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"
36 #include "opt_netgraph.h"
37 #include "opt_mbuf_profiling.h"
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
46 #include <sys/random.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/sysctl.h>
53 #include <net/if_var.h>
54 #include <net/if_arp.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>
61 #include <net/ethernet.h>
62 #include <net/if_bridgevar.h>
63 #include <net/if_vlan_var.h>
64 #include <net/if_llatbl.h>
68 #include <netpfil/pf/pf_mtag.h>
70 #if defined(INET) || defined(INET6)
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73 #include <netinet/if_ether.h>
74 #include <netinet/ip_carp.h>
75 #include <netinet/ip_var.h>
78 #include <netinet6/nd6.h>
81 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
82 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
83 const struct sockaddr *dst, short *tp, int *hlen);
86 #include <netatalk/at.h>
87 #include <netatalk/at_var.h>
88 #include <netatalk/at_extern.h>
90 #define llc_snap_org_code llc_un.type_snap.org_code
91 #define llc_snap_ether_type llc_un.type_snap.ether_type
93 extern u_char at_org_code[3];
94 extern u_char aarp_org_code[3];
97 #include <security/mac/mac_framework.h>
100 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
101 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
104 VNET_DEFINE(struct pfil_head, link_pfil_hook); /* Packet filter hooks */
106 /* netgraph node hooks for ng_ether(4) */
107 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
108 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
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 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
115 /* if_bridge(4) support */
116 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
117 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
118 struct sockaddr *, struct rtentry *);
119 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
121 /* if_lagg(4) support */
122 struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
124 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
125 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
127 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
130 static void ether_reassign(struct ifnet *, struct vnet *, char *);
133 /* XXX: should be in an arp support file, not here */
134 static MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
136 #define ETHER_IS_BROADCAST(addr) \
137 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
139 #define senderr(e) do { error = (e); goto bad;} while (0)
142 update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
146 if (src->m_pkthdr.csum_flags & CSUM_IP)
147 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
148 if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
149 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
150 if (src->m_pkthdr.csum_flags & CSUM_SCTP)
151 csum_flags |= CSUM_SCTP_VALID;
152 dst->m_pkthdr.csum_flags |= csum_flags;
153 if (csum_flags & CSUM_DATA_VALID)
154 dst->m_pkthdr.csum_data = 0xffff;
158 * Ethernet output routine.
159 * Encapsulate a packet of type family for the local net.
160 * Use trailer local net encapsulation if enough data in first
161 * packet leaves a multiple of 512 bytes of data in remainder.
164 ether_output(struct ifnet *ifp, struct mbuf *m,
165 const struct sockaddr *dst, struct route *ro)
168 int error = 0, hdrcmplt = 0;
169 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
170 struct llentry *lle = NULL;
171 struct rtentry *rt0 = NULL;
172 struct ether_header *eh;
175 int hlen; /* link layer header length */
178 if (!(m->m_flags & (M_BCAST | M_MCAST)))
183 error = mac_ifnet_check_transmit(ifp, m);
189 if (ifp->if_flags & IFF_MONITOR)
191 if (!((ifp->if_flags & IFF_UP) &&
192 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
195 hlen = ETHER_HDR_LEN;
196 switch (dst->sa_family) {
199 if (lle != NULL && (lle->la_flags & LLE_VALID))
200 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
202 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
204 return (error == EWOULDBLOCK ? 0 : error);
205 type = htons(ETHERTYPE_IP);
210 ah = mtod(m, struct arphdr *);
211 ah->ar_hrd = htons(ARPHRD_ETHER);
213 loop_copy = 0; /* if this is for us, don't do it */
215 switch(ntohs(ah->ar_op)) {
216 case ARPOP_REVREQUEST:
218 type = htons(ETHERTYPE_REVARP);
223 type = htons(ETHERTYPE_ARP);
227 if (m->m_flags & M_BCAST)
228 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
230 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
237 if (lle != NULL && (lle->la_flags & LLE_VALID))
238 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
240 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
243 type = htons(ETHERTYPE_IPV6);
249 struct at_ifaddr *aa;
251 if ((aa = at_ifawithnet((const struct sockaddr_at *)dst)) == NULL)
252 senderr(EHOSTUNREACH); /* XXX */
253 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
254 ifa_free(&aa->aa_ifa);
258 * In the phase 2 case, need to prepend an mbuf for the llc header.
260 if ( aa->aa_flags & AFA_PHASE2 ) {
263 ifa_free(&aa->aa_ifa);
264 M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
267 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
268 llc.llc_control = LLC_UI;
269 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
270 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
271 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
272 type = htons(m->m_pkthdr.len);
273 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
275 ifa_free(&aa->aa_ifa);
276 type = htons(ETHERTYPE_AT);
280 #endif /* NETATALK */
282 case pseudo_AF_HDRCMPLT:
284 const struct ether_header *eh;
287 eh = (const struct ether_header *)dst->sa_data;
288 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
292 loop_copy = 0; /* if this is for us, don't do it */
293 eh = (const struct ether_header *)dst->sa_data;
294 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
295 type = eh->ether_type;
299 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
300 senderr(EAFNOSUPPORT);
303 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
304 update_mbuf_csumflags(m, m);
305 return (if_simloop(ifp, m, dst->sa_family, 0));
309 * Add local net header. If no space in first mbuf,
312 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
315 eh = mtod(m, struct ether_header *);
316 (void)memcpy(&eh->ether_type, &type,
317 sizeof(eh->ether_type));
318 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
320 (void)memcpy(eh->ether_shost, esrc,
321 sizeof(eh->ether_shost));
323 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
324 sizeof(eh->ether_shost));
327 * If a simplex interface, and the packet is being sent to our
328 * Ethernet address or a broadcast address, loopback a copy.
329 * XXX To make a simplex device behave exactly like a duplex
330 * device, we should copy in the case of sending to our own
331 * ethernet address (thus letting the original actually appear
332 * on the wire). However, we don't do that here for security
333 * reasons and compatibility with the original behavior.
335 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
336 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
337 if (m->m_flags & M_BCAST) {
341 * Because if_simloop() modifies the packet, we need a
342 * writable copy through m_dup() instead of a readonly
343 * one as m_copy[m] would give us. The alternative would
344 * be to modify if_simloop() to handle the readonly mbuf,
345 * but performancewise it is mostly equivalent (trading
346 * extra data copying vs. extra locking).
348 * XXX This is a local workaround. A number of less
349 * often used kernel parts suffer from the same bug.
350 * See PR kern/105943 for a proposed general solution.
352 if ((n = m_dup(m, M_NOWAIT)) != NULL) {
353 update_mbuf_csumflags(m, n);
354 (void)if_simloop(ifp, n, dst->sa_family, hlen);
357 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
358 ETHER_ADDR_LEN) == 0) {
359 update_mbuf_csumflags(m, m);
360 (void) if_simloop(ifp, m, dst->sa_family, hlen);
361 return (0); /* XXX */
366 * Bridges require special output handling.
368 if (ifp->if_bridge) {
369 BRIDGE_OUTPUT(ifp, m, error);
373 #if defined(INET) || defined(INET6)
375 (error = (*carp_output_p)(ifp, m, dst)))
379 /* Handle ng_ether(4) processing, if any */
380 if (IFP2AC(ifp)->ac_netgraph != NULL) {
381 KASSERT(ng_ether_output_p != NULL,
382 ("ng_ether_output_p is NULL"));
383 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
392 /* Continue with link-layer output */
393 return ether_output_frame(ifp, m);
397 * Ethernet link layer output routine to send a raw frame to the device.
399 * This assumes that the 14 byte Ethernet header is present and contiguous
400 * in the first mbuf (if BRIDGE'ing).
403 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
407 if (PFIL_HOOKED(&V_link_pfil_hook)) {
408 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_OUT, NULL);
418 * Queue message on interface, update output statistics if
419 * successful, and start output if interface not yet active.
421 return ((ifp->if_transmit)(ifp, m));
424 #if defined(INET) || defined(INET6)
428 * Process a received Ethernet packet; the packet is in the
429 * mbuf chain m with the ethernet header at the front.
432 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
434 struct ether_header *eh;
437 if ((ifp->if_flags & IFF_UP) == 0) {
442 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
443 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
449 * Do consistency checks to verify assumptions
450 * made by code past this point.
452 if ((m->m_flags & M_PKTHDR) == 0) {
453 if_printf(ifp, "discard frame w/o packet header\n");
458 if (m->m_len < ETHER_HDR_LEN) {
459 /* XXX maybe should pullup? */
460 if_printf(ifp, "discard frame w/o leading ethernet "
461 "header (len %u pkt len %u)\n",
462 m->m_len, m->m_pkthdr.len);
467 eh = mtod(m, struct ether_header *);
468 etype = ntohs(eh->ether_type);
469 if (m->m_pkthdr.rcvif == NULL) {
470 if_printf(ifp, "discard frame w/o interface pointer\n");
476 if (m->m_pkthdr.rcvif != ifp) {
477 if_printf(ifp, "Warning, frame marked as received on %s\n",
478 m->m_pkthdr.rcvif->if_xname);
482 CURVNET_SET_QUIET(ifp->if_vnet);
484 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
485 if (ETHER_IS_BROADCAST(eh->ether_dhost))
486 m->m_flags |= M_BCAST;
488 m->m_flags |= M_MCAST;
494 * Tag the mbuf with an appropriate MAC label before any other
495 * consumers can get to it.
497 mac_ifnet_create_mbuf(ifp, m);
501 * Give bpf a chance at the packet.
503 ETHER_BPF_MTAP(ifp, m);
506 * If the CRC is still on the packet, trim it off. We do this once
507 * and once only in case we are re-entered. Nothing else on the
508 * Ethernet receive path expects to see the FCS.
510 if (m->m_flags & M_HASFCS) {
511 m_adj(m, -ETHER_CRC_LEN);
512 m->m_flags &= ~M_HASFCS;
515 if (!(ifp->if_capenable & IFCAP_HWSTATS))
516 ifp->if_ibytes += m->m_pkthdr.len;
518 /* Allow monitor mode to claim this frame, after stats are updated. */
519 if (ifp->if_flags & IFF_MONITOR) {
525 /* Handle input from a lagg(4) port */
526 if (ifp->if_type == IFT_IEEE8023ADLAG) {
527 KASSERT(lagg_input_p != NULL,
528 ("%s: if_lagg not loaded!", __func__));
529 m = (*lagg_input_p)(ifp, m);
531 ifp = m->m_pkthdr.rcvif;
539 * If the hardware did not process an 802.1Q tag, do this now,
540 * to allow 802.1P priority frames to be passed to the main input
542 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
544 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
545 struct ether_vlan_header *evl;
547 if (m->m_len < sizeof(*evl) &&
548 (m = m_pullup(m, sizeof(*evl))) == NULL) {
550 if_printf(ifp, "cannot pullup VLAN header\n");
558 evl = mtod(m, struct ether_vlan_header *);
559 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
560 m->m_flags |= M_VLANTAG;
562 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
563 ETHER_HDR_LEN - ETHER_TYPE_LEN);
564 m_adj(m, ETHER_VLAN_ENCAP_LEN);
565 eh = mtod(m, struct ether_header *);
568 M_SETFIB(m, ifp->if_fib);
570 /* Allow ng_ether(4) to claim this frame. */
571 if (IFP2AC(ifp)->ac_netgraph != NULL) {
572 KASSERT(ng_ether_input_p != NULL,
573 ("%s: ng_ether_input_p is NULL", __func__));
574 m->m_flags &= ~M_PROMISC;
575 (*ng_ether_input_p)(ifp, &m);
580 eh = mtod(m, struct ether_header *);
584 * Allow if_bridge(4) to claim this frame.
585 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
586 * and the frame should be delivered locally.
588 if (ifp->if_bridge != NULL) {
589 m->m_flags &= ~M_PROMISC;
590 BRIDGE_INPUT(ifp, m);
595 eh = mtod(m, struct ether_header *);
598 #if defined(INET) || defined(INET6)
600 * Clear M_PROMISC on frame so that carp(4) will see it when the
601 * mbuf flows up to Layer 3.
602 * FreeBSD's implementation of carp(4) uses the inprotosw
603 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
604 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
605 * is outside the scope of the M_PROMISC test below.
606 * TODO: Maintain a hash table of ethernet addresses other than
607 * ether_dhost which may be active on this ifp.
609 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
610 m->m_flags &= ~M_PROMISC;
615 * If the frame received was not for our MAC address, set the
616 * M_PROMISC flag on the mbuf chain. The frame may need to
617 * be seen by the rest of the Ethernet input path in case of
618 * re-entry (e.g. bridge, vlan, netgraph) but should not be
619 * seen by upper protocol layers.
621 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
622 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
623 m->m_flags |= M_PROMISC;
626 if (harvest.ethernet)
627 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_ETHER);
634 * Ethernet input dispatch; by default, direct dispatch here regardless of
635 * global configuration.
638 ether_nh_input(struct mbuf *m)
641 ether_input_internal(m->m_pkthdr.rcvif, m);
644 static struct netisr_handler ether_nh = {
646 .nh_handler = ether_nh_input,
647 .nh_proto = NETISR_ETHER,
648 .nh_policy = NETISR_POLICY_SOURCE,
649 .nh_dispatch = NETISR_DISPATCH_DIRECT,
653 ether_init(__unused void *arg)
656 netisr_register(ðer_nh);
658 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
661 vnet_ether_init(__unused void *arg)
665 /* Initialize packet filter hooks. */
666 V_link_pfil_hook.ph_type = PFIL_TYPE_AF;
667 V_link_pfil_hook.ph_af = AF_LINK;
668 if ((i = pfil_head_register(&V_link_pfil_hook)) != 0)
669 printf("%s: WARNING: unable to register pfil link hook, "
670 "error %d\n", __func__, i);
672 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
673 vnet_ether_init, NULL);
676 vnet_ether_destroy(__unused void *arg)
680 if ((i = pfil_head_unregister(&V_link_pfil_hook)) != 0)
681 printf("%s: WARNING: unable to unregister pfil link hook, "
682 "error %d\n", __func__, i);
684 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
685 vnet_ether_destroy, NULL);
690 ether_input(struct ifnet *ifp, struct mbuf *m)
696 * The drivers are allowed to pass in a chain of packets linked with
697 * m_nextpkt. We split them up into separate packets here and pass
698 * them up. This allows the drivers to amortize the receive lock.
705 * We will rely on rcvif being set properly in the deferred context,
706 * so assert it is correct here.
708 KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
709 netisr_dispatch(NETISR_ETHER, m);
715 * Upper layer processing for a received Ethernet packet.
718 ether_demux(struct ifnet *ifp, struct mbuf *m)
720 struct ether_header *eh;
723 #if defined(NETATALK)
727 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
729 /* Do not grab PROMISC frames in case we are re-entered. */
730 if (PFIL_HOOKED(&V_link_pfil_hook) && !(m->m_flags & M_PROMISC)) {
731 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_IN, NULL);
733 if (i != 0 || m == NULL)
737 eh = mtod(m, struct ether_header *);
738 ether_type = ntohs(eh->ether_type);
741 * If this frame has a VLAN tag other than 0, call vlan_input()
742 * if its module is loaded. Otherwise, drop.
744 if ((m->m_flags & M_VLANTAG) &&
745 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
746 if (ifp->if_vlantrunk == NULL) {
751 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
753 /* Clear before possibly re-entering ether_input(). */
754 m->m_flags &= ~M_PROMISC;
755 (*vlan_input_p)(ifp, m);
760 * Pass promiscuously received frames to the upper layer if the user
761 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
763 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
769 * Reset layer specific mbuf flags to avoid confusing upper layers.
770 * Strip off Ethernet header.
772 m->m_flags &= ~M_VLANTAG;
774 m_adj(m, ETHER_HDR_LEN);
777 * Dispatch frame to upper layer.
779 switch (ether_type) {
782 if ((m = ip_fastforward(m)) == NULL)
788 if (ifp->if_flags & IFF_NOARP) {
789 /* Discard packet if ARP is disabled on interface */
808 #endif /* NETATALK */
810 #if defined(NETATALK)
811 if (ether_type > ETHERMTU)
813 l = mtod(m, struct llc *);
814 if (l->llc_dsap == LLC_SNAP_LSAP &&
815 l->llc_ssap == LLC_SNAP_LSAP &&
816 l->llc_control == LLC_UI) {
817 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
818 sizeof(at_org_code)) == 0 &&
819 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
820 m_adj(m, LLC_SNAPFRAMELEN);
824 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
825 sizeof(aarp_org_code)) == 0 &&
826 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
827 m_adj(m, LLC_SNAPFRAMELEN);
832 #endif /* NETATALK */
835 netisr_dispatch(isr, m);
840 * Packet is to be discarded. If netgraph is present,
841 * hand the packet to it for last chance processing;
842 * otherwise dispose of it.
844 if (IFP2AC(ifp)->ac_netgraph != NULL) {
845 KASSERT(ng_ether_input_orphan_p != NULL,
846 ("ng_ether_input_orphan_p is NULL"));
848 * Put back the ethernet header so netgraph has a
849 * consistent view of inbound packets.
851 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
852 (*ng_ether_input_orphan_p)(ifp, m);
859 * Convert Ethernet address to printable (loggable) representation.
860 * This routine is for compatibility; it's better to just use
862 * printf("%6D", <pointer to address>, ":");
864 * since there's no static buffer involved.
867 ether_sprintf(const u_char *ap)
869 static char etherbuf[18];
870 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
875 * Perform common duties while attaching to interface list
878 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
882 struct sockaddr_dl *sdl;
884 ifp->if_addrlen = ETHER_ADDR_LEN;
885 ifp->if_hdrlen = ETHER_HDR_LEN;
887 ifp->if_mtu = ETHERMTU;
888 ifp->if_output = ether_output;
889 ifp->if_input = ether_input;
890 ifp->if_resolvemulti = ether_resolvemulti;
892 ifp->if_reassign = ether_reassign;
894 if (ifp->if_baudrate == 0)
895 ifp->if_baudrate = IF_Mbps(10); /* just a default */
896 ifp->if_broadcastaddr = etherbroadcastaddr;
899 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
900 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
901 sdl->sdl_type = IFT_ETHER;
902 sdl->sdl_alen = ifp->if_addrlen;
903 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
905 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
906 if (ng_ether_attach_p != NULL)
907 (*ng_ether_attach_p)(ifp);
909 /* Announce Ethernet MAC address if non-zero. */
910 for (i = 0; i < ifp->if_addrlen; i++)
913 if (i != ifp->if_addrlen)
914 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
916 uuid_ether_add(LLADDR(sdl));
920 * Perform common duties while detaching an Ethernet interface
923 ether_ifdetach(struct ifnet *ifp)
925 struct sockaddr_dl *sdl;
927 sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
928 uuid_ether_del(LLADDR(sdl));
930 if (IFP2AC(ifp)->ac_netgraph != NULL) {
931 KASSERT(ng_ether_detach_p != NULL,
932 ("ng_ether_detach_p is NULL"));
933 (*ng_ether_detach_p)(ifp);
942 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
945 if (IFP2AC(ifp)->ac_netgraph != NULL) {
946 KASSERT(ng_ether_detach_p != NULL,
947 ("ng_ether_detach_p is NULL"));
948 (*ng_ether_detach_p)(ifp);
951 if (ng_ether_attach_p != NULL) {
952 CURVNET_SET_QUIET(new_vnet);
953 (*ng_ether_attach_p)(ifp);
959 SYSCTL_DECL(_net_link);
960 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
964 * This is for reference. We have a table-driven version
965 * of the little-endian crc32 generator, which is faster
966 * than the double-loop.
969 ether_crc32_le(const uint8_t *buf, size_t len)
976 crc = 0xffffffff; /* initial value */
978 for (i = 0; i < len; i++) {
979 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
980 carry = (crc ^ data) & 1;
983 crc = (crc ^ ETHER_CRC_POLY_LE);
991 ether_crc32_le(const uint8_t *buf, size_t len)
993 static const uint32_t crctab[] = {
994 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
995 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
996 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
997 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1002 crc = 0xffffffff; /* initial value */
1004 for (i = 0; i < len; i++) {
1006 crc = (crc >> 4) ^ crctab[crc & 0xf];
1007 crc = (crc >> 4) ^ crctab[crc & 0xf];
1015 ether_crc32_be(const uint8_t *buf, size_t len)
1018 uint32_t crc, carry;
1022 crc = 0xffffffff; /* initial value */
1024 for (i = 0; i < len; i++) {
1025 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1026 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1029 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1037 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1039 struct ifaddr *ifa = (struct ifaddr *) data;
1040 struct ifreq *ifr = (struct ifreq *) data;
1045 ifp->if_flags |= IFF_UP;
1047 switch (ifa->ifa_addr->sa_family) {
1050 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1051 arp_ifinit(ifp, ifa);
1055 ifp->if_init(ifp->if_softc);
1062 struct sockaddr *sa;
1064 sa = (struct sockaddr *) & ifr->ifr_data;
1065 bcopy(IF_LLADDR(ifp),
1066 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1072 * Set the interface MTU.
1074 if (ifr->ifr_mtu > ETHERMTU) {
1077 ifp->if_mtu = ifr->ifr_mtu;
1081 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1088 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1089 struct sockaddr *sa)
1091 struct sockaddr_dl *sdl;
1093 struct sockaddr_in *sin;
1096 struct sockaddr_in6 *sin6;
1100 switch(sa->sa_family) {
1103 * No mapping needed. Just check that it's a valid MC address.
1105 sdl = (struct sockaddr_dl *)sa;
1106 e_addr = LLADDR(sdl);
1107 if (!ETHER_IS_MULTICAST(e_addr))
1108 return EADDRNOTAVAIL;
1114 sin = (struct sockaddr_in *)sa;
1115 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1116 return EADDRNOTAVAIL;
1117 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1118 sdl->sdl_alen = ETHER_ADDR_LEN;
1119 e_addr = LLADDR(sdl);
1120 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1121 *llsa = (struct sockaddr *)sdl;
1126 sin6 = (struct sockaddr_in6 *)sa;
1127 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1129 * An IP6 address of 0 means listen to all
1130 * of the Ethernet multicast address used for IP6.
1131 * (This is used for multicast routers.)
1133 ifp->if_flags |= IFF_ALLMULTI;
1137 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1138 return EADDRNOTAVAIL;
1139 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1140 sdl->sdl_alen = ETHER_ADDR_LEN;
1141 e_addr = LLADDR(sdl);
1142 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1143 *llsa = (struct sockaddr *)sdl;
1149 * Well, the text isn't quite right, but it's the name
1152 return EAFNOSUPPORT;
1157 ether_alloc(u_char type, struct ifnet *ifp)
1161 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1168 ether_free(void *com, u_char type)
1171 free(com, M_ARPCOM);
1175 ether_modevent(module_t mod, int type, void *data)
1180 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1183 if_deregister_com_alloc(IFT_ETHER);
1192 static moduledata_t ether_mod = {
1199 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1201 struct ether_vlan_header vlan;
1204 KASSERT((m->m_flags & M_VLANTAG) != 0,
1205 ("%s: vlan information not present", __func__));
1206 KASSERT(m->m_len >= sizeof(struct ether_header),
1207 ("%s: mbuf not large enough for header", __func__));
1208 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1209 vlan.evl_proto = vlan.evl_encap_proto;
1210 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1211 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1212 m->m_len -= sizeof(struct ether_header);
1213 m->m_data += sizeof(struct ether_header);
1215 * If a data link has been supplied by the caller, then we will need to
1216 * re-create a stack allocated mbuf chain with the following structure:
1218 * (1) mbuf #1 will contain the supplied data link
1219 * (2) mbuf #2 will contain the vlan header
1220 * (3) mbuf #3 will contain the original mbuf's packet data
1222 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1226 mv.m_data = (caddr_t)&vlan;
1227 mv.m_len = sizeof(vlan);
1233 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1234 m->m_len += sizeof(struct ether_header);
1235 m->m_data -= sizeof(struct ether_header);
1239 ether_vlanencap(struct mbuf *m, uint16_t tag)
1241 struct ether_vlan_header *evl;
1243 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1246 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1248 if (m->m_len < sizeof(*evl)) {
1249 m = m_pullup(m, sizeof(*evl));
1255 * Transform the Ethernet header into an Ethernet header
1256 * with 802.1Q encapsulation.
1258 evl = mtod(m, struct ether_vlan_header *);
1259 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1260 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1261 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1262 evl->evl_tag = htons(tag);
1266 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1267 MODULE_VERSION(ether, 1);