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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
33 #include "opt_atalk.h"
35 #include "opt_inet6.h"
38 #include "opt_netgraph.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
47 #include <sys/random.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/sysctl.h>
53 #include <net/if_arp.h>
54 #include <net/netisr.h>
55 #include <net/route.h>
56 #include <net/if_llc.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
60 #include <net/ethernet.h>
61 #include <net/if_bridgevar.h>
62 #include <net/if_vlan_var.h>
63 #include <net/pf_mtag.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 <netinet/ip_fw.h>
70 #include <netinet/ip_dummynet.h>
73 #include <netinet6/nd6.h>
77 #include <netinet/ip_carp.h>
81 #include <netipx/ipx.h>
82 #include <netipx/ipx_if.h>
84 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
85 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
86 struct sockaddr *dst, short *tp, int *hlen);
89 #include <netatalk/at.h>
90 #include <netatalk/at_var.h>
91 #include <netatalk/at_extern.h>
93 #define llc_snap_org_code llc_un.type_snap.org_code
94 #define llc_snap_ether_type llc_un.type_snap.ether_type
96 extern u_char at_org_code[3];
97 extern u_char aarp_org_code[3];
100 #include <security/mac/mac_framework.h>
102 /* netgraph node hooks for ng_ether(4) */
103 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
104 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
105 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
106 void (*ng_ether_attach_p)(struct ifnet *ifp);
107 void (*ng_ether_detach_p)(struct ifnet *ifp);
109 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
111 /* if_bridge(4) support */
112 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
113 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
114 struct sockaddr *, struct rtentry *);
115 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
117 /* if_lagg(4) support */
118 struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
120 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
121 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
123 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
126 /* XXX: should be in an arp support file, not here */
127 MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
129 #define ETHER_IS_BROADCAST(addr) \
130 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
132 #define senderr(e) do { error = (e); goto bad;} while (0)
134 #if defined(INET) || defined(INET6)
136 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
137 struct ip_fw **rule, int shared);
138 static int ether_ipfw;
142 * Ethernet output routine.
143 * Encapsulate a packet of type family for the local net.
144 * Use trailer local net encapsulation if enough data in first
145 * packet leaves a multiple of 512 bytes of data in remainder.
148 ether_output(struct ifnet *ifp, struct mbuf *m,
149 struct sockaddr *dst, struct rtentry *rt0)
152 int error, hdrcmplt = 0;
153 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
154 struct ether_header *eh;
157 int hlen; /* link layer header length */
160 error = mac_check_ifnet_transmit(ifp, m);
165 if (ifp->if_flags & IFF_MONITOR)
167 if (!((ifp->if_flags & IFF_UP) &&
168 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
171 hlen = ETHER_HDR_LEN;
172 switch (dst->sa_family) {
175 error = arpresolve(ifp, rt0, m, dst, edst);
177 return (error == EWOULDBLOCK ? 0 : error);
178 type = htons(ETHERTYPE_IP);
183 ah = mtod(m, struct arphdr *);
184 ah->ar_hrd = htons(ARPHRD_ETHER);
186 loop_copy = 0; /* if this is for us, don't do it */
188 switch(ntohs(ah->ar_op)) {
189 case ARPOP_REVREQUEST:
191 type = htons(ETHERTYPE_REVARP);
196 type = htons(ETHERTYPE_ARP);
200 if (m->m_flags & M_BCAST)
201 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
203 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
210 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst);
213 type = htons(ETHERTYPE_IPV6);
219 error = ef_outputp(ifp, &m, dst, &type, &hlen);
223 type = htons(ETHERTYPE_IPX);
224 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
225 (caddr_t)edst, sizeof (edst));
231 struct at_ifaddr *aa;
233 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
234 senderr(EHOSTUNREACH); /* XXX */
235 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst))
238 * In the phase 2 case, need to prepend an mbuf for the llc header.
240 if ( aa->aa_flags & AFA_PHASE2 ) {
243 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
246 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
247 llc.llc_control = LLC_UI;
248 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
249 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
250 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
251 type = htons(m->m_pkthdr.len);
252 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
254 type = htons(ETHERTYPE_AT);
258 #endif /* NETATALK */
260 case pseudo_AF_HDRCMPLT:
262 eh = (struct ether_header *)dst->sa_data;
263 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
267 loop_copy = 0; /* if this is for us, don't do it */
268 eh = (struct ether_header *)dst->sa_data;
269 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
270 type = eh->ether_type;
274 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
275 senderr(EAFNOSUPPORT);
279 * Add local net header. If no space in first mbuf,
282 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
285 eh = mtod(m, struct ether_header *);
286 (void)memcpy(&eh->ether_type, &type,
287 sizeof(eh->ether_type));
288 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
290 (void)memcpy(eh->ether_shost, esrc,
291 sizeof(eh->ether_shost));
293 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
294 sizeof(eh->ether_shost));
297 * If a simplex interface, and the packet is being sent to our
298 * Ethernet address or a broadcast address, loopback a copy.
299 * XXX To make a simplex device behave exactly like a duplex
300 * device, we should copy in the case of sending to our own
301 * ethernet address (thus letting the original actually appear
302 * on the wire). However, we don't do that here for security
303 * reasons and compatibility with the original behavior.
305 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
306 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
309 if (m->m_pkthdr.csum_flags & CSUM_IP)
310 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
311 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
312 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
314 if (m->m_flags & M_BCAST) {
318 * Because if_simloop() modifies the packet, we need a
319 * writable copy through m_dup() instead of a readonly
320 * one as m_copy[m] would give us. The alternative would
321 * be to modify if_simloop() to handle the readonly mbuf,
322 * but performancewise it is mostly equivalent (trading
323 * extra data copying vs. extra locking).
325 * XXX This is a local workaround. A number of less
326 * often used kernel parts suffer from the same bug.
327 * See PR kern/105943 for a proposed general solution.
329 if ((n = m_dup(m, M_DONTWAIT)) != NULL) {
330 n->m_pkthdr.csum_flags |= csum_flags;
331 if (csum_flags & CSUM_DATA_VALID)
332 n->m_pkthdr.csum_data = 0xffff;
333 (void)if_simloop(ifp, n, dst->sa_family, hlen);
336 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
337 ETHER_ADDR_LEN) == 0) {
338 m->m_pkthdr.csum_flags |= csum_flags;
339 if (csum_flags & CSUM_DATA_VALID)
340 m->m_pkthdr.csum_data = 0xffff;
341 (void) if_simloop(ifp, m, dst->sa_family, hlen);
342 return (0); /* XXX */
347 * Bridges require special output handling.
349 if (ifp->if_bridge) {
350 BRIDGE_OUTPUT(ifp, m, error);
356 (error = carp_output(ifp, m, dst, NULL)))
360 /* Handle ng_ether(4) processing, if any */
361 if (IFP2AC(ifp)->ac_netgraph != NULL) {
362 KASSERT(ng_ether_output_p != NULL,
363 ("ng_ether_output_p is NULL"));
364 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
373 /* Continue with link-layer output */
374 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
381 * in the first mbuf (if BRIDGE'ing).
384 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
387 #if defined(INET) || defined(INET6)
388 struct ip_fw *rule = ip_dn_claim_rule(m);
390 if (IPFW_LOADED && ether_ipfw != 0) {
391 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) {
394 return EACCES; /* pkt dropped */
396 return 0; /* consumed e.g. in a pipe */
402 * Queue message on interface, update output statistics if
403 * successful, and start output if interface not yet active.
405 IFQ_HANDOFF(ifp, m, error);
409 #if defined(INET) || defined(INET6)
411 * ipfw processing for ethernet packets (in and out).
412 * The second parameter is NULL from ether_demux, and ifp from
413 * ether_output_frame.
416 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
417 struct ip_fw **rule, int shared)
419 struct ether_header *eh;
420 struct ether_header save_eh;
423 struct ip_fw_args args;
425 if (*rule != NULL && fw_one_pass)
426 return 1; /* dummynet packet, already partially processed */
429 * I need some amt of data to be contiguous, and in case others need
430 * the packet (shared==1) also better be in the first mbuf.
433 i = min( m->m_pkthdr.len, max_protohdr);
434 if ( shared || m->m_len < i) {
441 eh = mtod(m, struct ether_header *);
442 save_eh = *eh; /* save copy for restore below */
443 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
445 args.m = m; /* the packet we are looking at */
446 args.oif = dst; /* destination, if any */
447 args.rule = *rule; /* matching rule to restart */
448 args.next_hop = NULL; /* we do not support forward yet */
449 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
450 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
451 i = ip_fw_chk_ptr(&args);
455 * Restore Ethernet header, as needed, in case the
456 * mbuf chain was replaced by ipfw.
458 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
463 if (eh != mtod(m, struct ether_header *))
464 bcopy(&save_eh, mtod(m, struct ether_header *),
470 if (i == IP_FW_DENY) /* drop */
473 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
475 if (i == IP_FW_PASS) /* a PASS rule. */
478 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
480 * Pass the pkt to dummynet, which consumes it.
481 * If shared, make a copy and keep the original.
484 m = m_copypacket(m, M_DONTWAIT);
489 * Pass the original to dummynet and
490 * nothing back to the caller
494 ip_dn_io_ptr(&m, dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
498 * XXX at some point add support for divert/forward actions.
499 * If none of the above matches, we have to drop the pkt.
506 * Process a received Ethernet packet; the packet is in the
507 * mbuf chain m with the ethernet header at the front.
510 ether_input(struct ifnet *ifp, struct mbuf *m)
512 struct ether_header *eh;
515 if ((ifp->if_flags & IFF_UP) == 0) {
520 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
521 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
527 * Do consistency checks to verify assumptions
528 * made by code past this point.
530 if ((m->m_flags & M_PKTHDR) == 0) {
531 if_printf(ifp, "discard frame w/o packet header\n");
536 if (m->m_len < ETHER_HDR_LEN) {
537 /* XXX maybe should pullup? */
538 if_printf(ifp, "discard frame w/o leading ethernet "
539 "header (len %u pkt len %u)\n",
540 m->m_len, m->m_pkthdr.len);
545 eh = mtod(m, struct ether_header *);
546 etype = ntohs(eh->ether_type);
547 if (m->m_pkthdr.rcvif == NULL) {
548 if_printf(ifp, "discard frame w/o interface pointer\n");
554 if (m->m_pkthdr.rcvif != ifp) {
555 if_printf(ifp, "Warning, frame marked as received on %s\n",
556 m->m_pkthdr.rcvif->if_xname);
560 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
561 if (ETHER_IS_BROADCAST(eh->ether_dhost))
562 m->m_flags |= M_BCAST;
564 m->m_flags |= M_MCAST;
570 * Tag the mbuf with an appropriate MAC label before any other
571 * consumers can get to it.
573 mac_create_mbuf_from_ifnet(ifp, m);
577 * Give bpf a chance at the packet.
579 ETHER_BPF_MTAP(ifp, m);
582 * If the CRC is still on the packet, trim it off. We do this once
583 * and once only in case we are re-entered. Nothing else on the
584 * Ethernet receive path expects to see the FCS.
586 if (m->m_flags & M_HASFCS) {
587 m_adj(m, -ETHER_CRC_LEN);
588 m->m_flags &= ~M_HASFCS;
591 ifp->if_ibytes += m->m_pkthdr.len;
593 /* Allow monitor mode to claim this frame, after stats are updated. */
594 if (ifp->if_flags & IFF_MONITOR) {
599 /* Handle input from a lagg(4) port */
600 if (ifp->if_type == IFT_IEEE8023ADLAG) {
601 KASSERT(lagg_input_p != NULL,
602 ("%s: if_lagg not loaded!", __func__));
603 m = (*lagg_input_p)(ifp, m);
605 ifp = m->m_pkthdr.rcvif;
611 * If the hardware did not process an 802.1Q tag, do this now,
612 * to allow 802.1P priority frames to be passed to the main input
614 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
616 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
617 struct ether_vlan_header *evl;
619 if (m->m_len < sizeof(*evl) &&
620 (m = m_pullup(m, sizeof(*evl))) == NULL) {
622 if_printf(ifp, "cannot pullup VLAN header\n");
629 evl = mtod(m, struct ether_vlan_header *);
630 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
631 m->m_flags |= M_VLANTAG;
633 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
634 ETHER_HDR_LEN - ETHER_TYPE_LEN);
635 m_adj(m, ETHER_VLAN_ENCAP_LEN);
638 /* Allow ng_ether(4) to claim this frame. */
639 if (IFP2AC(ifp)->ac_netgraph != NULL) {
640 KASSERT(ng_ether_input_p != NULL,
641 ("%s: ng_ether_input_p is NULL", __func__));
642 m->m_flags &= ~M_PROMISC;
643 (*ng_ether_input_p)(ifp, &m);
649 * Allow if_bridge(4) to claim this frame.
650 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
651 * and the frame should be delivered locally.
653 if (ifp->if_bridge != NULL) {
654 m->m_flags &= ~M_PROMISC;
655 BRIDGE_INPUT(ifp, m);
662 * Clear M_PROMISC on frame so that carp(4) will see it when the
663 * mbuf flows up to Layer 3.
664 * FreeBSD's implementation of carp(4) uses the inprotosw
665 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
666 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
667 * is outside the scope of the M_PROMISC test below.
668 * TODO: Maintain a hash table of ethernet addresses other than
669 * ether_dhost which may be active on this ifp.
671 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) {
672 m->m_flags &= ~M_PROMISC;
677 * If the frame received was not for our MAC address, set the
678 * M_PROMISC flag on the mbuf chain. The frame may need to
679 * be seen by the rest of the Ethernet input path in case of
680 * re-entry (e.g. bridge, vlan, netgraph) but should not be
681 * seen by upper protocol layers.
683 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
684 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
685 m->m_flags |= M_PROMISC;
688 /* First chunk of an mbuf contains good entropy */
689 if (harvest.ethernet)
690 random_harvest(m, 16, 3, 0, RANDOM_NET);
696 * Upper layer processing for a received Ethernet packet.
699 ether_demux(struct ifnet *ifp, struct mbuf *m)
701 struct ether_header *eh;
704 #if defined(NETATALK)
708 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
710 #if defined(INET) || defined(INET6)
712 * Allow dummynet and/or ipfw to claim the frame.
713 * Do not do this for PROMISC frames in case we are re-entered.
715 if (IPFW_LOADED && ether_ipfw != 0 && !(m->m_flags & M_PROMISC)) {
716 struct ip_fw *rule = ip_dn_claim_rule(m);
718 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) {
720 m_freem(m); /* dropped; free mbuf chain */
721 return; /* consumed */
725 eh = mtod(m, struct ether_header *);
726 ether_type = ntohs(eh->ether_type);
729 * If this frame has a VLAN tag other than 0, call vlan_input()
730 * if its module is loaded. Otherwise, drop.
732 if ((m->m_flags & M_VLANTAG) &&
733 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
734 if (ifp->if_vlantrunk == NULL) {
739 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
741 /* Clear before possibly re-entering ether_input(). */
742 m->m_flags &= ~M_PROMISC;
743 (*vlan_input_p)(ifp, m);
748 * Pass promiscuously received frames to the upper layer if the user
749 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
751 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
757 * Reset layer specific mbuf flags to avoid confusing upper layers.
758 * Strip off Ethernet header.
760 m->m_flags &= ~M_VLANTAG;
761 m->m_flags &= ~(M_PROTOFLAGS);
762 m_adj(m, ETHER_HDR_LEN);
765 * Dispatch frame to upper layer.
767 switch (ether_type) {
770 if ((m = ip_fastforward(m)) == NULL)
776 if (ifp->if_flags & IFF_NOARP) {
777 /* Discard packet if ARP is disabled on interface */
786 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
803 #endif /* NETATALK */
806 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
809 #if defined(NETATALK)
810 if (ether_type > ETHERMTU)
812 l = mtod(m, struct llc *);
813 if (l->llc_dsap == LLC_SNAP_LSAP &&
814 l->llc_ssap == LLC_SNAP_LSAP &&
815 l->llc_control == LLC_UI) {
816 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
817 sizeof(at_org_code)) == 0 &&
818 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
819 m_adj(m, LLC_SNAPFRAMELEN);
823 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
824 sizeof(aarp_org_code)) == 0 &&
825 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
826 m_adj(m, LLC_SNAPFRAMELEN);
831 #endif /* NETATALK */
834 netisr_dispatch(isr, m);
839 * Packet is to be discarded. If netgraph is present,
840 * hand the packet to it for last chance processing;
841 * otherwise dispose of it.
843 if (IFP2AC(ifp)->ac_netgraph != NULL) {
844 KASSERT(ng_ether_input_orphan_p != NULL,
845 ("ng_ether_input_orphan_p is NULL"));
847 * Put back the ethernet header so netgraph has a
848 * consistent view of inbound packets.
850 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
851 (*ng_ether_input_orphan_p)(ifp, m);
858 * Convert Ethernet address to printable (loggable) representation.
859 * This routine is for compatibility; it's better to just use
861 * printf("%6D", <pointer to address>, ":");
863 * since there's no static buffer involved.
866 ether_sprintf(const u_char *ap)
868 static char etherbuf[18];
869 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
874 * Perform common duties while attaching to interface list
877 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
881 struct sockaddr_dl *sdl;
883 ifp->if_addrlen = ETHER_ADDR_LEN;
884 ifp->if_hdrlen = ETHER_HDR_LEN;
886 ifp->if_mtu = ETHERMTU;
887 ifp->if_output = ether_output;
888 ifp->if_input = ether_input;
889 ifp->if_resolvemulti = ether_resolvemulti;
890 if (ifp->if_baudrate == 0)
891 ifp->if_baudrate = IF_Mbps(10); /* just a default */
892 ifp->if_broadcastaddr = etherbroadcastaddr;
895 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
896 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
897 sdl->sdl_type = IFT_ETHER;
898 sdl->sdl_alen = ifp->if_addrlen;
899 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
901 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
902 if (ng_ether_attach_p != NULL)
903 (*ng_ether_attach_p)(ifp);
905 /* Announce Ethernet MAC address if non-zero. */
906 for (i = 0; i < ifp->if_addrlen; i++)
909 if (i != ifp->if_addrlen)
910 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
914 * Perform common duties while detaching an Ethernet interface
917 ether_ifdetach(struct ifnet *ifp)
919 if (IFP2AC(ifp)->ac_netgraph != NULL) {
920 KASSERT(ng_ether_detach_p != NULL,
921 ("ng_ether_detach_p is NULL"));
922 (*ng_ether_detach_p)(ifp);
929 SYSCTL_DECL(_net_link);
930 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
931 #if defined(INET) || defined(INET6)
932 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
933 ðer_ipfw,0,"Pass ether pkts through firewall");
938 * This is for reference. We have a table-driven version
939 * of the little-endian crc32 generator, which is faster
940 * than the double-loop.
943 ether_crc32_le(const uint8_t *buf, size_t len)
950 crc = 0xffffffff; /* initial value */
952 for (i = 0; i < len; i++) {
953 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
954 carry = (crc ^ data) & 1;
957 crc = (crc ^ ETHER_CRC_POLY_LE);
965 ether_crc32_le(const uint8_t *buf, size_t len)
967 static const uint32_t crctab[] = {
968 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
969 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
970 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
971 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
976 crc = 0xffffffff; /* initial value */
978 for (i = 0; i < len; i++) {
980 crc = (crc >> 4) ^ crctab[crc & 0xf];
981 crc = (crc >> 4) ^ crctab[crc & 0xf];
989 ether_crc32_be(const uint8_t *buf, size_t len)
996 crc = 0xffffffff; /* initial value */
998 for (i = 0; i < len; i++) {
999 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1000 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1003 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1011 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1013 struct ifaddr *ifa = (struct ifaddr *) data;
1014 struct ifreq *ifr = (struct ifreq *) data;
1019 ifp->if_flags |= IFF_UP;
1021 switch (ifa->ifa_addr->sa_family) {
1024 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1025 arp_ifinit(ifp, ifa);
1030 * XXX - This code is probably wrong
1034 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1036 if (ipx_nullhost(*ina))
1041 bcopy((caddr_t) ina->x_host.c_host,
1042 (caddr_t) IF_LLADDR(ifp),
1049 ifp->if_init(ifp->if_softc);
1054 ifp->if_init(ifp->if_softc);
1061 struct sockaddr *sa;
1063 sa = (struct sockaddr *) & ifr->ifr_data;
1064 bcopy(IF_LLADDR(ifp),
1065 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1071 * Set the interface MTU.
1073 if (ifr->ifr_mtu > ETHERMTU) {
1076 ifp->if_mtu = ifr->ifr_mtu;
1080 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1087 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1088 struct sockaddr *sa)
1090 struct sockaddr_dl *sdl;
1092 struct sockaddr_in *sin;
1095 struct sockaddr_in6 *sin6;
1099 switch(sa->sa_family) {
1102 * No mapping needed. Just check that it's a valid MC address.
1104 sdl = (struct sockaddr_dl *)sa;
1105 e_addr = LLADDR(sdl);
1106 if (!ETHER_IS_MULTICAST(e_addr))
1107 return EADDRNOTAVAIL;
1113 sin = (struct sockaddr_in *)sa;
1114 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1115 return EADDRNOTAVAIL;
1116 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1120 sdl->sdl_len = sizeof *sdl;
1121 sdl->sdl_family = AF_LINK;
1122 sdl->sdl_index = ifp->if_index;
1123 sdl->sdl_type = IFT_ETHER;
1124 sdl->sdl_alen = ETHER_ADDR_LEN;
1125 e_addr = LLADDR(sdl);
1126 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1127 *llsa = (struct sockaddr *)sdl;
1132 sin6 = (struct sockaddr_in6 *)sa;
1133 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1135 * An IP6 address of 0 means listen to all
1136 * of the Ethernet multicast address used for IP6.
1137 * (This is used for multicast routers.)
1139 ifp->if_flags |= IFF_ALLMULTI;
1143 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1144 return EADDRNOTAVAIL;
1145 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1149 sdl->sdl_len = sizeof *sdl;
1150 sdl->sdl_family = AF_LINK;
1151 sdl->sdl_index = ifp->if_index;
1152 sdl->sdl_type = IFT_ETHER;
1153 sdl->sdl_alen = ETHER_ADDR_LEN;
1154 e_addr = LLADDR(sdl);
1155 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1156 *llsa = (struct sockaddr *)sdl;
1162 * Well, the text isn't quite right, but it's the name
1165 return EAFNOSUPPORT;
1170 ether_alloc(u_char type, struct ifnet *ifp)
1174 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1181 ether_free(void *com, u_char type)
1184 free(com, M_ARPCOM);
1188 ether_modevent(module_t mod, int type, void *data)
1193 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1196 if_deregister_com_alloc(IFT_ETHER);
1205 static moduledata_t ether_mod = {
1212 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1214 struct ether_vlan_header vlan;
1217 KASSERT((m->m_flags & M_VLANTAG) != 0,
1218 ("%s: vlan information not present", __func__));
1219 KASSERT(m->m_len >= sizeof(struct ether_header),
1220 ("%s: mbuf not large enough for header", __func__));
1221 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1222 vlan.evl_proto = vlan.evl_encap_proto;
1223 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1224 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1225 m->m_len -= sizeof(struct ether_header);
1226 m->m_data += sizeof(struct ether_header);
1228 * If a data link has been supplied by the caller, then we will need to
1229 * re-create a stack allocated mbuf chain with the following structure:
1231 * (1) mbuf #1 will contain the supplied data link
1232 * (2) mbuf #2 will contain the vlan header
1233 * (3) mbuf #3 will contain the original mbuf's packet data
1235 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1239 mv.m_data = (caddr_t)&vlan;
1240 mv.m_len = sizeof(vlan);
1246 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1247 m->m_len += sizeof(struct ether_header);
1248 m->m_data -= sizeof(struct ether_header);
1252 ether_vlanencap(struct mbuf *m, uint16_t tag)
1254 struct ether_vlan_header *evl;
1256 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
1259 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1261 if (m->m_len < sizeof(*evl)) {
1262 m = m_pullup(m, sizeof(*evl));
1268 * Transform the Ethernet header into an Ethernet header
1269 * with 802.1Q encapsulation.
1271 evl = mtod(m, struct ether_vlan_header *);
1272 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1273 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1274 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1275 evl->evl_tag = htons(tag);
1279 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1280 MODULE_VERSION(ether, 1);