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 1.55 2008/03/20 10:42:15 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, struct mbuf **mp);
109 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
110 struct mbuf *m, const struct ether_header *eh);
111 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
112 void (*ng_ether_attach_p)(struct ifnet *ifp);
113 void (*ng_ether_detach_p)(struct ifnet *ifp);
115 int (*vlan_input_p)(const struct ether_header *eh, struct mbuf *m);
116 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t);
118 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
120 static void ether_restore_header(struct mbuf **, const struct ether_header *,
121 const struct ether_header *);
126 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
127 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
128 struct sockaddr *, struct rtentry *);
129 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
131 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
134 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
135 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
138 #define gotoerr(e) do { error = (e); goto bad; } while (0)
139 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
141 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
143 const struct ether_header *eh,
146 static int ether_ipfw;
147 static u_int ether_restore_hdr;
148 static u_int ether_prepend_hdr;
150 SYSCTL_DECL(_net_link);
151 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
152 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
153 ðer_ipfw, 0, "Pass ether pkts through firewall");
154 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW,
155 ðer_restore_hdr, 0, "# of ether header restoration");
156 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW,
157 ðer_prepend_hdr, 0,
158 "# of ether header restoration which prepends mbuf");
161 * Ethernet output routine.
162 * Encapsulate a packet of type family for the local net.
163 * Use trailer local net encapsulation if enough data in first
164 * packet leaves a multiple of 512 bytes of data in remainder.
165 * Assumes that ifp is actually pointer to arpcom structure.
168 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
171 struct ether_header *eh, *deh;
174 int hlen = ETHER_HDR_LEN; /* link layer header length */
175 struct arpcom *ac = IFP2AC(ifp);
178 ASSERT_SERIALIZED(ifp->if_serializer);
180 if (ifp->if_flags & IFF_MONITOR)
182 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
185 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
188 eh = mtod(m, struct ether_header *);
189 edst = eh->ether_dhost;
192 * Fill in the destination ethernet address and frame type.
194 switch (dst->sa_family) {
197 if (!arpresolve(ifp, rt, m, dst, edst))
198 return (0); /* if not yet resolved */
199 eh->ether_type = htons(ETHERTYPE_IP);
204 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
205 return (0); /* Something bad happenned. */
206 eh->ether_type = htons(ETHERTYPE_IPV6);
211 if (ef_outputp != NULL) {
212 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
217 eh->ether_type = htons(ETHERTYPE_IPX);
218 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
219 edst, ETHER_ADDR_LEN);
225 struct at_ifaddr *aa;
227 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
232 * In the phase 2 case, need to prepend an mbuf for
233 * the llc header. Since we must preserve the value
234 * of m, which is passed to us by value, we m_copy()
235 * the first mbuf, and use it for our llc header.
237 if (aa->aa_flags & AFA_PHASE2) {
240 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
241 eh = mtod(m, struct ether_header *);
242 edst = eh->ether_dhost;
243 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
244 llc.llc_control = LLC_UI;
245 bcopy(at_org_code, llc.llc_snap_org_code,
247 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
249 mtod(m, caddr_t) + sizeof(struct ether_header),
251 eh->ether_type = htons(m->m_pkthdr.len);
252 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
254 eh->ether_type = htons(ETHERTYPE_AT);
256 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
265 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
266 eh->ether_type = 0x8137;
268 case 0x0: /* Novell 802.3 */
269 eh->ether_type = htons(m->m_pkthdr.len);
271 case 0xe0e0: /* Novell 802.2 and Token-Ring */
272 M_PREPEND(m, 3, MB_DONTWAIT);
273 eh = mtod(m, struct ether_header *);
274 edst = eh->ether_dhost;
275 eh->ether_type = htons(m->m_pkthdr.len);
276 cp = mtod(m, u_char *) + sizeof(struct ether_header);
282 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
285 * XXX if ns_thishost is the same as the node's ethernet
286 * address then just the default code will catch this anyhow.
287 * So I'm not sure if this next clause should be here at all?
290 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
291 m->m_pkthdr.rcvif = ifp;
292 netisr_dispatch(NETISR_NS, m);
295 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
296 m->m_flags |= M_BCAST;
299 case pseudo_AF_HDRCMPLT:
301 loop_copy = -1; /* if this is for us, don't do it */
302 deh = (struct ether_header *)dst->sa_data;
303 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
304 eh->ether_type = deh->ether_type;
308 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
309 gotoerr(EAFNOSUPPORT);
312 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
313 memcpy(eh->ether_shost,
314 ((struct ether_header *)dst->sa_data)->ether_shost,
317 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
320 * Bridges require special output handling.
322 if (ifp->if_bridge) {
323 KASSERT(bridge_output_p != NULL,
324 ("%s: if_bridge not loaded!", __func__));
325 return ((*bridge_output_p)(ifp, m, NULL, NULL));
329 * If a simplex interface, and the packet is being sent to our
330 * Ethernet address or a broadcast address, loopback a copy.
331 * XXX To make a simplex device behave exactly like a duplex
332 * device, we should copy in the case of sending to our own
333 * ethernet address (thus letting the original actually appear
334 * on the wire). However, we don't do that here for security
335 * reasons and compatibility with the original behavior.
337 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
340 if (m->m_pkthdr.csum_flags & CSUM_IP)
341 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
342 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
343 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
344 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
347 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
348 n->m_pkthdr.csum_flags |= csum_flags;
349 if (csum_flags & CSUM_DATA_VALID)
350 n->m_pkthdr.csum_data = 0xffff;
351 if_simloop(ifp, n, dst->sa_family, hlen);
354 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
355 ETHER_ADDR_LEN) == 0) {
356 m->m_pkthdr.csum_flags |= csum_flags;
357 if (csum_flags & CSUM_DATA_VALID)
358 m->m_pkthdr.csum_data = 0xffff;
359 if_simloop(ifp, m, dst->sa_family, hlen);
360 return (0); /* XXX */
365 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
370 /* Handle ng_ether(4) processing, if any */
371 if (ng_ether_output_p != NULL) {
372 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
378 /* Continue with link-layer output */
379 return ether_output_frame(ifp, m);
387 * Ethernet link layer output routine to send a raw frame to the device.
389 * This assumes that the 14 byte Ethernet header is present and contiguous
393 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
395 struct ip_fw *rule = NULL;
397 struct altq_pktattr pktattr;
400 ASSERT_SERIALIZED(ifp->if_serializer);
402 /* Extract info from dummynet tag */
403 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
405 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
407 m_tag_delete(m, mtag);
411 if (ifq_is_enabled(&ifp->if_snd))
412 altq_etherclassify(&ifp->if_snd, m, &pktattr);
414 if (IPFW_LOADED && ether_ipfw != 0) {
415 struct ether_header save_eh, *eh;
417 eh = mtod(m, struct ether_header *);
419 m_adj(m, ETHER_HDR_LEN);
420 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) {
424 return ENOBUFS; /* pkt dropped */
426 return 0; /* consumed e.g. in a pipe */
429 /* packet was ok, restore the ethernet header */
430 ether_restore_header(&m, eh, &save_eh);
439 * Queue message on interface, update output statistics if
440 * successful, and start output if interface not yet active.
442 error = ifq_handoff(ifp, m, &pktattr);
447 * ipfw processing for ethernet packets (in and out).
448 * The second parameter is NULL from ether_demux(), and ifp from
449 * ether_output_frame().
456 const struct ether_header *eh,
459 struct ether_header save_eh = *eh; /* might be a ptr in m */
460 struct ip_fw_args args;
464 if (*rule != NULL && fw_one_pass)
465 return TRUE; /* dummynet packet, already partially processed */
468 * I need some amount of data to be contiguous, and in case others
469 * need the packet (shared==TRUE), it also better be in the first mbuf.
471 i = min((*m0)->m_pkthdr.len, max_protohdr);
472 if (shared || (*m0)->m_len < i) {
473 *m0 = m_pullup(*m0, i);
478 args.m = *m0; /* the packet we are looking at */
479 args.oif = dst; /* destination, if any */
480 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
481 m_tag_delete(*m0, mtag);
482 args.rule = *rule; /* matching rule to restart */
483 args.next_hop = NULL; /* we do not support forward yet */
484 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
485 i = ip_fw_chk_ptr(&args);
489 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
492 if (i == 0) /* a PASS rule. */
495 if (i & IP_FW_PORT_DYNT_FLAG) {
497 * Pass the pkt to dummynet, which consumes it.
498 * If shared, make a copy and keep the original.
503 m = m_copypacket(*m0, MB_DONTWAIT);
507 m = *m0 ; /* pass the original to dummynet */
508 *m0 = NULL ; /* and nothing back to the caller */
511 ether_restore_header(&m, eh, &save_eh);
515 ip_fw_dn_io_ptr(m, (i & 0xffff),
516 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
520 * XXX at some point add support for divert/forward actions.
521 * If none of the above matches, we have to drop the pkt.
527 * Process a received Ethernet packet.
529 * The ethernet header is assumed to be in the mbuf so the caller
530 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
531 * bytes in the first mbuf.
533 * This allows us to concentrate in one place a bunch of code which
534 * is replicated in all device drivers. Also, many functions called
535 * from ether_input() try to put the eh back into the mbuf, so we
536 * can later propagate the 'contiguous packet' interface to them.
538 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
539 * cluster, right before m_data. So be very careful when working on m,
540 * as you could destroy *eh !!
542 * First we perform any link layer operations, then continue to the
543 * upper layers with ether_demux().
546 ether_input(struct ifnet *ifp, struct mbuf *m)
548 struct ether_header *eh;
550 ASSERT_SERIALIZED(ifp->if_serializer);
553 /* Discard packet if interface is not up */
554 if (!(ifp->if_flags & IFF_UP)) {
559 if (m->m_len < sizeof(struct ether_header)) {
560 /* XXX error in the caller. */
564 eh = mtod(m, struct ether_header *);
566 m->m_pkthdr.rcvif = ifp;
568 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
569 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
570 ifp->if_addrlen) == 0)
571 m->m_flags |= M_BCAST;
573 m->m_flags |= M_MCAST;
579 ifp->if_ibytes += m->m_pkthdr.len;
581 if (ifp->if_flags & IFF_MONITOR) {
583 * Interface marked for monitoring; discard packet.
590 * Tap the packet off here for a bridge. bridge_input()
591 * will return NULL if it has consumed the packet, otherwise
592 * it gets processed as normal. Note that bridge_input()
593 * will always return the original packet if we need to
594 * process it locally.
596 if (ifp->if_bridge) {
597 KASSERT(bridge_input_p != NULL,
598 ("%s: if_bridge not loaded!", __func__));
600 if(m->m_flags & M_PROTO1) {
601 m->m_flags &= ~M_PROTO1;
603 /* clear M_PROMISC, in case the packets comes from a vlan */
604 /* m->m_flags &= ~M_PROMISC; */
605 lwkt_serialize_exit(ifp->if_serializer);
606 m = (*bridge_input_p)(ifp, m);
607 lwkt_serialize_enter(ifp->if_serializer);
611 KASSERT(ifp == m->m_pkthdr.rcvif,
612 ("bridge_input_p changed rcvif\n"));
614 /* 'm' may be changed by bridge_input_p() */
615 eh = mtod(m, struct ether_header *);
619 /* Handle ng_ether(4) processing, if any */
620 if (ng_ether_input_p != NULL) {
621 ng_ether_input_p(ifp, &m);
625 /* 'm' may be changed by ng_ether_input_p() */
626 eh = mtod(m, struct ether_header *);
629 /* XXX old crufty stuff, needs to be removed */
630 m_adj(m, sizeof(struct ether_header));
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 *eh0, struct mbuf *m)
642 struct ether_header eh;
645 struct ip_fw *rule = NULL;
653 /* Extract info from dummynet tag */
654 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
656 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
657 KKASSERT(ifp == NULL);
658 ifp = m->m_pkthdr.rcvif;
660 m_tag_delete(m, mtag);
663 if (rule) /* packet is passing the second time */
668 * XXX: Okay, we need to call carp_forus() and - if it is for
669 * us jump over code that does the normal check
670 * "ac_enaddr == ether_dhost". The check sequence is a bit
671 * different from OpenBSD, so we jump over as few code as
672 * possible, to catch _all_ sanity checks. This needs
673 * evaluation, to see if the carp ether_dhost values break any
676 if (ifp->if_carp && carp_forus(ifp->if_carp, eh.ether_dhost))
681 * Discard packet if upper layers shouldn't see it because
682 * it was unicast to a different Ethernet address. If the
683 * driver is working properly, then this situation can only
684 * happen when the interface is in promiscuous mode.
686 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
687 (eh.ether_dhost[0] & 1) == 0 &&
688 bcmp(eh.ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
694 if (IPFW_LOADED && ether_ipfw != 0) {
695 if (!ether_ipfw_chk(&m, NULL, &rule, &eh, FALSE)) {
701 ether_type = ntohs(eh.ether_type);
703 switch (ether_type) {
706 if (ipflow_fastforward(m, ifp->if_serializer))
712 if (ifp->if_flags & IFF_NOARP) {
713 /* Discard packet if ARP is disabled on interface */
729 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0)
736 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
752 if (vlan_input_p != NULL)
753 (*vlan_input_p)(&eh, m);
755 m->m_pkthdr.rcvif->if_noproto++;
762 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0)
766 checksum = mtod(m, ushort *);
768 if ((ether_type <= ETHERMTU) &&
769 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
770 if (*checksum == 0xE0E0) {
771 m->m_pkthdr.len -= 3;
780 if (ether_type > ETHERMTU)
782 l = mtod(m, struct llc *);
783 if (l->llc_dsap == LLC_SNAP_LSAP &&
784 l->llc_ssap == LLC_SNAP_LSAP &&
785 l->llc_control == LLC_UI) {
786 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
787 sizeof at_org_code) == 0 &&
788 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
789 m_adj(m, sizeof(struct llc));
793 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
794 sizeof aarp_org_code) == 0 &&
795 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
796 m_adj(m, sizeof(struct llc));
803 if (ng_ether_input_orphan_p != NULL)
804 (*ng_ether_input_orphan_p)(ifp, m, &eh);
809 netisr_dispatch(isr, m);
813 * Perform common duties while attaching to interface list
817 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
819 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
824 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
825 lwkt_serialize_t serializer)
827 struct sockaddr_dl *sdl;
829 ifp->if_type = IFT_ETHER;
830 ifp->if_addrlen = ETHER_ADDR_LEN;
831 ifp->if_hdrlen = ETHER_HDR_LEN;
832 if_attach(ifp, serializer);
833 ifp->if_mtu = ETHERMTU;
834 if (ifp->if_baudrate == 0)
835 ifp->if_baudrate = 10000000;
836 ifp->if_output = ether_output;
837 ifp->if_input = ether_input;
838 ifp->if_resolvemulti = ether_resolvemulti;
839 ifp->if_broadcastaddr = etherbroadcastaddr;
840 sdl = IF_LLSOCKADDR(ifp);
841 sdl->sdl_type = IFT_ETHER;
842 sdl->sdl_alen = ifp->if_addrlen;
843 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
845 * XXX Keep the current drivers happy.
846 * XXX Remove once all drivers have been cleaned up
848 if (lla != IFP2AC(ifp)->ac_enaddr)
849 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
850 bpfattach(ifp, dlt, hdrlen);
851 if (ng_ether_attach_p != NULL)
852 (*ng_ether_attach_p)(ifp);
854 if_printf(ifp, "MAC address: %6D\n", lla, ":");
858 * Perform common duties while detaching an Ethernet interface
861 ether_ifdetach(struct ifnet *ifp)
865 if (ng_ether_detach_p != NULL)
866 (*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 #define IF_INIT(ifp) \
880 if (((ifp)->if_flags & IFF_UP) == 0) { \
881 (ifp)->if_flags |= IFF_UP; \
882 (ifp)->if_init((ifp)->if_softc); \
886 ASSERT_SERIALIZED(ifp->if_serializer);
890 switch (ifa->ifa_addr->sa_family) {
893 IF_INIT(ifp); /* before arpwhohas */
894 arp_ifinit(ifp, ifa);
899 * XXX - This code is probably wrong
903 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
904 struct arpcom *ac = IFP2AC(ifp);
906 if (ipx_nullhost(*ina))
907 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
909 bcopy(ina->x_host.c_host, ac->ac_enaddr,
910 sizeof ac->ac_enaddr);
912 IF_INIT(ifp); /* Set new address. */
918 * XXX - This code is probably wrong
922 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
923 struct arpcom *ac = IFP2AC(ifp);
925 if (ns_nullhost(*ina))
926 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
928 bcopy(ina->x_host.c_host, ac->ac_enaddr,
929 sizeof ac->ac_enaddr);
945 bcopy(IFP2AC(ifp)->ac_enaddr,
946 ((struct sockaddr *)ifr->ifr_data)->sa_data,
952 * Set the interface MTU.
954 if (ifr->ifr_mtu > ETHERMTU) {
957 ifp->if_mtu = ifr->ifr_mtu;
972 struct sockaddr **llsa,
975 struct sockaddr_dl *sdl;
976 struct sockaddr_in *sin;
978 struct sockaddr_in6 *sin6;
982 switch(sa->sa_family) {
985 * No mapping needed. Just check that it's a valid MC address.
987 sdl = (struct sockaddr_dl *)sa;
988 e_addr = LLADDR(sdl);
989 if ((e_addr[0] & 1) != 1)
990 return EADDRNOTAVAIL;
996 sin = (struct sockaddr_in *)sa;
997 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
998 return EADDRNOTAVAIL;
999 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1001 sdl->sdl_len = sizeof *sdl;
1002 sdl->sdl_family = AF_LINK;
1003 sdl->sdl_index = ifp->if_index;
1004 sdl->sdl_type = IFT_ETHER;
1005 sdl->sdl_alen = ETHER_ADDR_LEN;
1006 e_addr = LLADDR(sdl);
1007 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1008 *llsa = (struct sockaddr *)sdl;
1013 sin6 = (struct sockaddr_in6 *)sa;
1014 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1016 * An IP6 address of 0 means listen to all
1017 * of the Ethernet multicast address used for IP6.
1018 * (This is used for multicast routers.)
1020 ifp->if_flags |= IFF_ALLMULTI;
1024 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1025 return EADDRNOTAVAIL;
1026 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1028 sdl->sdl_len = sizeof *sdl;
1029 sdl->sdl_family = AF_LINK;
1030 sdl->sdl_index = ifp->if_index;
1031 sdl->sdl_type = IFT_ETHER;
1032 sdl->sdl_alen = ETHER_ADDR_LEN;
1033 e_addr = LLADDR(sdl);
1034 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1035 *llsa = (struct sockaddr *)sdl;
1041 * Well, the text isn't quite right, but it's the name
1044 return EAFNOSUPPORT;
1050 * This is for reference. We have a table-driven version
1051 * of the little-endian crc32 generator, which is faster
1052 * than the double-loop.
1055 ether_crc32_le(const uint8_t *buf, size_t len)
1057 uint32_t c, crc, carry;
1060 crc = 0xffffffffU; /* initial value */
1062 for (i = 0; i < len; i++) {
1064 for (j = 0; j < 8; j++) {
1065 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1069 crc = (crc ^ ETHER_CRC_POLY_LE);
1077 ether_crc32_le(const uint8_t *buf, size_t len)
1079 static const uint32_t crctab[] = {
1080 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1081 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1082 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1083 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1088 crc = 0xffffffffU; /* initial value */
1090 for (i = 0; i < len; i++) {
1092 crc = (crc >> 4) ^ crctab[crc & 0xf];
1093 crc = (crc >> 4) ^ crctab[crc & 0xf];
1101 ether_crc32_be(const uint8_t *buf, size_t len)
1103 uint32_t c, crc, carry;
1106 crc = 0xffffffffU; /* initial value */
1108 for (i = 0; i < len; i++) {
1110 for (j = 0; j < 8; j++) {
1111 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1115 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1123 * find the size of ethernet header, and call classifier
1126 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1127 struct altq_pktattr *pktattr)
1129 struct ether_header *eh;
1130 uint16_t ether_type;
1131 int hlen, af, hdrsize;
1134 hlen = sizeof(struct ether_header);
1135 eh = mtod(m, struct ether_header *);
1137 ether_type = ntohs(eh->ether_type);
1138 if (ether_type < ETHERMTU) {
1140 struct llc *llc = (struct llc *)(eh + 1);
1143 if (m->m_len < hlen ||
1144 llc->llc_dsap != LLC_SNAP_LSAP ||
1145 llc->llc_ssap != LLC_SNAP_LSAP ||
1146 llc->llc_control != LLC_UI)
1147 goto bad; /* not snap! */
1149 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1152 if (ether_type == ETHERTYPE_IP) {
1154 hdrsize = 20; /* sizeof(struct ip) */
1156 } else if (ether_type == ETHERTYPE_IPV6) {
1158 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1163 while (m->m_len <= hlen) {
1167 hdr = m->m_data + hlen;
1168 if (m->m_len < hlen + hdrsize) {
1170 * ip header is not in a single mbuf. this should not
1171 * happen in the current code.
1172 * (todo: use m_pulldown in the future)
1178 ifq_classify(ifq, m, af, pktattr);
1185 pktattr->pattr_class = NULL;
1186 pktattr->pattr_hdr = NULL;
1187 pktattr->pattr_af = AF_UNSPEC;
1191 ether_restore_header(struct mbuf **m0, const struct ether_header *eh,
1192 const struct ether_header *save_eh)
1194 struct mbuf *m = *m0;
1196 ether_restore_hdr++;
1199 * Prepend the header, optimize for the common case of
1200 * eh pointing into the mbuf.
1202 if ((const void *)(eh + 1) == (void *)m->m_data) {
1203 m->m_data -= ETHER_HDR_LEN;
1204 m->m_len += ETHER_HDR_LEN;
1205 m->m_pkthdr.len += ETHER_HDR_LEN;
1207 ether_prepend_hdr++;
1209 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
1211 bcopy(save_eh, mtod(m, struct ether_header *),