if_output = ether_output;
847 ifp->if_input = ether_input;
848 ifp->if_resolvemulti = ether_resolvemulti;
849 ifp->if_broadcastaddr = etherbroadcastaddr;
850 sdl = IF_LLSOCKADDR(ifp);
851 sdl->sdl_type = IFT_ETHER;
852 sdl->sdl_alen = ifp->if_addrlen;
853 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
855 * XXX Keep the current drivers happy.
856 * XXX Remove once all drivers have been cleaned up
858 if (lla != IFP2AC(ifp)->ac_enaddr)
859 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
860 bpfattach(ifp, dlt, hdrlen);
861 if (ng_ether_attach_p != NULL)
862 (*ng_ether_attach_p)(ifp);
864 if_printf(ifp, "MAC address: %6D\n", lla, ":");
868 * Perform common duties while detaching an Ethernet interface
871 ether_ifdetach(struct ifnet *ifp)
875 if (ng_ether_detach_p != NULL)
876 (*ng_ether_detach_p)(ifp);
882 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
884 struct ifaddr *ifa = (struct ifaddr *) data;
885 struct ifreq *ifr = (struct ifreq *) data;
888 #define IF_INIT(ifp) \
890 if (((ifp)->if_flags & IFF_UP) == 0) { \
891 (ifp)->if_flags |= IFF_UP; \
892 (ifp)->if_init((ifp)->if_softc); \
896 ASSERT_SERIALIZED(ifp->if_serializer);
900 switch (ifa->ifa_addr->sa_family) {
903 IF_INIT(ifp); /* 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))
917 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
919 bcopy(ina->x_host.c_host, ac->ac_enaddr,
920 sizeof ac->ac_enaddr);
922 IF_INIT(ifp); /* Set new address. */
928 * XXX - This code is probably wrong
932 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
933 struct arpcom *ac = IFP2AC(ifp);
935 if (ns_nullhost(*ina))
936 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
938 bcopy(ina->x_host.c_host, ac->ac_enaddr,
939 sizeof ac->ac_enaddr);
955 bcopy(IFP2AC(ifp)->ac_enaddr,
956 ((struct sockaddr *)ifr->ifr_data)->sa_data,
962 * Set the interface MTU.
964 if (ifr->ifr_mtu > ETHERMTU) {
967 ifp->if_mtu = ifr->ifr_mtu;
982 struct sockaddr **llsa,
985 struct sockaddr_dl *sdl;
986 struct sockaddr_in *sin;
988 struct sockaddr_in6 *sin6;
992 switch(sa->sa_family) {
995 * No mapping needed. Just check that it's a valid MC address.
997 sdl = (struct sockaddr_dl *)sa;
998 e_addr = LLADDR(sdl);
999 if ((e_addr[0] & 1) != 1)
1000 return EADDRNOTAVAIL;
1006 sin = (struct sockaddr_in *)sa;
1007 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1008 return EADDRNOTAVAIL;
1009 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1011 sdl->sdl_len = sizeof *sdl;
1012 sdl->sdl_family = AF_LINK;
1013 sdl->sdl_index = ifp->if_index;
1014 sdl->sdl_type = IFT_ETHER;
1015 sdl->sdl_alen = ETHER_ADDR_LEN;
1016 e_addr = LLADDR(sdl);
1017 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1018 *llsa = (struct sockaddr *)sdl;
1023 sin6 = (struct sockaddr_in6 *)sa;
1024 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1026 * An IP6 address of 0 means listen to all
1027 * of the Ethernet multicast address used for IP6.
1028 * (This is used for multicast routers.)
1030 ifp->if_flags |= IFF_ALLMULTI;
1034 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1035 return EADDRNOTAVAIL;
1036 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1038 sdl->sdl_len = sizeof *sdl;
1039 sdl->sdl_family = AF_LINK;
1040 sdl->sdl_index = ifp->if_index;
1041 sdl->sdl_type = IFT_ETHER;
1042 sdl->sdl_alen = ETHER_ADDR_LEN;
1043 e_addr = LLADDR(sdl);
1044 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1045 *llsa = (struct sockaddr *)sdl;
1051 * Well, the text isn't quite right, but it's the name
1054 return EAFNOSUPPORT;
1060 * This is for reference. We have a table-driven version
1061 * of the little-endian crc32 generator, which is faster
1062 * than the double-loop.
1065 ether_crc32_le(const uint8_t *buf, size_t len)
1067 uint32_t c, crc, carry;
1070 crc = 0xffffffffU; /* initial value */
1072 for (i = 0; i < len; i++) {
1074 for (j = 0; j < 8; j++) {
1075 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1079 crc = (crc ^ ETHER_CRC_POLY_LE);
1087 ether_crc32_le(const uint8_t *buf, size_t len)
1089 static const uint32_t crctab[] = {
1090 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1091 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1092 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1093 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1098 crc = 0xffffffffU; /* initial value */
1100 for (i = 0; i < len; i++) {
1102 crc = (crc >> 4) ^ crctab[crc & 0xf];
1103 crc = (crc >> 4) ^ crctab[crc & 0xf];
1111 ether_crc32_be(const uint8_t *buf, size_t len)
1113 uint32_t c, crc, carry;
1116 crc = 0xffffffffU; /* initial value */
1118 for (i = 0; i < len; i++) {
1120 for (j = 0; j < 8; j++) {
1121 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1125 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1133 * find the size of ethernet header, and call classifier
1136 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1137 struct altq_pktattr *pktattr)
1139 struct ether_header *eh;
1140 uint16_t ether_type;
1141 int hlen, af, hdrsize;
1144 hlen = sizeof(struct ether_header);
1145 eh = mtod(m, struct ether_header *);
1147 ether_type = ntohs(eh->ether_type);
1148 if (ether_type < ETHERMTU) {
1150 struct llc *llc = (struct llc *)(eh + 1);
1153 if (m->m_len < hlen ||
1154 llc->llc_dsap != LLC_SNAP_LSAP ||
1155 llc->llc_ssap != LLC_SNAP_LSAP ||
1156 llc->llc_control != LLC_UI)
1157 goto bad; /* not snap! */
1159 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1162 if (ether_type == ETHERTYPE_IP) {
1164 hdrsize = 20; /* sizeof(struct ip) */
1166 } else if (ether_type == ETHERTYPE_IPV6) {
1168 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1173 while (m->m_len <= hlen) {
1177 hdr = m->m_data + hlen;
1178 if (m->m_len < hlen + hdrsize) {
1180 * ip header is not in a single mbuf. this should not
1181 * happen in the current code.
1182 * (todo: use m_pulldown in the future)
1188 ifq_classify(ifq, m, af, pktattr);
1195 pktattr->pattr_class = NULL;
1196 pktattr->pattr_hdr = NULL;
1197 pktattr->pattr_af = AF_UNSPEC;