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 1.33 2005/11/28 17:13:45 dillon 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>
60 #include <net/ifq_var.h>
62 #include <net/ethernet.h>
63 #include <net/bridge/bridge.h>
65 #if defined(INET) || defined(INET6)
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/if_ether.h>
69 #include <net/ipfw/ip_fw.h>
70 #include <net/dummynet/ip_dummynet.h>
73 #include <netinet6/nd6.h>
77 #include <netproto/ipx/ipx.h>
78 #include <netproto/ipx/ipx_if.h>
79 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
80 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst,
81 short *tp, int *hlen);
86 #include <netns/ns_if.h>
88 int ether_outputdebug = 0;
89 int ether_inputdebug = 0;
93 #include <netproto/atalk/at.h>
94 #include <netproto/atalk/at_var.h>
95 #include <netproto/atalk/at_extern.h>
97 #define llc_snap_org_code llc_un.type_snap.org_code
98 #define llc_snap_ether_type llc_un.type_snap.ether_type
100 extern u_char at_org_code[3];
101 extern u_char aarp_org_code[3];
102 #endif /* NETATALK */
104 /* netgraph node hooks for ng_ether(4) */
105 void (*ng_ether_input_p)(struct ifnet *ifp,
106 struct mbuf **mp, struct ether_header *eh);
107 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
108 struct mbuf *m, struct ether_header *eh);
109 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
110 void (*ng_ether_attach_p)(struct ifnet *ifp);
111 void (*ng_ether_detach_p)(struct ifnet *ifp);
113 int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m);
114 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t);
116 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
123 bridge_in_t *bridge_in_ptr;
124 bdg_forward_t *bdg_forward_ptr;
125 bdgtakeifaces_t *bdgtakeifaces_ptr;
126 struct bdg_softc *ifp2sc;
128 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
131 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
132 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
135 #define gotoerr(e) do { error = (e); goto bad; } while (0)
136 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
138 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
139 struct ip_fw **rule, struct ether_header *eh,
142 static int ether_ipfw;
143 SYSCTL_DECL(_net_link);
144 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
145 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
146 ðer_ipfw, 0, "Pass ether pkts through firewall");
149 * Ethernet output routine.
150 * Encapsulate a packet of type family for the local net.
151 * Use trailer local net encapsulation if enough data in first
152 * packet leaves a multiple of 512 bytes of data in remainder.
153 * Assumes that ifp is actually pointer to arpcom structure.
156 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
159 struct ether_header *eh, *deh;
162 int hlen = ETHER_HDR_LEN; /* link layer header length */
163 struct arpcom *ac = IFP2AC(ifp);
166 ASSERT_SERIALIZED(ifp->if_serializer);
168 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
171 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
174 eh = mtod(m, struct ether_header *);
175 edst = eh->ether_dhost;
178 * Fill in the destination ethernet address and frame type.
180 switch (dst->sa_family) {
183 if (!arpresolve(ifp, rt, m, dst, edst))
184 return (0); /* if not yet resolved */
185 eh->ether_type = htons(ETHERTYPE_IP);
190 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
191 return (0); /* Something bad happenned. */
192 eh->ether_type = htons(ETHERTYPE_IPV6);
197 if (ef_outputp != NULL) {
198 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
203 eh->ether_type = htons(ETHERTYPE_IPX);
204 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
205 edst, ETHER_ADDR_LEN);
211 struct at_ifaddr *aa;
213 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
218 * In the phase 2 case, need to prepend an mbuf for
219 * the llc header. Since we must preserve the value
220 * of m, which is passed to us by value, we m_copy()
221 * the first mbuf, and use it for our llc header.
223 if (aa->aa_flags & AFA_PHASE2) {
226 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
227 eh = mtod(m, struct ether_header *);
228 edst = eh->ether_dhost;
229 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
230 llc.llc_control = LLC_UI;
231 bcopy(at_org_code, llc.llc_snap_org_code,
233 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
235 mtod(m, caddr_t) + sizeof(struct ether_header),
237 eh->ether_type = htons(m->m_pkthdr.len);
238 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
240 eh->ether_type = htons(ETHERTYPE_AT);
242 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
251 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
252 eh->ether_type = 0x8137;
254 case 0x0: /* Novell 802.3 */
255 eh->ether_type = htons(m->m_pkthdr.len);
257 case 0xe0e0: /* Novell 802.2 and Token-Ring */
258 M_PREPEND(m, 3, MB_DONTWAIT);
259 eh = mtod(m, struct ether_header *);
260 edst = eh->ether_dhost;
261 eh->ether_type = htons(m->m_pkthdr.len);
262 cp = mtod(m, u_char *) + sizeof(struct ether_header);
268 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 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(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
277 m->m_pkthdr.rcvif = ifp;
278 netisr_dispatch(NETISR_NS, m);
281 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
282 m->m_flags |= M_BCAST;
285 case pseudo_AF_HDRCMPLT:
287 loop_copy = -1; /* if this is for us, don't do it */
288 deh = (struct ether_header *)dst->sa_data;
289 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
290 eh->ether_type = deh->ether_type;
294 printf("%s: can't handle af%d\n", ifp->if_xname,
296 gotoerr(EAFNOSUPPORT);
299 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
300 memcpy(eh->ether_shost,
301 ((struct ether_header *)dst->sa_data)->ether_shost,
304 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
307 * If a simplex interface, and the packet is being sent to our
308 * Ethernet address or a broadcast address, loopback a copy.
309 * XXX To make a simplex device behave exactly like a duplex
310 * device, we should copy in the case of sending to our own
311 * ethernet address (thus letting the original actually appear
312 * on the wire). However, we don't do that here for security
313 * reasons and compatibility with the original behavior.
315 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
318 if (m->m_pkthdr.csum_flags & CSUM_IP)
319 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
320 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
321 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
322 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
325 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
326 n->m_pkthdr.csum_flags |= csum_flags;
327 if (csum_flags & CSUM_DATA_VALID)
328 n->m_pkthdr.csum_data = 0xffff;
329 if_simloop(ifp, n, dst->sa_family, hlen);
332 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
333 ETHER_ADDR_LEN) == 0) {
334 m->m_pkthdr.csum_flags |= csum_flags;
335 if (csum_flags & CSUM_DATA_VALID)
336 m->m_pkthdr.csum_data = 0xffff;
337 if_simloop(ifp, m, dst->sa_family, hlen);
338 return (0); /* XXX */
342 /* Handle ng_ether(4) processing, if any */
343 if (ng_ether_output_p != NULL) {
344 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
350 /* Continue with link-layer output */
351 return ether_output_frame(ifp, m);
359 * Ethernet link layer output routine to send a raw frame to the device.
361 * This assumes that the 14 byte Ethernet header is present and contiguous
362 * in the first mbuf (if BRIDGE'ing).
365 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
367 struct ip_fw *rule = NULL;
369 struct altq_pktattr pktattr;
371 ASSERT_SERIALIZED(ifp->if_serializer);
373 /* Extract info from dummynet tag, ignore others */
374 while (m->m_type == MT_TAG) {
375 if (m->m_flags == PACKET_TAG_DUMMYNET) {
376 rule = ((struct dn_pkt *)m)->rule;
381 if (rule != NULL) /* packet was already bridged */
384 if (BDG_ACTIVE(ifp)) {
385 struct ether_header *eh; /* a pointer suffices */
387 m->m_pkthdr.rcvif = NULL;
388 eh = mtod(m, struct ether_header *);
389 m_adj(m, ETHER_HDR_LEN);
390 lwkt_serialize_exit(ifp->if_serializer);
391 m = bdg_forward_ptr(m, eh, ifp);
392 lwkt_serialize_enter(ifp->if_serializer);
398 if (ifq_is_enabled(&ifp->if_snd))
399 altq_etherclassify(&ifp->if_snd, m, &pktattr);
401 if (IPFW_LOADED && ether_ipfw != 0) {
402 struct ether_header save_eh, *eh;
404 eh = mtod(m, struct ether_header *);
406 m_adj(m, ETHER_HDR_LEN);
407 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) {
411 return ENOBUFS; /* pkt dropped */
413 return 0; /* consumed e.g. in a pipe */
415 eh = mtod(m, struct ether_header *);
416 /* packet was ok, restore the ethernet header */
417 if ((void *)(eh + 1) == (void *)m->m_data) {
418 m->m_data -= ETHER_HDR_LEN ;
419 m->m_len += ETHER_HDR_LEN ;
420 m->m_pkthdr.len += ETHER_HDR_LEN ;
422 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
423 if (m == NULL) /* nope... */ {
427 bcopy(&save_eh, mtod(m, struct ether_header *),
434 * Queue message on interface, update output statistics if
435 * successful, and start output if interface not yet active.
437 error = ifq_handoff(ifp, m, &pktattr);
442 * ipfw processing for ethernet packets (in and out).
443 * The second parameter is NULL from ether_demux(), and ifp from
444 * ether_output_frame(). This section of code could be used from
445 * bridge.c as well as long as we use some extra info
446 * to distinguish that case from ether_output_frame().
453 struct ether_header *eh,
456 struct ether_header save_eh = *eh; /* might be a ptr in m */
457 struct ip_fw_args args;
461 if (*rule != NULL && fw_one_pass)
462 return TRUE; /* dummynet packet, already partially processed */
465 * I need some amount of data to be contiguous, and in case others
466 * need the packet (shared==TRUE), it also better be in the first mbuf.
468 i = min((*m0)->m_pkthdr.len, max_protohdr);
469 if (shared || (*m0)->m_len < i) {
470 *m0 = m_pullup(*m0, i);
475 args.m = *m0; /* the packet we are looking at */
476 args.oif = dst; /* destination, if any */
477 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
478 m_tag_delete(*m0, mtag);
479 args.rule = *rule; /* matching rule to restart */
480 args.next_hop = NULL; /* we do not support forward yet */
481 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
482 i = ip_fw_chk_ptr(&args);
486 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
489 if (i == 0) /* a PASS rule. */
492 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
494 * Pass the pkt to dummynet, which consumes it.
495 * If shared, make a copy and keep the original.
500 m = m_copypacket(*m0, MB_DONTWAIT);
504 m = *m0 ; /* pass the original to dummynet */
505 *m0 = NULL ; /* and nothing back to the caller */
508 * Prepend the header, optimize for the common case of
509 * eh pointing into the mbuf.
511 if ((void *)(eh + 1) == (void *)m->m_data) {
512 m->m_data -= ETHER_HDR_LEN ;
513 m->m_len += ETHER_HDR_LEN ;
514 m->m_pkthdr.len += ETHER_HDR_LEN ;
516 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
519 bcopy(&save_eh, mtod(m, struct ether_header *),
522 ip_dn_io_ptr(m, (i & 0xffff),
523 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
527 * XXX at some point add support for divert/forward actions.
528 * If none of the above matches, we have to drop the pkt.
534 * XXX merge this function with ether_input.
537 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
539 ether_input(ifp, NULL, m);
543 * Process a received Ethernet packet. We have two different interfaces:
544 * one (conventional) assumes the packet in the mbuf, with the ethernet
545 * header provided separately in *eh. The second one (new) has everything
546 * in the mbuf, and we can tell it because eh == NULL.
547 * The caller MUST MAKE SURE that there are at least
548 * sizeof(struct ether_header) bytes in the first mbuf.
550 * This allows us to concentrate in one place a bunch of code which
551 * is replicated in all device drivers. Also, many functions called
552 * from ether_input() try to put the eh back into the mbuf, so we
553 * can later propagate the 'contiguous packet' interface to them,
554 * and handle the old interface just here.
556 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or
557 * cluster, right before m_data. So be very careful when working on m,
558 * as you could destroy *eh !!
560 * First we perform any link layer operations, then continue
561 * to the upper layers with ether_demux().
564 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
566 struct ether_header save_eh;
568 ASSERT_SERIALIZED(ifp->if_serializer);
571 if (m->m_len < sizeof(struct ether_header)) {
572 /* XXX error in the caller. */
576 m->m_pkthdr.rcvif = ifp;
577 eh = mtod(m, struct ether_header *);
578 m_adj(m, sizeof(struct ether_header));
580 /* m->m_pkthdr.len = m->m_len; */
584 bpf_ptap(ifp->if_bpf, m, eh, ETHER_HDR_LEN);
586 ifp->if_ibytes += m->m_pkthdr.len + (sizeof *eh);
588 /* Handle ng_ether(4) processing, if any */
589 if (ng_ether_input_p != NULL) {
590 lwkt_serialize_exit(ifp->if_serializer);
591 (*ng_ether_input_p)(ifp, &m, eh);
592 lwkt_serialize_enter(ifp->if_serializer);
597 /* Check for bridging mode */
598 if (BDG_ACTIVE(ifp)) {
601 /* Check with bridging code */
602 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) {
606 if (bif != BDG_LOCAL) {
607 save_eh = *eh ; /* because it might change */
608 lwkt_serialize_exit(ifp->if_serializer);
609 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */
610 lwkt_serialize_enter(ifp->if_serializer);
612 * Do not continue if bdg_forward_ptr() processed our
613 * packet (and cleared the mbuf pointer m) or if
614 * it dropped (m_free'd) the packet itself.
617 if (bif == BDG_BCAST || bif == BDG_MCAST)
618 printf("bdg_forward drop MULTICAST PKT\n");
623 if (bif == BDG_LOCAL || bif == BDG_BCAST || bif == BDG_MCAST)
624 goto recvLocal; /* receive locally */
626 /* If not local and not multicast, just drop it */
632 /* Continue with upper layer processing */
633 ether_demux(ifp, eh, m);
637 * Upper layer processing for a received Ethernet packet.
640 ether_demux(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
644 struct ip_fw *rule = NULL;
649 /* Extract info from dummynet tag, ignore others */
650 while (m->m_type == MT_TAG) {
651 if (m->m_flags == PACKET_TAG_DUMMYNET) {
652 rule = ((struct dn_pkt *)m)->rule;
653 ifp = m->m_next->m_pkthdr.rcvif;
658 if (rule) /* packet was already bridged */
662 * Discard packet if upper layers shouldn't see it because
663 * it was unicast to a different Ethernet address. If the
664 * driver is working properly, then this situation can only
665 * happen when the interface is in promiscuous mode.
667 if (!BDG_ACTIVE(ifp) &&
668 ((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
669 (eh->ether_dhost[0] & 1) == 0 &&
670 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
674 /* Discard packet if interface is not up */
675 if (!(ifp->if_flags & IFF_UP)) {
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;
689 if (IPFW_LOADED && ether_ipfw != 0) {
690 if (!ether_ipfw_chk(&m, NULL, &rule, eh, FALSE)) {
694 eh = mtod(m, struct ether_header *);
697 ether_type = ntohs(eh->ether_type);
699 switch (ether_type) {
702 if (ipflow_fastforward(m, ifp->if_serializer))
708 if (ifp->if_flags & IFF_NOARP) {
709 /* Discard packet if ARP is disabled on interface */
725 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
732 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
748 if (vlan_input_p != NULL)
749 (*vlan_input_p)(eh, m);
751 m->m_pkthdr.rcvif->if_noproto++;
758 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
762 checksum = mtod(m, ushort *);
764 if ((ether_type <= ETHERMTU) &&
765 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
766 if (*checksum == 0xE0E0) {
767 m->m_pkthdr.len -= 3;
776 if (ether_type > ETHERMTU)
778 l = mtod(m, struct llc *);
779 if (l->llc_dsap == LLC_SNAP_LSAP &&
780 l->llc_ssap == LLC_SNAP_LSAP &&
781 l->llc_control == LLC_UI) {
782 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
783 sizeof at_org_code) == 0 &&
784 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
785 m_adj(m, sizeof(struct llc));
789 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
790 sizeof aarp_org_code) == 0 &&
791 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
792 m_adj(m, sizeof(struct llc));
799 if (ng_ether_input_orphan_p != NULL)
800 (*ng_ether_input_orphan_p)(ifp, m, eh);
805 netisr_dispatch(isr, m);
809 * Perform common duties while attaching to interface list
813 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
815 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
820 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
821 lwkt_serialize_t serializer)
823 struct sockaddr_dl *sdl;
825 ifp->if_type = IFT_ETHER;
826 ifp->if_addrlen = ETHER_ADDR_LEN;
827 ifp->if_hdrlen = ETHER_HDR_LEN;
828 if_attach(ifp, serializer);
829 ifp->if_mtu = ETHERMTU;
830 if (ifp->if_baudrate == 0)
831 ifp->if_baudrate = 10000000;
832 ifp->if_output = ether_output;
833 ifp->if_input = ether_input_internal;
834 ifp->if_resolvemulti = ether_resolvemulti;
835 ifp->if_broadcastaddr = etherbroadcastaddr;
836 sdl = IF_LLSOCKADDR(ifp);
837 sdl->sdl_type = IFT_ETHER;
838 sdl->sdl_alen = ifp->if_addrlen;
839 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
841 * XXX Keep the current drivers happy.
842 * XXX Remove once all drivers have been cleaned up
844 if (lla != IFP2AC(ifp)->ac_enaddr)
845 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
846 bpfattach(ifp, dlt, hdrlen);
847 if (ng_ether_attach_p != NULL)
848 (*ng_ether_attach_p)(ifp);
852 if_printf(ifp, "MAC address: %6D\n", lla, ":");
856 * Perform common duties while detaching an Ethernet interface
859 ether_ifdetach(struct ifnet *ifp)
863 if (ng_ether_detach_p != NULL)
864 (*ng_ether_detach_p)(ifp);
872 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
874 struct ifaddr *ifa = (struct ifaddr *) data;
875 struct ifreq *ifr = (struct ifreq *) data;
878 ASSERT_SERIALIZED(ifp->if_serializer);
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))
901 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
903 bcopy(ina->x_host.c_host, ac->ac_enaddr,
904 sizeof ac->ac_enaddr);
906 ifp->if_init(ifp->if_softc); /* Set new address. */
912 * XXX - This code is probably wrong
916 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
917 struct arpcom *ac = IFP2AC(ifp);
919 if (ns_nullhost(*ina))
920 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
922 bcopy(ina->x_host.c_host, ac->ac_enaddr,
923 sizeof ac->ac_enaddr);
928 ifp->if_init(ifp->if_softc);
933 ifp->if_init(ifp->if_softc);
939 bcopy(IFP2AC(ifp)->ac_enaddr,
940 ((struct sockaddr *)ifr->ifr_data)->sa_data,
946 * Set the interface MTU.
948 if (ifr->ifr_mtu > ETHERMTU) {
951 ifp->if_mtu = ifr->ifr_mtu;
964 struct sockaddr **llsa,
967 struct sockaddr_dl *sdl;
968 struct sockaddr_in *sin;
970 struct sockaddr_in6 *sin6;
974 switch(sa->sa_family) {
977 * No mapping needed. Just check that it's a valid MC address.
979 sdl = (struct sockaddr_dl *)sa;
980 e_addr = LLADDR(sdl);
981 if ((e_addr[0] & 1) != 1)
982 return EADDRNOTAVAIL;
988 sin = (struct sockaddr_in *)sa;
989 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
990 return EADDRNOTAVAIL;
991 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
993 sdl->sdl_len = sizeof *sdl;
994 sdl->sdl_family = AF_LINK;
995 sdl->sdl_index = ifp->if_index;
996 sdl->sdl_type = IFT_ETHER;
997 sdl->sdl_alen = ETHER_ADDR_LEN;
998 e_addr = LLADDR(sdl);
999 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1000 *llsa = (struct sockaddr *)sdl;
1005 sin6 = (struct sockaddr_in6 *)sa;
1006 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1008 * An IP6 address of 0 means listen to all
1009 * of the Ethernet multicast address used for IP6.
1010 * (This is used for multicast routers.)
1012 ifp->if_flags |= IFF_ALLMULTI;
1016 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1017 return EADDRNOTAVAIL;
1018 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1020 sdl->sdl_len = sizeof *sdl;
1021 sdl->sdl_family = AF_LINK;
1022 sdl->sdl_index = ifp->if_index;
1023 sdl->sdl_type = IFT_ETHER;
1024 sdl->sdl_alen = ETHER_ADDR_LEN;
1025 e_addr = LLADDR(sdl);
1026 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1027 *llsa = (struct sockaddr *)sdl;
1033 * Well, the text isn't quite right, but it's the name
1036 return EAFNOSUPPORT;
1042 * This is for reference. We have a table-driven version
1043 * of the little-endian crc32 generator, which is faster
1044 * than the double-loop.
1047 ether_crc32_le(const uint8_t *buf, size_t len)
1049 uint32_t c, crc, carry;
1052 crc = 0xffffffffU; /* initial value */
1054 for (i = 0; i < len; i++) {
1056 for (j = 0; j < 8; j++) {
1057 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1061 crc = (crc ^ ETHER_CRC_POLY_LE);
1069 ether_crc32_le(const uint8_t *buf, size_t len)
1071 static const uint32_t crctab[] = {
1072 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1073 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1074 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1075 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1080 crc = 0xffffffffU; /* initial value */
1082 for (i = 0; i < len; i++) {
1084 crc = (crc >> 4) ^ crctab[crc & 0xf];
1085 crc = (crc >> 4) ^ crctab[crc & 0xf];
1093 ether_crc32_be(const uint8_t *buf, size_t len)
1095 uint32_t c, crc, carry;
1098 crc = 0xffffffffU; /* initial value */
1100 for (i = 0; i < len; i++) {
1102 for (j = 0; j < 8; j++) {
1103 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1107 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1115 * find the size of ethernet header, and call classifier
1118 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1119 struct altq_pktattr *pktattr)
1121 struct ether_header *eh;
1122 uint16_t ether_type;
1123 int hlen, af, hdrsize;
1126 hlen = sizeof(struct ether_header);
1127 eh = mtod(m, struct ether_header *);
1129 ether_type = ntohs(eh->ether_type);
1130 if (ether_type < ETHERMTU) {
1132 struct llc *llc = (struct llc *)(eh + 1);
1135 if (m->m_len < hlen ||
1136 llc->llc_dsap != LLC_SNAP_LSAP ||
1137 llc->llc_ssap != LLC_SNAP_LSAP ||
1138 llc->llc_control != LLC_UI)
1139 goto bad; /* not snap! */
1141 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1144 if (ether_type == ETHERTYPE_IP) {
1146 hdrsize = 20; /* sizeof(struct ip) */
1148 } else if (ether_type == ETHERTYPE_IPV6) {
1150 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1155 while (m->m_len <= hlen) {
1159 hdr = m->m_data + hlen;
1160 if (m->m_len < hlen + hdrsize) {
1162 * ip header is not in a single mbuf. this should not
1163 * happen in the current code.
1164 * (todo: use m_pulldown in the future)
1170 ifq_classify(ifq, m, af, pktattr);
1177 pktattr->pattr_class = NULL;
1178 pktattr->pattr_hdr = NULL;
1179 pktattr->pattr_af = AF_UNSPEC;