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"
37 #include "opt_netgraph.h"
38 #include "opt_mbuf_profiling.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #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>
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>
65 #include <net/pf_mtag.h>
69 #if defined(INET) || defined(INET6)
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/if_ether.h>
73 #include <netinet/ip_carp.h>
74 #include <netinet/ip_var.h>
77 #include <netinet6/nd6.h>
81 #include <netipx/ipx.h>
82 #include <netipx/ipx_if.h>
85 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
86 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
87 const struct sockaddr *dst, short *tp, int *hlen);
90 #include <netatalk/at.h>
91 #include <netatalk/at_var.h>
92 #include <netatalk/at_extern.h>
94 #define llc_snap_org_code llc_un.type_snap.org_code
95 #define llc_snap_ether_type llc_un.type_snap.ether_type
97 extern u_char at_org_code[3];
98 extern u_char aarp_org_code[3];
101 #include <security/mac/mac_framework.h>
104 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
105 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
108 VNET_DEFINE(struct pfil_head, link_pfil_hook); /* Packet filter hooks */
110 /* netgraph node hooks for ng_ether(4) */
111 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
112 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
113 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
114 void (*ng_ether_attach_p)(struct ifnet *ifp);
115 void (*ng_ether_detach_p)(struct ifnet *ifp);
117 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
119 /* if_bridge(4) support */
120 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
121 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
122 struct sockaddr *, struct rtentry *);
123 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
125 /* if_lagg(4) support */
126 struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
128 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
129 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
131 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
134 static void ether_reassign(struct ifnet *, struct vnet *, char *);
137 /* XXX: should be in an arp support file, not here */
138 static MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
140 #define ETHER_IS_BROADCAST(addr) \
141 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
143 #define senderr(e) do { error = (e); goto bad;} while (0)
146 update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
150 if (src->m_pkthdr.csum_flags & CSUM_IP)
151 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
152 if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
153 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
154 if (src->m_pkthdr.csum_flags & CSUM_SCTP)
155 csum_flags |= CSUM_SCTP_VALID;
156 dst->m_pkthdr.csum_flags |= csum_flags;
157 if (csum_flags & CSUM_DATA_VALID)
158 dst->m_pkthdr.csum_data = 0xffff;
162 * Ethernet output routine.
163 * Encapsulate a packet of type family for the local net.
164 * Use trailer local net encapsulation if enough data in first
165 * packet leaves a multiple of 512 bytes of data in remainder.
168 ether_output(struct ifnet *ifp, struct mbuf *m,
169 const struct sockaddr *dst, struct route *ro)
172 int error = 0, hdrcmplt = 0;
173 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
174 struct llentry *lle = NULL;
175 struct rtentry *rt0 = NULL;
176 struct ether_header *eh;
179 int hlen; /* link layer header length */
182 if (!(m->m_flags & (M_BCAST | M_MCAST)))
187 error = mac_ifnet_check_transmit(ifp, m);
193 if (ifp->if_flags & IFF_MONITOR)
195 if (!((ifp->if_flags & IFF_UP) &&
196 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
199 hlen = ETHER_HDR_LEN;
200 switch (dst->sa_family) {
203 if (lle != NULL && (lle->la_flags & LLE_VALID))
204 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
206 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
208 return (error == EWOULDBLOCK ? 0 : error);
209 type = htons(ETHERTYPE_IP);
214 ah = mtod(m, struct arphdr *);
215 ah->ar_hrd = htons(ARPHRD_ETHER);
217 loop_copy = 0; /* if this is for us, don't do it */
219 switch(ntohs(ah->ar_op)) {
220 case ARPOP_REVREQUEST:
222 type = htons(ETHERTYPE_REVARP);
227 type = htons(ETHERTYPE_ARP);
231 if (m->m_flags & M_BCAST)
232 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
234 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
241 if (lle != NULL && (lle->la_flags & LLE_VALID))
242 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
244 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
247 type = htons(ETHERTYPE_IPV6);
253 error = ef_outputp(ifp, &m, dst, &type, &hlen);
257 type = htons(ETHERTYPE_IPX);
258 bcopy(&((const struct sockaddr_ipx *)dst)->sipx_addr.x_host,
259 edst, sizeof (edst));
265 struct at_ifaddr *aa;
267 if ((aa = at_ifawithnet((const struct sockaddr_at *)dst)) == NULL)
268 senderr(EHOSTUNREACH); /* XXX */
269 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
270 ifa_free(&aa->aa_ifa);
274 * In the phase 2 case, need to prepend an mbuf for the llc header.
276 if ( aa->aa_flags & AFA_PHASE2 ) {
279 ifa_free(&aa->aa_ifa);
280 M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
283 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
284 llc.llc_control = LLC_UI;
285 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
286 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
287 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
288 type = htons(m->m_pkthdr.len);
289 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
291 ifa_free(&aa->aa_ifa);
292 type = htons(ETHERTYPE_AT);
296 #endif /* NETATALK */
298 case pseudo_AF_HDRCMPLT:
300 const struct ether_header *eh;
303 eh = (const struct ether_header *)dst->sa_data;
304 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
308 loop_copy = 0; /* if this is for us, don't do it */
309 eh = (const struct ether_header *)dst->sa_data;
310 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
311 type = eh->ether_type;
315 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
316 senderr(EAFNOSUPPORT);
319 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
320 update_mbuf_csumflags(m, m);
321 return (if_simloop(ifp, m, dst->sa_family, 0));
325 * Add local net header. If no space in first mbuf,
328 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
331 eh = mtod(m, struct ether_header *);
332 (void)memcpy(&eh->ether_type, &type,
333 sizeof(eh->ether_type));
334 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
336 (void)memcpy(eh->ether_shost, esrc,
337 sizeof(eh->ether_shost));
339 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
340 sizeof(eh->ether_shost));
343 * If a simplex interface, and the packet is being sent to our
344 * Ethernet address or a broadcast address, loopback a copy.
345 * XXX To make a simplex device behave exactly like a duplex
346 * device, we should copy in the case of sending to our own
347 * ethernet address (thus letting the original actually appear
348 * on the wire). However, we don't do that here for security
349 * reasons and compatibility with the original behavior.
351 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
352 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
353 if (m->m_flags & M_BCAST) {
357 * Because if_simloop() modifies the packet, we need a
358 * writable copy through m_dup() instead of a readonly
359 * one as m_copy[m] would give us. The alternative would
360 * be to modify if_simloop() to handle the readonly mbuf,
361 * but performancewise it is mostly equivalent (trading
362 * extra data copying vs. extra locking).
364 * XXX This is a local workaround. A number of less
365 * often used kernel parts suffer from the same bug.
366 * See PR kern/105943 for a proposed general solution.
368 if ((n = m_dup(m, M_NOWAIT)) != NULL) {
369 update_mbuf_csumflags(m, n);
370 (void)if_simloop(ifp, n, dst->sa_family, hlen);
373 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
374 ETHER_ADDR_LEN) == 0) {
375 update_mbuf_csumflags(m, m);
376 (void) if_simloop(ifp, m, dst->sa_family, hlen);
377 return (0); /* XXX */
382 * Bridges require special output handling.
384 if (ifp->if_bridge) {
385 BRIDGE_OUTPUT(ifp, m, error);
389 #if defined(INET) || defined(INET6)
391 (error = (*carp_output_p)(ifp, m, dst)))
395 /* Handle ng_ether(4) processing, if any */
396 if (IFP2AC(ifp)->ac_netgraph != NULL) {
397 KASSERT(ng_ether_output_p != NULL,
398 ("ng_ether_output_p is NULL"));
399 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
408 /* Continue with link-layer output */
409 return ether_output_frame(ifp, m);
413 * Ethernet link layer output routine to send a raw frame to the device.
415 * This assumes that the 14 byte Ethernet header is present and contiguous
416 * in the first mbuf (if BRIDGE'ing).
419 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
423 if (PFIL_HOOKED(&V_link_pfil_hook)) {
424 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_OUT, NULL);
434 * Queue message on interface, update output statistics if
435 * successful, and start output if interface not yet active.
437 return ((ifp->if_transmit)(ifp, m));
440 #if defined(INET) || defined(INET6)
444 * Process a received Ethernet packet; the packet is in the
445 * mbuf chain m with the ethernet header at the front.
448 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
450 struct ether_header *eh;
453 if ((ifp->if_flags & IFF_UP) == 0) {
458 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
459 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
465 * Do consistency checks to verify assumptions
466 * made by code past this point.
468 if ((m->m_flags & M_PKTHDR) == 0) {
469 if_printf(ifp, "discard frame w/o packet header\n");
474 if (m->m_len < ETHER_HDR_LEN) {
475 /* XXX maybe should pullup? */
476 if_printf(ifp, "discard frame w/o leading ethernet "
477 "header (len %u pkt len %u)\n",
478 m->m_len, m->m_pkthdr.len);
483 eh = mtod(m, struct ether_header *);
484 etype = ntohs(eh->ether_type);
485 if (m->m_pkthdr.rcvif == NULL) {
486 if_printf(ifp, "discard frame w/o interface pointer\n");
492 if (m->m_pkthdr.rcvif != ifp) {
493 if_printf(ifp, "Warning, frame marked as received on %s\n",
494 m->m_pkthdr.rcvif->if_xname);
498 CURVNET_SET_QUIET(ifp->if_vnet);
500 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
501 if (ETHER_IS_BROADCAST(eh->ether_dhost))
502 m->m_flags |= M_BCAST;
504 m->m_flags |= M_MCAST;
510 * Tag the mbuf with an appropriate MAC label before any other
511 * consumers can get to it.
513 mac_ifnet_create_mbuf(ifp, m);
517 * Give bpf a chance at the packet.
519 ETHER_BPF_MTAP(ifp, m);
522 * If the CRC is still on the packet, trim it off. We do this once
523 * and once only in case we are re-entered. Nothing else on the
524 * Ethernet receive path expects to see the FCS.
526 if (m->m_flags & M_HASFCS) {
527 m_adj(m, -ETHER_CRC_LEN);
528 m->m_flags &= ~M_HASFCS;
531 ifp->if_ibytes += m->m_pkthdr.len;
533 /* Allow monitor mode to claim this frame, after stats are updated. */
534 if (ifp->if_flags & IFF_MONITOR) {
540 /* Handle input from a lagg(4) port */
541 if (ifp->if_type == IFT_IEEE8023ADLAG) {
542 KASSERT(lagg_input_p != NULL,
543 ("%s: if_lagg not loaded!", __func__));
544 m = (*lagg_input_p)(ifp, m);
546 ifp = m->m_pkthdr.rcvif;
554 * If the hardware did not process an 802.1Q tag, do this now,
555 * to allow 802.1P priority frames to be passed to the main input
557 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
559 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
560 struct ether_vlan_header *evl;
562 if (m->m_len < sizeof(*evl) &&
563 (m = m_pullup(m, sizeof(*evl))) == NULL) {
565 if_printf(ifp, "cannot pullup VLAN header\n");
573 evl = mtod(m, struct ether_vlan_header *);
574 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
575 m->m_flags |= M_VLANTAG;
577 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
578 ETHER_HDR_LEN - ETHER_TYPE_LEN);
579 m_adj(m, ETHER_VLAN_ENCAP_LEN);
580 eh = mtod(m, struct ether_header *);
583 M_SETFIB(m, ifp->if_fib);
585 /* Allow ng_ether(4) to claim this frame. */
586 if (IFP2AC(ifp)->ac_netgraph != NULL) {
587 KASSERT(ng_ether_input_p != NULL,
588 ("%s: ng_ether_input_p is NULL", __func__));
589 m->m_flags &= ~M_PROMISC;
590 (*ng_ether_input_p)(ifp, &m);
595 eh = mtod(m, struct ether_header *);
599 * Allow if_bridge(4) to claim this frame.
600 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
601 * and the frame should be delivered locally.
603 if (ifp->if_bridge != NULL) {
604 m->m_flags &= ~M_PROMISC;
605 BRIDGE_INPUT(ifp, m);
610 eh = mtod(m, struct ether_header *);
613 #if defined(INET) || defined(INET6)
615 * Clear M_PROMISC on frame so that carp(4) will see it when the
616 * mbuf flows up to Layer 3.
617 * FreeBSD's implementation of carp(4) uses the inprotosw
618 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
619 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
620 * is outside the scope of the M_PROMISC test below.
621 * TODO: Maintain a hash table of ethernet addresses other than
622 * ether_dhost which may be active on this ifp.
624 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
625 m->m_flags &= ~M_PROMISC;
630 * If the frame received was not for our MAC address, set the
631 * M_PROMISC flag on the mbuf chain. The frame may need to
632 * be seen by the rest of the Ethernet input path in case of
633 * re-entry (e.g. bridge, vlan, netgraph) but should not be
634 * seen by upper protocol layers.
636 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
637 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
638 m->m_flags |= M_PROMISC;
641 if (harvest.ethernet)
642 random_harvest(&(m->m_data), 12, 3, 0, RANDOM_NET_ETHER);
649 * Ethernet input dispatch; by default, direct dispatch here regardless of
650 * global configuration.
653 ether_nh_input(struct mbuf *m)
656 ether_input_internal(m->m_pkthdr.rcvif, m);
659 static struct netisr_handler ether_nh = {
661 .nh_handler = ether_nh_input,
662 .nh_proto = NETISR_ETHER,
663 .nh_policy = NETISR_POLICY_SOURCE,
664 .nh_dispatch = NETISR_DISPATCH_DIRECT,
668 ether_init(__unused void *arg)
671 netisr_register(ðer_nh);
673 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
676 vnet_ether_init(__unused void *arg)
680 /* Initialize packet filter hooks. */
681 V_link_pfil_hook.ph_type = PFIL_TYPE_AF;
682 V_link_pfil_hook.ph_af = AF_LINK;
683 if ((i = pfil_head_register(&V_link_pfil_hook)) != 0)
684 printf("%s: WARNING: unable to register pfil link hook, "
685 "error %d\n", __func__, i);
687 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
688 vnet_ether_init, NULL);
691 vnet_ether_destroy(__unused void *arg)
695 if ((i = pfil_head_unregister(&V_link_pfil_hook)) != 0)
696 printf("%s: WARNING: unable to unregister pfil link hook, "
697 "error %d\n", __func__, i);
699 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
700 vnet_ether_destroy, NULL);
705 ether_input(struct ifnet *ifp, struct mbuf *m)
709 * We will rely on rcvif being set properly in the deferred context,
710 * so assert it is correct here.
712 KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
714 netisr_dispatch(NETISR_ETHER, m);
718 * Upper layer processing for a received Ethernet packet.
721 ether_demux(struct ifnet *ifp, struct mbuf *m)
723 struct ether_header *eh;
726 #if defined(NETATALK)
730 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
732 /* Do not grab PROMISC frames in case we are re-entered. */
733 if (PFIL_HOOKED(&V_link_pfil_hook) && !(m->m_flags & M_PROMISC)) {
734 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_IN, NULL);
736 if (i != 0 || m == NULL)
740 eh = mtod(m, struct ether_header *);
741 ether_type = ntohs(eh->ether_type);
744 * If this frame has a VLAN tag other than 0, call vlan_input()
745 * if its module is loaded. Otherwise, drop.
747 if ((m->m_flags & M_VLANTAG) &&
748 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
749 if (ifp->if_vlantrunk == NULL) {
754 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
756 /* Clear before possibly re-entering ether_input(). */
757 m->m_flags &= ~M_PROMISC;
758 (*vlan_input_p)(ifp, m);
763 * Pass promiscuously received frames to the upper layer if the user
764 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
766 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
772 * Reset layer specific mbuf flags to avoid confusing upper layers.
773 * Strip off Ethernet header.
775 m->m_flags &= ~M_VLANTAG;
777 m_adj(m, ETHER_HDR_LEN);
780 * Dispatch frame to upper layer.
782 switch (ether_type) {
785 if ((m = ip_fastforward(m)) == NULL)
791 if (ifp->if_flags & IFF_NOARP) {
792 /* Discard packet if ARP is disabled on interface */
801 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
818 #endif /* NETATALK */
821 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
824 #if defined(NETATALK)
825 if (ether_type > ETHERMTU)
827 l = mtod(m, struct llc *);
828 if (l->llc_dsap == LLC_SNAP_LSAP &&
829 l->llc_ssap == LLC_SNAP_LSAP &&
830 l->llc_control == LLC_UI) {
831 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
832 sizeof(at_org_code)) == 0 &&
833 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
834 m_adj(m, LLC_SNAPFRAMELEN);
838 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
839 sizeof(aarp_org_code)) == 0 &&
840 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
841 m_adj(m, LLC_SNAPFRAMELEN);
846 #endif /* NETATALK */
849 netisr_dispatch(isr, m);
854 * Packet is to be discarded. If netgraph is present,
855 * hand the packet to it for last chance processing;
856 * otherwise dispose of it.
858 if (IFP2AC(ifp)->ac_netgraph != NULL) {
859 KASSERT(ng_ether_input_orphan_p != NULL,
860 ("ng_ether_input_orphan_p is NULL"));
862 * Put back the ethernet header so netgraph has a
863 * consistent view of inbound packets.
865 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
866 (*ng_ether_input_orphan_p)(ifp, m);
873 * Convert Ethernet address to printable (loggable) representation.
874 * This routine is for compatibility; it's better to just use
876 * printf("%6D", <pointer to address>, ":");
878 * since there's no static buffer involved.
881 ether_sprintf(const u_char *ap)
883 static char etherbuf[18];
884 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
889 * Perform common duties while attaching to interface list
892 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
896 struct sockaddr_dl *sdl;
898 ifp->if_addrlen = ETHER_ADDR_LEN;
899 ifp->if_hdrlen = ETHER_HDR_LEN;
901 ifp->if_mtu = ETHERMTU;
902 ifp->if_output = ether_output;
903 ifp->if_input = ether_input;
904 ifp->if_resolvemulti = ether_resolvemulti;
906 ifp->if_reassign = ether_reassign;
908 if (ifp->if_baudrate == 0)
909 ifp->if_baudrate = IF_Mbps(10); /* just a default */
910 ifp->if_broadcastaddr = etherbroadcastaddr;
913 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
914 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
915 sdl->sdl_type = IFT_ETHER;
916 sdl->sdl_alen = ifp->if_addrlen;
917 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
919 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
920 if (ng_ether_attach_p != NULL)
921 (*ng_ether_attach_p)(ifp);
923 /* Announce Ethernet MAC address if non-zero. */
924 for (i = 0; i < ifp->if_addrlen; i++)
927 if (i != ifp->if_addrlen)
928 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
930 uuid_ether_add(LLADDR(sdl));
934 * Perform common duties while detaching an Ethernet interface
937 ether_ifdetach(struct ifnet *ifp)
939 struct sockaddr_dl *sdl;
941 sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
942 uuid_ether_del(LLADDR(sdl));
944 if (IFP2AC(ifp)->ac_netgraph != NULL) {
945 KASSERT(ng_ether_detach_p != NULL,
946 ("ng_ether_detach_p is NULL"));
947 (*ng_ether_detach_p)(ifp);
956 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
959 if (IFP2AC(ifp)->ac_netgraph != NULL) {
960 KASSERT(ng_ether_detach_p != NULL,
961 ("ng_ether_detach_p is NULL"));
962 (*ng_ether_detach_p)(ifp);
965 if (ng_ether_attach_p != NULL) {
966 CURVNET_SET_QUIET(new_vnet);
967 (*ng_ether_attach_p)(ifp);
973 SYSCTL_DECL(_net_link);
974 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
978 * This is for reference. We have a table-driven version
979 * of the little-endian crc32 generator, which is faster
980 * than the double-loop.
983 ether_crc32_le(const uint8_t *buf, size_t len)
990 crc = 0xffffffff; /* initial value */
992 for (i = 0; i < len; i++) {
993 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
994 carry = (crc ^ data) & 1;
997 crc = (crc ^ ETHER_CRC_POLY_LE);
1005 ether_crc32_le(const uint8_t *buf, size_t len)
1007 static const uint32_t crctab[] = {
1008 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1009 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1010 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1011 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1016 crc = 0xffffffff; /* initial value */
1018 for (i = 0; i < len; i++) {
1020 crc = (crc >> 4) ^ crctab[crc & 0xf];
1021 crc = (crc >> 4) ^ crctab[crc & 0xf];
1029 ether_crc32_be(const uint8_t *buf, size_t len)
1032 uint32_t crc, carry;
1036 crc = 0xffffffff; /* initial value */
1038 for (i = 0; i < len; i++) {
1039 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1040 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1043 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1051 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1053 struct ifaddr *ifa = (struct ifaddr *) data;
1054 struct ifreq *ifr = (struct ifreq *) data;
1059 ifp->if_flags |= IFF_UP;
1061 switch (ifa->ifa_addr->sa_family) {
1064 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1065 arp_ifinit(ifp, ifa);
1070 * XXX - This code is probably wrong
1074 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1076 if (ipx_nullhost(*ina))
1081 bcopy((caddr_t) ina->x_host.c_host,
1082 (caddr_t) IF_LLADDR(ifp),
1089 ifp->if_init(ifp->if_softc);
1094 ifp->if_init(ifp->if_softc);
1101 struct sockaddr *sa;
1103 sa = (struct sockaddr *) & ifr->ifr_data;
1104 bcopy(IF_LLADDR(ifp),
1105 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1111 * Set the interface MTU.
1113 if (ifr->ifr_mtu > ETHERMTU) {
1116 ifp->if_mtu = ifr->ifr_mtu;
1120 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1127 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1128 struct sockaddr *sa)
1130 struct sockaddr_dl *sdl;
1132 struct sockaddr_in *sin;
1135 struct sockaddr_in6 *sin6;
1139 switch(sa->sa_family) {
1142 * No mapping needed. Just check that it's a valid MC address.
1144 sdl = (struct sockaddr_dl *)sa;
1145 e_addr = LLADDR(sdl);
1146 if (!ETHER_IS_MULTICAST(e_addr))
1147 return EADDRNOTAVAIL;
1153 sin = (struct sockaddr_in *)sa;
1154 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1155 return EADDRNOTAVAIL;
1156 sdl = malloc(sizeof *sdl, M_IFMADDR,
1160 sdl->sdl_len = sizeof *sdl;
1161 sdl->sdl_family = AF_LINK;
1162 sdl->sdl_index = ifp->if_index;
1163 sdl->sdl_type = IFT_ETHER;
1164 sdl->sdl_alen = ETHER_ADDR_LEN;
1165 e_addr = LLADDR(sdl);
1166 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1167 *llsa = (struct sockaddr *)sdl;
1172 sin6 = (struct sockaddr_in6 *)sa;
1173 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1175 * An IP6 address of 0 means listen to all
1176 * of the Ethernet multicast address used for IP6.
1177 * (This is used for multicast routers.)
1179 ifp->if_flags |= IFF_ALLMULTI;
1183 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1184 return EADDRNOTAVAIL;
1185 sdl = malloc(sizeof *sdl, M_IFMADDR,
1189 sdl->sdl_len = sizeof *sdl;
1190 sdl->sdl_family = AF_LINK;
1191 sdl->sdl_index = ifp->if_index;
1192 sdl->sdl_type = IFT_ETHER;
1193 sdl->sdl_alen = ETHER_ADDR_LEN;
1194 e_addr = LLADDR(sdl);
1195 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1196 *llsa = (struct sockaddr *)sdl;
1202 * Well, the text isn't quite right, but it's the name
1205 return EAFNOSUPPORT;
1210 ether_alloc(u_char type, struct ifnet *ifp)
1214 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1221 ether_free(void *com, u_char type)
1224 free(com, M_ARPCOM);
1228 ether_modevent(module_t mod, int type, void *data)
1233 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1236 if_deregister_com_alloc(IFT_ETHER);
1245 static moduledata_t ether_mod = {
1252 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1254 struct ether_vlan_header vlan;
1257 KASSERT((m->m_flags & M_VLANTAG) != 0,
1258 ("%s: vlan information not present", __func__));
1259 KASSERT(m->m_len >= sizeof(struct ether_header),
1260 ("%s: mbuf not large enough for header", __func__));
1261 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1262 vlan.evl_proto = vlan.evl_encap_proto;
1263 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1264 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1265 m->m_len -= sizeof(struct ether_header);
1266 m->m_data += sizeof(struct ether_header);
1268 * If a data link has been supplied by the caller, then we will need to
1269 * re-create a stack allocated mbuf chain with the following structure:
1271 * (1) mbuf #1 will contain the supplied data link
1272 * (2) mbuf #2 will contain the vlan header
1273 * (3) mbuf #3 will contain the original mbuf's packet data
1275 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1279 mv.m_data = (caddr_t)&vlan;
1280 mv.m_len = sizeof(vlan);
1286 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1287 m->m_len += sizeof(struct ether_header);
1288 m->m_data -= sizeof(struct ether_header);
1292 ether_vlanencap(struct mbuf *m, uint16_t tag)
1294 struct ether_vlan_header *evl;
1296 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1299 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1301 if (m->m_len < sizeof(*evl)) {
1302 m = m_pullup(m, sizeof(*evl));
1308 * Transform the Ethernet header into an Ethernet header
1309 * with 802.1Q encapsulation.
1311 evl = mtod(m, struct ether_vlan_header *);
1312 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1313 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1314 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1315 evl->evl_tag = htons(tag);
1319 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1320 MODULE_VERSION(ether, 1);