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 1.78 2008/07/27 02:41:07 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
43 #include "opt_netgraph.h"
45 #include "opt_ethernet.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/globaldata.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/msgport.h>
54 #include <sys/socket.h>
55 #include <sys/sockio.h>
56 #include <sys/sysctl.h>
57 #include <sys/thread.h>
58 #include <sys/thread2.h>
61 #include <net/netisr.h>
62 #include <net/route.h>
63 #include <net/if_llc.h>
64 #include <net/if_dl.h>
65 #include <net/if_types.h>
66 #include <net/ifq_var.h>
68 #include <net/ethernet.h>
69 #include <net/vlan/if_vlan_ether.h>
70 #include <net/netmsg2.h>
72 #if defined(INET) || defined(INET6)
73 #include <netinet/in.h>
74 #include <netinet/in_var.h>
75 #include <netinet/if_ether.h>
76 #include <net/ipfw/ip_fw.h>
77 #include <net/dummynet/ip_dummynet.h>
80 #include <netinet6/nd6.h>
84 #include <netinet/ip_carp.h>
88 #include <netproto/ipx/ipx.h>
89 #include <netproto/ipx/ipx_if.h>
90 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m);
91 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst,
92 short *tp, int *hlen);
97 #include <netns/ns_if.h>
99 int ether_outputdebug = 0;
100 int ether_inputdebug = 0;
104 #include <netproto/atalk/at.h>
105 #include <netproto/atalk/at_var.h>
106 #include <netproto/atalk/at_extern.h>
108 #define llc_snap_org_code llc_un.type_snap.org_code
109 #define llc_snap_ether_type llc_un.type_snap.ether_type
111 extern u_char at_org_code[3];
112 extern u_char aarp_org_code[3];
113 #endif /* NETATALK */
116 #include <netproto/mpls/mpls.h>
119 /* netgraph node hooks for ng_ether(4) */
120 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
121 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
122 struct mbuf *m, const struct ether_header *eh);
123 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
124 void (*ng_ether_attach_p)(struct ifnet *ifp);
125 void (*ng_ether_detach_p)(struct ifnet *ifp);
127 int (*vlan_input_p)(struct mbuf *, struct mbuf_chain *);
128 void (*vlan_input2_p)(struct mbuf *);
130 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
132 static void ether_restore_header(struct mbuf **, const struct ether_header *,
133 const struct ether_header *);
134 static void ether_demux_chain(struct ifnet *, struct mbuf *,
135 struct mbuf_chain *);
140 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
141 int (*bridge_output_p)(struct ifnet *, struct mbuf *);
142 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
144 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
147 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
148 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
151 #define gotoerr(e) do { error = (e); goto bad; } while (0)
152 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
154 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
156 const struct ether_header *eh);
158 static int ether_ipfw;
159 static u_int ether_restore_hdr;
160 static u_int ether_prepend_hdr;
162 SYSCTL_DECL(_net_link);
163 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
164 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
165 ðer_ipfw, 0, "Pass ether pkts through firewall");
166 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW,
167 ðer_restore_hdr, 0, "# of ether header restoration");
168 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW,
169 ðer_prepend_hdr, 0,
170 "# of ether header restoration which prepends mbuf");
173 * Ethernet output routine.
174 * Encapsulate a packet of type family for the local net.
175 * Use trailer local net encapsulation if enough data in first
176 * packet leaves a multiple of 512 bytes of data in remainder.
177 * Assumes that ifp is actually pointer to arpcom structure.
180 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
183 struct ether_header *eh, *deh;
186 int hlen = ETHER_HDR_LEN; /* link layer header length */
187 struct arpcom *ac = IFP2AC(ifp);
190 ASSERT_NOT_SERIALIZED(ifp->if_serializer);
192 if (ifp->if_flags & IFF_MONITOR)
194 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
197 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
200 eh = mtod(m, struct ether_header *);
201 edst = eh->ether_dhost;
204 * Fill in the destination ethernet address and frame type.
206 switch (dst->sa_family) {
209 if (!arpresolve(ifp, rt, m, dst, edst))
210 return (0); /* if not yet resolved */
211 eh->ether_type = htons(ETHERTYPE_IP);
216 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
217 return (0); /* Something bad happenned. */
218 eh->ether_type = htons(ETHERTYPE_IPV6);
223 if (ef_outputp != NULL) {
224 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
229 eh->ether_type = htons(ETHERTYPE_IPX);
230 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
231 edst, ETHER_ADDR_LEN);
237 struct at_ifaddr *aa;
239 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
244 * In the phase 2 case, need to prepend an mbuf for
245 * the llc header. Since we must preserve the value
246 * of m, which is passed to us by value, we m_copy()
247 * the first mbuf, and use it for our llc header.
249 if (aa->aa_flags & AFA_PHASE2) {
252 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
253 eh = mtod(m, struct ether_header *);
254 edst = eh->ether_dhost;
255 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
256 llc.llc_control = LLC_UI;
257 bcopy(at_org_code, llc.llc_snap_org_code,
259 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
261 mtod(m, caddr_t) + sizeof(struct ether_header),
263 eh->ether_type = htons(m->m_pkthdr.len);
264 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
266 eh->ether_type = htons(ETHERTYPE_AT);
268 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
277 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
278 eh->ether_type = 0x8137;
280 case 0x0: /* Novell 802.3 */
281 eh->ether_type = htons(m->m_pkthdr.len);
283 case 0xe0e0: /* Novell 802.2 and Token-Ring */
284 M_PREPEND(m, 3, MB_DONTWAIT);
285 eh = mtod(m, struct ether_header *);
286 edst = eh->ether_dhost;
287 eh->ether_type = htons(m->m_pkthdr.len);
288 cp = mtod(m, u_char *) + sizeof(struct ether_header);
294 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
297 * XXX if ns_thishost is the same as the node's ethernet
298 * address then just the default code will catch this anyhow.
299 * So I'm not sure if this next clause should be here at all?
302 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
303 m->m_pkthdr.rcvif = ifp;
304 netisr_dispatch(NETISR_NS, m);
307 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
308 m->m_flags |= M_BCAST;
314 struct sockaddr *sa_gw;
317 sa_gw = (struct sockaddr *)rt->rt_gateway;
319 /* We realy need a gateway. */
324 switch (sa_gw->sa_family) {
326 if (!arpresolve(ifp, rt, m, sa_gw, edst))
330 kprintf("ether_output: address family not supported to forward mpls packets: %d.\n", sa_gw->sa_family);
334 eh->ether_type = htons(ETHERTYPE_MPLS); /* XXX how about multicast? */
338 case pseudo_AF_HDRCMPLT:
340 loop_copy = -1; /* if this is for us, don't do it */
341 deh = (struct ether_header *)dst->sa_data;
342 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
343 eh->ether_type = deh->ether_type;
347 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
348 gotoerr(EAFNOSUPPORT);
351 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
352 memcpy(eh->ether_shost,
353 ((struct ether_header *)dst->sa_data)->ether_shost,
356 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
359 * Bridges require special output handling.
361 if (ifp->if_bridge) {
362 KASSERT(bridge_output_p != NULL,
363 ("%s: if_bridge not loaded!", __func__));
364 return bridge_output_p(ifp, m);
368 * If a simplex interface, and the packet is being sent to our
369 * Ethernet address or a broadcast address, loopback a copy.
370 * XXX To make a simplex device behave exactly like a duplex
371 * device, we should copy in the case of sending to our own
372 * ethernet address (thus letting the original actually appear
373 * on the wire). However, we don't do that here for security
374 * reasons and compatibility with the original behavior.
376 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
379 if (m->m_pkthdr.csum_flags & CSUM_IP)
380 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
381 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
382 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
383 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
386 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
387 n->m_pkthdr.csum_flags |= csum_flags;
388 if (csum_flags & CSUM_DATA_VALID)
389 n->m_pkthdr.csum_data = 0xffff;
390 if_simloop(ifp, n, dst->sa_family, hlen);
393 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
394 ETHER_ADDR_LEN) == 0) {
395 m->m_pkthdr.csum_flags |= csum_flags;
396 if (csum_flags & CSUM_DATA_VALID)
397 m->m_pkthdr.csum_data = 0xffff;
398 if_simloop(ifp, m, dst->sa_family, hlen);
399 return (0); /* XXX */
404 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
409 /* Handle ng_ether(4) processing, if any */
410 if (ng_ether_output_p != NULL) {
411 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
417 /* Continue with link-layer output */
418 return ether_output_frame(ifp, m);
426 * Ethernet link layer output routine to send a raw frame to the device.
428 * This assumes that the 14 byte Ethernet header is present and contiguous
432 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
434 struct ip_fw *rule = NULL;
436 struct altq_pktattr pktattr;
439 ASSERT_NOT_SERIALIZED(ifp->if_serializer);
441 /* Extract info from dummynet tag */
442 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
444 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
446 m_tag_delete(m, mtag);
450 if (ifq_is_enabled(&ifp->if_snd))
451 altq_etherclassify(&ifp->if_snd, m, &pktattr);
453 if (IPFW_LOADED && ether_ipfw != 0) {
454 struct ether_header save_eh, *eh;
456 eh = mtod(m, struct ether_header *);
458 m_adj(m, ETHER_HDR_LEN);
459 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) {
463 return ENOBUFS; /* pkt dropped */
465 return 0; /* consumed e.g. in a pipe */
468 /* packet was ok, restore the ethernet header */
469 ether_restore_header(&m, eh, &save_eh);
478 * Queue message on interface, update output statistics if
479 * successful, and start output if interface not yet active.
481 error = ifq_dispatch(ifp, m, &pktattr);
486 * ipfw processing for ethernet packets (in and out).
487 * The second parameter is NULL from ether_demux(), and ifp from
488 * ether_output_frame().
491 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule,
492 const struct ether_header *eh)
494 struct ether_header save_eh = *eh; /* might be a ptr in m */
495 struct ip_fw_args args;
499 if (*rule != NULL && fw_one_pass)
500 return TRUE; /* dummynet packet, already partially processed */
503 * I need some amount of data to be contiguous.
505 i = min((*m0)->m_pkthdr.len, max_protohdr);
506 if ((*m0)->m_len < i) {
507 *m0 = m_pullup(*m0, i);
512 args.m = *m0; /* the packet we are looking at */
513 args.oif = dst; /* destination, if any */
514 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
515 m_tag_delete(*m0, mtag);
516 args.rule = *rule; /* matching rule to restart */
517 args.next_hop = NULL; /* we do not support forward yet */
518 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
519 i = ip_fw_chk_ptr(&args);
523 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
526 if (i == 0) /* a PASS rule. */
529 if (i & IP_FW_PORT_DYNT_FLAG) {
531 * Pass the pkt to dummynet, which consumes it.
535 m = *m0; /* pass the original to dummynet */
536 *m0 = NULL; /* and nothing back to the caller */
538 ether_restore_header(&m, eh, &save_eh);
542 ip_fw_dn_io_ptr(m, (i & 0xffff),
543 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
547 * XXX at some point add support for divert/forward actions.
548 * If none of the above matches, we have to drop the pkt.
554 * Process a received Ethernet packet.
556 * The ethernet header is assumed to be in the mbuf so the caller
557 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
558 * bytes in the first mbuf.
560 * This allows us to concentrate in one place a bunch of code which
561 * is replicated in all device drivers. Also, many functions called
562 * from ether_input() try to put the eh back into the mbuf, so we
563 * can later propagate the 'contiguous packet' interface to them.
565 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
566 * cluster, right before m_data. So be very careful when working on m,
567 * as you could destroy *eh !!
569 * First we perform any link layer operations, then continue to the
570 * upper layers with ether_demux().
573 ether_input_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
575 struct ether_header *eh;
577 ASSERT_SERIALIZED(ifp->if_serializer);
580 /* Discard packet if interface is not up */
581 if (!(ifp->if_flags & IFF_UP)) {
586 if (m->m_len < sizeof(struct ether_header)) {
587 /* XXX error in the caller. */
591 eh = mtod(m, struct ether_header *);
593 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN &&
594 (m->m_flags & M_VLANTAG) == 0) {
596 * Extract vlan tag if hardware does not do it for us
598 vlan_ether_decap(&m);
601 eh = mtod(m, struct ether_header *);
604 m->m_pkthdr.rcvif = ifp;
606 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
607 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
608 ifp->if_addrlen) == 0)
609 m->m_flags |= M_BCAST;
611 m->m_flags |= M_MCAST;
615 ETHER_BPF_MTAP(ifp, m);
617 ifp->if_ibytes += m->m_pkthdr.len;
619 if (ifp->if_flags & IFF_MONITOR) {
621 * Interface marked for monitoring; discard packet.
628 * Tap the packet off here for a bridge. bridge_input()
629 * will return NULL if it has consumed the packet, otherwise
630 * it gets processed as normal. Note that bridge_input()
631 * will always return the original packet if we need to
632 * process it locally.
634 if (ifp->if_bridge) {
635 KASSERT(bridge_input_p != NULL,
636 ("%s: if_bridge not loaded!", __func__));
638 if(m->m_flags & M_PROTO1) {
639 m->m_flags &= ~M_PROTO1;
641 /* clear M_PROMISC, in case the packets comes from a vlan */
642 /* m->m_flags &= ~M_PROMISC; */
643 lwkt_serialize_exit(ifp->if_serializer);
644 m = bridge_input_p(ifp, m);
645 lwkt_serialize_enter(ifp->if_serializer);
649 KASSERT(ifp == m->m_pkthdr.rcvif,
650 ("bridge_input_p changed rcvif\n"));
652 /* 'm' may be changed by bridge_input_p() */
653 eh = mtod(m, struct ether_header *);
657 /* Handle ng_ether(4) processing, if any */
658 if (ng_ether_input_p != NULL) {
659 ng_ether_input_p(ifp, &m);
663 /* 'm' may be changed by ng_ether_input_p() */
664 eh = mtod(m, struct ether_header *);
667 /* Continue with upper layer processing */
668 ether_demux_chain(ifp, m, chain);
672 ether_input(struct ifnet *ifp, struct mbuf *m)
674 ether_input_chain(ifp, m, NULL);
678 * Upper layer processing for a received Ethernet packet.
681 ether_demux_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
683 struct ether_header save_eh, *eh;
686 struct ip_fw *rule = NULL;
693 KASSERT(m->m_len >= ETHER_HDR_LEN,
694 ("ether header is no contiguous!\n"));
696 eh = mtod(m, struct ether_header *);
699 /* XXX old crufty stuff, needs to be removed */
700 m_adj(m, sizeof(struct ether_header));
702 /* Extract info from dummynet tag */
703 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
705 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
706 KKASSERT(ifp == NULL);
707 ifp = m->m_pkthdr.rcvif;
709 m_tag_delete(m, mtag);
712 if (rule) /* packet is passing the second time */
717 * XXX: Okay, we need to call carp_forus() and - if it is for
718 * us jump over code that does the normal check
719 * "ac_enaddr == ether_dhost". The check sequence is a bit
720 * different from OpenBSD, so we jump over as few code as
721 * possible, to catch _all_ sanity checks. This needs
722 * evaluation, to see if the carp ether_dhost values break any
725 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
730 * Discard packet if upper layers shouldn't see it because
731 * it was unicast to a different Ethernet address. If the
732 * driver is working properly, then this situation can only
733 * happen when the interface is in promiscuous mode.
735 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
736 (eh->ether_dhost[0] & 1) == 0 &&
737 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
743 if (IPFW_LOADED && ether_ipfw != 0) {
744 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) {
750 ether_type = ntohs(save_eh.ether_type);
752 if (m->m_flags & M_VLANTAG) {
753 if (ether_type == ETHERTYPE_VLAN) {
755 * To prevent possible dangerous recursion,
756 * we don't do vlan-in-vlan
758 m->m_pkthdr.rcvif->if_noproto++;
763 if (vlan_input_p != NULL) {
764 ether_restore_header(&m, eh, &save_eh);
766 vlan_input_p(m, chain);
768 m->m_pkthdr.rcvif->if_noproto++;
773 KKASSERT(ether_type != ETHERTYPE_VLAN);
775 switch (ether_type) {
778 if (ipflow_fastforward(m, ifp->if_serializer))
784 if (ifp->if_flags & IFF_NOARP) {
785 /* Discard packet if ARP is disabled on interface */
801 if (ef_inputp && ef_inputp(ifp, &save_eh, m) == 0)
808 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
825 case ETHERTYPE_MPLS_MCAST:
832 if (ef_inputp && ef_inputp(ifp, &save_eh, m) == 0)
836 checksum = mtod(m, ushort *);
838 if ((ether_type <= ETHERMTU) &&
839 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
840 if (*checksum == 0xE0E0) {
841 m->m_pkthdr.len -= 3;
850 if (ether_type > ETHERMTU)
852 l = mtod(m, struct llc *);
853 if (l->llc_dsap == LLC_SNAP_LSAP &&
854 l->llc_ssap == LLC_SNAP_LSAP &&
855 l->llc_control == LLC_UI) {
856 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
857 sizeof at_org_code) == 0 &&
858 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
859 m_adj(m, sizeof(struct llc));
863 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
864 sizeof aarp_org_code) == 0 &&
865 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
866 m_adj(m, sizeof(struct llc));
873 if (ng_ether_input_orphan_p != NULL)
874 (*ng_ether_input_orphan_p)(ifp, m, &save_eh);
880 #ifdef ETHER_INPUT_CHAIN
882 struct mbuf_chain *c;
886 port = netisr_mport(isr, &m);
890 m->m_pkthdr.header = port; /* XXX */
891 cpuid = port->mpu_td->td_gd->gd_cpuid;
894 if (c->mc_head == NULL) {
895 c->mc_head = c->mc_tail = m;
897 c->mc_tail->m_nextpkt = m;
902 #endif /* ETHER_INPUT_CHAIN */
903 netisr_dispatch(isr, m);
907 ether_demux(struct ifnet *ifp, struct mbuf *m)
909 ether_demux_chain(ifp, m, NULL);
913 * Perform common duties while attaching to interface list
917 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
919 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
924 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
925 lwkt_serialize_t serializer)
927 struct sockaddr_dl *sdl;
929 ifp->if_type = IFT_ETHER;
930 ifp->if_addrlen = ETHER_ADDR_LEN;
931 ifp->if_hdrlen = ETHER_HDR_LEN;
932 if_attach(ifp, serializer);
933 ifp->if_mtu = ETHERMTU;
934 if (ifp->if_baudrate == 0)
935 ifp->if_baudrate = 10000000;
936 ifp->if_output = ether_output;
937 ifp->if_input = ether_input;
938 ifp->if_resolvemulti = ether_resolvemulti;
939 ifp->if_broadcastaddr = etherbroadcastaddr;
940 sdl = IF_LLSOCKADDR(ifp);
941 sdl->sdl_type = IFT_ETHER;
942 sdl->sdl_alen = ifp->if_addrlen;
943 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
945 * XXX Keep the current drivers happy.
946 * XXX Remove once all drivers have been cleaned up
948 if (lla != IFP2AC(ifp)->ac_enaddr)
949 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
950 bpfattach(ifp, dlt, hdrlen);
951 if (ng_ether_attach_p != NULL)
952 (*ng_ether_attach_p)(ifp);
954 if_printf(ifp, "MAC address: %6D\n", lla, ":");
958 * Perform common duties while detaching an Ethernet interface
961 ether_ifdetach(struct ifnet *ifp)
965 if (ng_ether_detach_p != NULL)
966 (*ng_ether_detach_p)(ifp);
972 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
974 struct ifaddr *ifa = (struct ifaddr *) data;
975 struct ifreq *ifr = (struct ifreq *) data;
978 #define IF_INIT(ifp) \
980 if (((ifp)->if_flags & IFF_UP) == 0) { \
981 (ifp)->if_flags |= IFF_UP; \
982 (ifp)->if_init((ifp)->if_softc); \
986 ASSERT_SERIALIZED(ifp->if_serializer);
990 switch (ifa->ifa_addr->sa_family) {
993 IF_INIT(ifp); /* before arpwhohas */
994 arp_ifinit(ifp, ifa);
999 * XXX - This code is probably wrong
1003 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
1004 struct arpcom *ac = IFP2AC(ifp);
1006 if (ipx_nullhost(*ina))
1007 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
1009 bcopy(ina->x_host.c_host, ac->ac_enaddr,
1010 sizeof ac->ac_enaddr);
1012 IF_INIT(ifp); /* Set new address. */
1018 * XXX - This code is probably wrong
1022 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
1023 struct arpcom *ac = IFP2AC(ifp);
1025 if (ns_nullhost(*ina))
1026 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
1028 bcopy(ina->x_host.c_host, ac->ac_enaddr,
1029 sizeof ac->ac_enaddr);
1045 bcopy(IFP2AC(ifp)->ac_enaddr,
1046 ((struct sockaddr *)ifr->ifr_data)->sa_data,
1052 * Set the interface MTU.
1054 if (ifr->ifr_mtu > ETHERMTU) {
1057 ifp->if_mtu = ifr->ifr_mtu;
1072 struct sockaddr **llsa,
1073 struct sockaddr *sa)
1075 struct sockaddr_dl *sdl;
1076 struct sockaddr_in *sin;
1078 struct sockaddr_in6 *sin6;
1082 switch(sa->sa_family) {
1085 * No mapping needed. Just check that it's a valid MC address.
1087 sdl = (struct sockaddr_dl *)sa;
1088 e_addr = LLADDR(sdl);
1089 if ((e_addr[0] & 1) != 1)
1090 return EADDRNOTAVAIL;
1096 sin = (struct sockaddr_in *)sa;
1097 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1098 return EADDRNOTAVAIL;
1099 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1101 sdl->sdl_len = sizeof *sdl;
1102 sdl->sdl_family = AF_LINK;
1103 sdl->sdl_index = ifp->if_index;
1104 sdl->sdl_type = IFT_ETHER;
1105 sdl->sdl_alen = ETHER_ADDR_LEN;
1106 e_addr = LLADDR(sdl);
1107 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1108 *llsa = (struct sockaddr *)sdl;
1113 sin6 = (struct sockaddr_in6 *)sa;
1114 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1116 * An IP6 address of 0 means listen to all
1117 * of the Ethernet multicast address used for IP6.
1118 * (This is used for multicast routers.)
1120 ifp->if_flags |= IFF_ALLMULTI;
1124 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1125 return EADDRNOTAVAIL;
1126 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1128 sdl->sdl_len = sizeof *sdl;
1129 sdl->sdl_family = AF_LINK;
1130 sdl->sdl_index = ifp->if_index;
1131 sdl->sdl_type = IFT_ETHER;
1132 sdl->sdl_alen = ETHER_ADDR_LEN;
1133 e_addr = LLADDR(sdl);
1134 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1135 *llsa = (struct sockaddr *)sdl;
1141 * Well, the text isn't quite right, but it's the name
1144 return EAFNOSUPPORT;
1150 * This is for reference. We have a table-driven version
1151 * of the little-endian crc32 generator, which is faster
1152 * than the double-loop.
1155 ether_crc32_le(const uint8_t *buf, size_t len)
1157 uint32_t c, crc, carry;
1160 crc = 0xffffffffU; /* initial value */
1162 for (i = 0; i < len; i++) {
1164 for (j = 0; j < 8; j++) {
1165 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1169 crc = (crc ^ ETHER_CRC_POLY_LE);
1177 ether_crc32_le(const uint8_t *buf, size_t len)
1179 static const uint32_t crctab[] = {
1180 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1181 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1182 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1183 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1188 crc = 0xffffffffU; /* initial value */
1190 for (i = 0; i < len; i++) {
1192 crc = (crc >> 4) ^ crctab[crc & 0xf];
1193 crc = (crc >> 4) ^ crctab[crc & 0xf];
1201 ether_crc32_be(const uint8_t *buf, size_t len)
1203 uint32_t c, crc, carry;
1206 crc = 0xffffffffU; /* initial value */
1208 for (i = 0; i < len; i++) {
1210 for (j = 0; j < 8; j++) {
1211 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1215 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1223 * find the size of ethernet header, and call classifier
1226 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1227 struct altq_pktattr *pktattr)
1229 struct ether_header *eh;
1230 uint16_t ether_type;
1231 int hlen, af, hdrsize;
1234 hlen = sizeof(struct ether_header);
1235 eh = mtod(m, struct ether_header *);
1237 ether_type = ntohs(eh->ether_type);
1238 if (ether_type < ETHERMTU) {
1240 struct llc *llc = (struct llc *)(eh + 1);
1243 if (m->m_len < hlen ||
1244 llc->llc_dsap != LLC_SNAP_LSAP ||
1245 llc->llc_ssap != LLC_SNAP_LSAP ||
1246 llc->llc_control != LLC_UI)
1247 goto bad; /* not snap! */
1249 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1252 if (ether_type == ETHERTYPE_IP) {
1254 hdrsize = 20; /* sizeof(struct ip) */
1256 } else if (ether_type == ETHERTYPE_IPV6) {
1258 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1263 while (m->m_len <= hlen) {
1267 hdr = m->m_data + hlen;
1268 if (m->m_len < hlen + hdrsize) {
1270 * ip header is not in a single mbuf. this should not
1271 * happen in the current code.
1272 * (todo: use m_pulldown in the future)
1278 ifq_classify(ifq, m, af, pktattr);
1285 pktattr->pattr_class = NULL;
1286 pktattr->pattr_hdr = NULL;
1287 pktattr->pattr_af = AF_UNSPEC;
1291 ether_restore_header(struct mbuf **m0, const struct ether_header *eh,
1292 const struct ether_header *save_eh)
1294 struct mbuf *m = *m0;
1296 ether_restore_hdr++;
1299 * Prepend the header, optimize for the common case of
1300 * eh pointing into the mbuf.
1302 if ((const void *)(eh + 1) == (void *)m->m_data) {
1303 m->m_data -= ETHER_HDR_LEN;
1304 m->m_len += ETHER_HDR_LEN;
1305 m->m_pkthdr.len += ETHER_HDR_LEN;
1307 ether_prepend_hdr++;
1309 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
1311 bcopy(save_eh, mtod(m, struct ether_header *),
1318 #ifdef ETHER_INPUT_CHAIN
1321 ether_input_ipifunc(void *arg)
1323 struct mbuf *m, *next;
1328 next = m->m_nextpkt;
1329 m->m_nextpkt = NULL;
1331 port = m->m_pkthdr.header;
1332 m->m_pkthdr.header = NULL;
1335 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg);
1338 } while (m != NULL);
1342 ether_input_dispatch(struct mbuf_chain *chain)
1347 for (i = 0; i < ncpus; ++i) {
1348 if (chain[i].mc_head != NULL) {
1349 lwkt_send_ipiq(globaldata_find(i),
1350 ether_input_ipifunc, chain[i].mc_head);
1354 if (chain->mc_head != NULL)
1355 ether_input_ipifunc(chain->mc_head);
1360 ether_input_chain_init(struct mbuf_chain *chain)
1365 for (i = 0; i < ncpus; ++i)
1366 chain[i].mc_head = chain[i].mc_tail = NULL;
1368 chain->mc_head = chain->mc_tail = NULL;
1372 #endif /* ETHER_INPUT_CHAIN */
1377 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m)
1379 struct ether_header *eh;
1380 int isr, redispatch;
1382 struct ip_fw *rule = NULL;
1389 KASSERT(m->m_len >= ETHER_HDR_LEN,
1390 ("ether header is no contiguous!\n"));
1392 eh = mtod(m, struct ether_header *);
1394 /* Extract info from dummynet tag */
1395 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
1397 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
1398 KKASSERT(ifp == NULL);
1399 ifp = m->m_pkthdr.rcvif;
1401 m_tag_delete(m, mtag);
1404 if (rule) /* packet is passing the second time */
1409 * XXX: Okay, we need to call carp_forus() and - if it is for
1410 * us jump over code that does the normal check
1411 * "ac_enaddr == ether_dhost". The check sequence is a bit
1412 * different from OpenBSD, so we jump over as few code as
1413 * possible, to catch _all_ sanity checks. This needs
1414 * evaluation, to see if the carp ether_dhost values break any
1417 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
1422 * Discard packet if upper layers shouldn't see it because
1423 * it was unicast to a different Ethernet address. If the
1424 * driver is working properly, then this situation can only
1425 * happen when the interface is in promiscuous mode.
1427 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
1428 (eh->ether_dhost[0] & 1) == 0 &&
1429 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
1435 if (IPFW_LOADED && ether_ipfw != 0) {
1436 struct ether_header save_eh = *eh;
1438 /* XXX old crufty stuff, needs to be removed */
1439 m_adj(m, sizeof(struct ether_header));
1441 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) {
1446 ether_restore_header(&m, eh, &save_eh);
1449 eh = mtod(m, struct ether_header *);
1452 ether_type = ntohs(eh->ether_type);
1453 KKASSERT(ether_type != ETHERTYPE_VLAN);
1455 if (m->m_flags & M_VLANTAG) {
1456 if (vlan_input2_p != NULL) {
1459 m->m_pkthdr.rcvif->if_noproto++;
1465 m_adj(m, sizeof(struct ether_header));
1468 switch (ether_type) {
1472 if (ipflow_fastforward(m, ifp->if_serializer))
1479 if (ifp->if_flags & IFF_NOARP) {
1480 /* Discard packet if ARP is disabled on interface */
1489 case ETHERTYPE_IPV6:
1496 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
1503 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1511 isr = NETISR_ATALK1;
1513 case ETHERTYPE_AARP:
1519 case ETHERTYPE_MPLS:
1520 case ETHERTYPE_MPLS_MCAST:
1527 * The accurate msgport is not determined before
1528 * we reach here, so redo the dispatching
1532 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
1536 checksum = mtod(m, ushort *);
1538 if ((ether_type <= ETHERMTU) &&
1539 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
1540 if (*checksum == 0xE0E0) {
1541 m->m_pkthdr.len -= 3;
1550 if (ether_type > ETHERMTU)
1552 l = mtod(m, struct llc *);
1553 if (l->llc_dsap == LLC_SNAP_LSAP &&
1554 l->llc_ssap == LLC_SNAP_LSAP &&
1555 l->llc_control == LLC_UI) {
1556 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
1557 sizeof at_org_code) == 0 &&
1558 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
1559 m_adj(m, sizeof(struct llc));
1560 isr = NETISR_ATALK2;
1563 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
1564 sizeof aarp_org_code) == 0 &&
1565 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
1566 m_adj(m, sizeof(struct llc));
1573 if (ng_ether_input_orphan_p != NULL)
1574 ng_ether_input_orphan_p(ifp, m, eh);
1583 netisr_dispatch(isr, m);
1587 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m)
1589 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) {
1591 * Receiving interface's flags are changed, when this
1592 * packet is waiting for processing; discard it.
1599 * Tap the packet off here for a bridge. bridge_input()
1600 * will return NULL if it has consumed the packet, otherwise
1601 * it gets processed as normal. Note that bridge_input()
1602 * will always return the original packet if we need to
1603 * process it locally.
1605 if (ifp->if_bridge) {
1606 KASSERT(bridge_input_p != NULL,
1607 ("%s: if_bridge not loaded!", __func__));
1609 if(m->m_flags & M_PROTO1) {
1610 m->m_flags &= ~M_PROTO1;
1612 /* clear M_PROMISC, in case the packets comes from a vlan */
1613 /* m->m_flags &= ~M_PROMISC; */
1614 m = bridge_input_p(ifp, m);
1618 KASSERT(ifp == m->m_pkthdr.rcvif,
1619 ("bridge_input_p changed rcvif\n"));
1623 /* Handle ng_ether(4) processing, if any */
1624 if (ng_ether_input_p != NULL) {
1625 ng_ether_input_p(ifp, &m);
1630 /* Continue with upper layer processing */
1631 ether_demux_oncpu(ifp, m);
1635 ether_input_handler(struct netmsg *nmsg)
1637 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg;
1643 ifp = m->m_pkthdr.rcvif;
1645 ether_input_oncpu(ifp, m);
1648 static __inline void
1649 ether_init_netpacket(int num, struct mbuf *m)
1651 struct netmsg_packet *pmsg;
1653 pmsg = &m->m_hdr.mh_netmsg;
1654 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0,
1655 ether_input_handler);
1656 pmsg->nm_packet = m;
1657 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num;
1660 static __inline struct lwkt_port *
1661 ether_mport(int num, struct mbuf **m)
1663 if (num == NETISR_MAX) {
1665 * All packets whose target msgports can't be
1666 * determined here are dispatched to netisr0,
1667 * where further dispatching may happen.
1669 return cpu_portfn(0);
1671 return netisr_find_port(num, m);
1675 * Process a received Ethernet packet.
1677 * The ethernet header is assumed to be in the mbuf so the caller
1678 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
1679 * bytes in the first mbuf.
1681 * We first try to find the target msgport for this ether frame, if
1682 * there is no target msgport for it, this ether frame is discarded,
1683 * else we do following processing according to whether 'chain' is
1685 * - If 'chain' is NULL, this ether frame is sent to the target msgport
1686 * immediately. This situation happens when ether_input_chain2 is
1687 * accessed through ifnet.if_input.
1688 * - If 'chain' is not NULL, this ether frame is queued to the 'chain'
1689 * bucket indexed by the target msgport's cpuid and the target msgport
1690 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain2
1691 * must initialize 'chain' by calling ether_input_chain_init().
1692 * ether_input_dispatch must be called later to send ether frames
1693 * queued on 'chain' to their target msgport.
1696 ether_input_chain2(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
1698 struct ether_header *eh, *save_eh, save_eh0;
1699 struct lwkt_port *port;
1700 uint16_t ether_type;
1703 ASSERT_SERIALIZED(ifp->if_serializer);
1706 /* Discard packet if interface is not up */
1707 if (!(ifp->if_flags & IFF_UP)) {
1712 if (m->m_len < sizeof(struct ether_header)) {
1713 /* XXX error in the caller. */
1717 eh = mtod(m, struct ether_header *);
1719 m->m_pkthdr.rcvif = ifp;
1721 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
1722 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
1723 ifp->if_addrlen) == 0)
1724 m->m_flags |= M_BCAST;
1726 m->m_flags |= M_MCAST;
1730 ETHER_BPF_MTAP(ifp, m);
1732 ifp->if_ibytes += m->m_pkthdr.len;
1734 if (ifp->if_flags & IFF_MONITOR) {
1736 * Interface marked for monitoring; discard packet.
1742 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN &&
1743 (m->m_flags & M_VLANTAG) == 0) {
1745 * Extract vlan tag if hardware does not do it for us
1747 vlan_ether_decap(&m);
1750 eh = mtod(m, struct ether_header *);
1752 ether_type = ntohs(eh->ether_type);
1754 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) {
1756 * To prevent possible dangerous recursion,
1757 * we don't do vlan-in-vlan
1763 KKASSERT(ether_type != ETHERTYPE_VLAN);
1766 * Map ether type to netisr id.
1768 switch (ether_type) {
1780 case ETHERTYPE_IPV6:
1792 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1799 isr = NETISR_ATALK1;
1801 case ETHERTYPE_AARP:
1807 case ETHERTYPE_MPLS:
1808 case ETHERTYPE_MPLS_MCAST:
1815 * NETISR_MAX is an invalid value; it is chosen to let
1816 * ether_mport() know that we are not able to decide
1817 * this packet's msgport here.
1824 * If the packet is in contiguous memory, following
1825 * m_adj() could ensure that the hidden ether header
1826 * will not be destroyed, else we will have to save
1827 * the ether header for the later restoration.
1829 if (m->m_pkthdr.len != m->m_len) {
1831 save_eh = &save_eh0;
1837 * Temporarily remove ether header; ether_mport()
1838 * expects a packet without ether header.
1840 m_adj(m, sizeof(struct ether_header));
1843 * Find the packet's target msgport.
1845 port = ether_mport(isr, &m);
1847 KKASSERT(m == NULL);
1852 * Restore ether header.
1854 if (save_eh != NULL) {
1855 ether_restore_header(&m, eh, save_eh);
1859 m->m_data -= ETHER_HDR_LEN;
1860 m->m_len += ETHER_HDR_LEN;
1861 m->m_pkthdr.len += ETHER_HDR_LEN;
1865 * Initialize mbuf's netmsg packet _after_ possible
1866 * ether header restoration, else the initialized
1867 * netmsg packet may be lost during ether header
1870 ether_init_netpacket(isr, m);
1872 #ifdef ETHER_INPUT_CHAIN
1873 if (chain != NULL) {
1874 struct mbuf_chain *c;
1877 m->m_pkthdr.header = port; /* XXX */
1878 cpuid = port->mpu_td->td_gd->gd_cpuid;
1881 if (c->mc_head == NULL) {
1882 c->mc_head = c->mc_tail = m;
1884 c->mc_tail->m_nextpkt = m;
1887 m->m_nextpkt = NULL;
1889 #endif /* ETHER_INPUT_CHAIN */
1890 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg);
1893 #endif /* ETHER_INPUT2 */