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>
43 #include <sys/eventhandler.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
49 #include <sys/random.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/sysctl.h>
56 #include <net/if_arp.h>
57 #include <net/netisr.h>
58 #include <net/route.h>
59 #include <net/if_llc.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
63 #include <net/ethernet.h>
64 #include <net/if_bridgevar.h>
65 #include <net/if_vlan_var.h>
66 #include <net/if_llatbl.h>
70 #include <netpfil/pf/pf_mtag.h>
72 #if defined(INET) || defined(INET6)
73 #include <netinet/in.h>
74 #include <netinet/in_var.h>
75 #include <netinet/if_ether.h>
76 #include <netinet/ip_carp.h>
77 #include <netinet/ip_var.h>
80 #include <netinet6/nd6.h>
84 #include <netipx/ipx.h>
85 #include <netipx/ipx_if.h>
88 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
89 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
90 const struct sockaddr *dst, short *tp, int *hlen);
93 #include <netatalk/at.h>
94 #include <netatalk/at_var.h>
95 #include <netatalk/at_extern.h>
97 #define llc_snap_org_code llc_un.type_snap.org_code
98 #define llc_snap_ether_type llc_un.type_snap.ether_type
100 extern u_char at_org_code[3];
101 extern u_char aarp_org_code[3];
102 #endif /* NETATALK */
104 #include <security/mac/mac_framework.h>
107 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
108 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
111 VNET_DEFINE(struct pfil_head, link_pfil_hook); /* Packet filter hooks */
113 /* netgraph node hooks for ng_ether(4) */
114 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
115 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
116 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
117 void (*ng_ether_attach_p)(struct ifnet *ifp);
118 void (*ng_ether_detach_p)(struct ifnet *ifp);
120 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
122 /* if_bridge(4) support */
123 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
124 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
125 struct sockaddr *, struct rtentry *);
126 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
128 /* if_lagg(4) support */
129 struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
131 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
132 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
134 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
137 static void ether_reassign(struct ifnet *, struct vnet *, char *);
140 /* XXX: should be in an arp support file, not here */
141 static MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
143 #define ETHER_IS_BROADCAST(addr) \
144 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
146 #define senderr(e) do { error = (e); goto bad;} while (0)
149 update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
153 if (src->m_pkthdr.csum_flags & CSUM_IP)
154 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
155 if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
156 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
157 if (src->m_pkthdr.csum_flags & CSUM_SCTP)
158 csum_flags |= CSUM_SCTP_VALID;
159 dst->m_pkthdr.csum_flags |= csum_flags;
160 if (csum_flags & CSUM_DATA_VALID)
161 dst->m_pkthdr.csum_data = 0xffff;
165 * Ethernet output routine.
166 * Encapsulate a packet of type family for the local net.
167 * Use trailer local net encapsulation if enough data in first
168 * packet leaves a multiple of 512 bytes of data in remainder.
171 ether_output(struct ifnet *ifp, struct mbuf *m,
172 const struct sockaddr *dst, struct route *ro)
175 int error = 0, hdrcmplt = 0;
176 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
177 struct llentry *lle = NULL;
178 struct rtentry *rt0 = NULL;
179 struct ether_header *eh;
182 int hlen; /* link layer header length */
185 if (!(m->m_flags & (M_BCAST | M_MCAST)))
190 error = mac_ifnet_check_transmit(ifp, m);
196 if (ifp->if_flags & IFF_MONITOR)
198 if (!((ifp->if_flags & IFF_UP) &&
199 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
202 hlen = ETHER_HDR_LEN;
203 switch (dst->sa_family) {
206 if (lle != NULL && (lle->la_flags & LLE_VALID))
207 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
209 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
211 return (error == EWOULDBLOCK ? 0 : error);
212 type = htons(ETHERTYPE_IP);
217 ah = mtod(m, struct arphdr *);
218 ah->ar_hrd = htons(ARPHRD_ETHER);
220 loop_copy = 0; /* if this is for us, don't do it */
222 switch(ntohs(ah->ar_op)) {
223 case ARPOP_REVREQUEST:
225 type = htons(ETHERTYPE_REVARP);
230 type = htons(ETHERTYPE_ARP);
234 if (m->m_flags & M_BCAST)
235 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
237 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
244 if (lle != NULL && (lle->la_flags & LLE_VALID))
245 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
247 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
250 type = htons(ETHERTYPE_IPV6);
256 error = ef_outputp(ifp, &m, dst, &type, &hlen);
260 type = htons(ETHERTYPE_IPX);
261 bcopy(&((const struct sockaddr_ipx *)dst)->sipx_addr.x_host,
262 edst, sizeof (edst));
268 struct at_ifaddr *aa;
270 if ((aa = at_ifawithnet((const struct sockaddr_at *)dst)) == NULL)
271 senderr(EHOSTUNREACH); /* XXX */
272 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
273 ifa_free(&aa->aa_ifa);
277 * In the phase 2 case, need to prepend an mbuf for the llc header.
279 if ( aa->aa_flags & AFA_PHASE2 ) {
282 ifa_free(&aa->aa_ifa);
283 M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
286 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
287 llc.llc_control = LLC_UI;
288 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
289 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
290 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
291 type = htons(m->m_pkthdr.len);
292 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
294 ifa_free(&aa->aa_ifa);
295 type = htons(ETHERTYPE_AT);
299 #endif /* NETATALK */
301 case pseudo_AF_HDRCMPLT:
303 const struct ether_header *eh;
306 eh = (const struct ether_header *)dst->sa_data;
307 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
311 loop_copy = 0; /* if this is for us, don't do it */
312 eh = (const struct ether_header *)dst->sa_data;
313 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
314 type = eh->ether_type;
318 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
319 senderr(EAFNOSUPPORT);
322 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
323 update_mbuf_csumflags(m, m);
324 return (if_simloop(ifp, m, dst->sa_family, 0));
328 * Add local net header. If no space in first mbuf,
331 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
334 eh = mtod(m, struct ether_header *);
335 (void)memcpy(&eh->ether_type, &type,
336 sizeof(eh->ether_type));
337 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
339 (void)memcpy(eh->ether_shost, esrc,
340 sizeof(eh->ether_shost));
342 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
343 sizeof(eh->ether_shost));
346 * If a simplex interface, and the packet is being sent to our
347 * Ethernet address or a broadcast address, loopback a copy.
348 * XXX To make a simplex device behave exactly like a duplex
349 * device, we should copy in the case of sending to our own
350 * ethernet address (thus letting the original actually appear
351 * on the wire). However, we don't do that here for security
352 * reasons and compatibility with the original behavior.
354 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
355 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
356 if (m->m_flags & M_BCAST) {
360 * Because if_simloop() modifies the packet, we need a
361 * writable copy through m_dup() instead of a readonly
362 * one as m_copy[m] would give us. The alternative would
363 * be to modify if_simloop() to handle the readonly mbuf,
364 * but performancewise it is mostly equivalent (trading
365 * extra data copying vs. extra locking).
367 * XXX This is a local workaround. A number of less
368 * often used kernel parts suffer from the same bug.
369 * See PR kern/105943 for a proposed general solution.
371 if ((n = m_dup(m, M_NOWAIT)) != NULL) {
372 update_mbuf_csumflags(m, n);
373 (void)if_simloop(ifp, n, dst->sa_family, hlen);
376 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
377 ETHER_ADDR_LEN) == 0) {
378 update_mbuf_csumflags(m, m);
379 (void) if_simloop(ifp, m, dst->sa_family, hlen);
380 return (0); /* XXX */
385 * Bridges require special output handling.
387 if (ifp->if_bridge) {
388 BRIDGE_OUTPUT(ifp, m, error);
392 #if defined(INET) || defined(INET6)
394 (error = (*carp_output_p)(ifp, m, dst)))
398 /* Handle ng_ether(4) processing, if any */
399 if (IFP2AC(ifp)->ac_netgraph != NULL) {
400 KASSERT(ng_ether_output_p != NULL,
401 ("ng_ether_output_p is NULL"));
402 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
411 /* Continue with link-layer output */
412 return ether_output_frame(ifp, m);
416 * Ethernet link layer output routine to send a raw frame to the device.
418 * This assumes that the 14 byte Ethernet header is present and contiguous
419 * in the first mbuf (if BRIDGE'ing).
422 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
426 if (PFIL_HOOKED(&V_link_pfil_hook)) {
427 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_OUT, NULL);
437 * Queue message on interface, update output statistics if
438 * successful, and start output if interface not yet active.
440 return ((ifp->if_transmit)(ifp, m));
443 #if defined(INET) || defined(INET6)
447 * Process a received Ethernet packet; the packet is in the
448 * mbuf chain m with the ethernet header at the front.
451 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
453 struct ether_header *eh;
456 if ((ifp->if_flags & IFF_UP) == 0) {
461 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
462 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
468 * Do consistency checks to verify assumptions
469 * made by code past this point.
471 if ((m->m_flags & M_PKTHDR) == 0) {
472 if_printf(ifp, "discard frame w/o packet header\n");
477 if (m->m_len < ETHER_HDR_LEN) {
478 /* XXX maybe should pullup? */
479 if_printf(ifp, "discard frame w/o leading ethernet "
480 "header (len %u pkt len %u)\n",
481 m->m_len, m->m_pkthdr.len);
486 eh = mtod(m, struct ether_header *);
487 etype = ntohs(eh->ether_type);
488 if (m->m_pkthdr.rcvif == NULL) {
489 if_printf(ifp, "discard frame w/o interface pointer\n");
495 if (m->m_pkthdr.rcvif != ifp) {
496 if_printf(ifp, "Warning, frame marked as received on %s\n",
497 m->m_pkthdr.rcvif->if_xname);
501 CURVNET_SET_QUIET(ifp->if_vnet);
503 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
504 if (ETHER_IS_BROADCAST(eh->ether_dhost))
505 m->m_flags |= M_BCAST;
507 m->m_flags |= M_MCAST;
513 * Tag the mbuf with an appropriate MAC label before any other
514 * consumers can get to it.
516 mac_ifnet_create_mbuf(ifp, m);
520 * Give bpf a chance at the packet.
522 ETHER_BPF_MTAP(ifp, m);
525 * If the CRC is still on the packet, trim it off. We do this once
526 * and once only in case we are re-entered. Nothing else on the
527 * Ethernet receive path expects to see the FCS.
529 if (m->m_flags & M_HASFCS) {
530 m_adj(m, -ETHER_CRC_LEN);
531 m->m_flags &= ~M_HASFCS;
534 if (!(ifp->if_capenable & IFCAP_HWSTATS))
535 ifp->if_ibytes += m->m_pkthdr.len;
537 /* Allow monitor mode to claim this frame, after stats are updated. */
538 if (ifp->if_flags & IFF_MONITOR) {
544 /* Handle input from a lagg(4) port */
545 if (ifp->if_type == IFT_IEEE8023ADLAG) {
546 KASSERT(lagg_input_p != NULL,
547 ("%s: if_lagg not loaded!", __func__));
548 m = (*lagg_input_p)(ifp, m);
550 ifp = m->m_pkthdr.rcvif;
558 * If the hardware did not process an 802.1Q tag, do this now,
559 * to allow 802.1P priority frames to be passed to the main input
561 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
563 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
564 struct ether_vlan_header *evl;
566 if (m->m_len < sizeof(*evl) &&
567 (m = m_pullup(m, sizeof(*evl))) == NULL) {
569 if_printf(ifp, "cannot pullup VLAN header\n");
577 evl = mtod(m, struct ether_vlan_header *);
578 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
579 m->m_flags |= M_VLANTAG;
581 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
582 ETHER_HDR_LEN - ETHER_TYPE_LEN);
583 m_adj(m, ETHER_VLAN_ENCAP_LEN);
584 eh = mtod(m, struct ether_header *);
587 M_SETFIB(m, ifp->if_fib);
589 /* Allow ng_ether(4) to claim this frame. */
590 if (IFP2AC(ifp)->ac_netgraph != NULL) {
591 KASSERT(ng_ether_input_p != NULL,
592 ("%s: ng_ether_input_p is NULL", __func__));
593 m->m_flags &= ~M_PROMISC;
594 (*ng_ether_input_p)(ifp, &m);
599 eh = mtod(m, struct ether_header *);
603 * Allow if_bridge(4) to claim this frame.
604 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
605 * and the frame should be delivered locally.
607 if (ifp->if_bridge != NULL) {
608 m->m_flags &= ~M_PROMISC;
609 BRIDGE_INPUT(ifp, m);
614 eh = mtod(m, struct ether_header *);
617 #if defined(INET) || defined(INET6)
619 * Clear M_PROMISC on frame so that carp(4) will see it when the
620 * mbuf flows up to Layer 3.
621 * FreeBSD's implementation of carp(4) uses the inprotosw
622 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
623 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
624 * is outside the scope of the M_PROMISC test below.
625 * TODO: Maintain a hash table of ethernet addresses other than
626 * ether_dhost which may be active on this ifp.
628 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
629 m->m_flags &= ~M_PROMISC;
634 * If the frame received was not for our MAC address, set the
635 * M_PROMISC flag on the mbuf chain. The frame may need to
636 * be seen by the rest of the Ethernet input path in case of
637 * re-entry (e.g. bridge, vlan, netgraph) but should not be
638 * seen by upper protocol layers.
640 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
641 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
642 m->m_flags |= M_PROMISC;
645 if (harvest.ethernet)
646 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_ETHER);
653 * Ethernet input dispatch; by default, direct dispatch here regardless of
654 * global configuration.
657 ether_nh_input(struct mbuf *m)
660 ether_input_internal(m->m_pkthdr.rcvif, m);
663 static struct netisr_handler ether_nh = {
665 .nh_handler = ether_nh_input,
666 .nh_proto = NETISR_ETHER,
667 .nh_policy = NETISR_POLICY_SOURCE,
668 .nh_dispatch = NETISR_DISPATCH_DIRECT,
672 ether_init(__unused void *arg)
675 netisr_register(ðer_nh);
677 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
680 vnet_ether_init(__unused void *arg)
684 /* Initialize packet filter hooks. */
685 V_link_pfil_hook.ph_type = PFIL_TYPE_AF;
686 V_link_pfil_hook.ph_af = AF_LINK;
687 if ((i = pfil_head_register(&V_link_pfil_hook)) != 0)
688 printf("%s: WARNING: unable to register pfil link hook, "
689 "error %d\n", __func__, i);
691 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
692 vnet_ether_init, NULL);
695 vnet_ether_destroy(__unused void *arg)
699 if ((i = pfil_head_unregister(&V_link_pfil_hook)) != 0)
700 printf("%s: WARNING: unable to unregister pfil link hook, "
701 "error %d\n", __func__, i);
703 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
704 vnet_ether_destroy, NULL);
709 ether_input(struct ifnet *ifp, struct mbuf *m)
713 * We will rely on rcvif being set properly in the deferred context,
714 * so assert it is correct here.
716 KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
718 netisr_dispatch(NETISR_ETHER, m);
722 * Upper layer processing for a received Ethernet packet.
725 ether_demux(struct ifnet *ifp, struct mbuf *m)
727 struct ether_header *eh;
730 #if defined(NETATALK)
734 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
736 /* Do not grab PROMISC frames in case we are re-entered. */
737 if (PFIL_HOOKED(&V_link_pfil_hook) && !(m->m_flags & M_PROMISC)) {
738 i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_IN, NULL);
740 if (i != 0 || m == NULL)
744 eh = mtod(m, struct ether_header *);
745 ether_type = ntohs(eh->ether_type);
748 * If this frame has a VLAN tag other than 0, call vlan_input()
749 * if its module is loaded. Otherwise, drop.
751 if ((m->m_flags & M_VLANTAG) &&
752 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
753 if (ifp->if_vlantrunk == NULL) {
758 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
760 /* Clear before possibly re-entering ether_input(). */
761 m->m_flags &= ~M_PROMISC;
762 (*vlan_input_p)(ifp, m);
767 * Pass promiscuously received frames to the upper layer if the user
768 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
770 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
776 * Reset layer specific mbuf flags to avoid confusing upper layers.
777 * Strip off Ethernet header.
779 m->m_flags &= ~M_VLANTAG;
781 m_adj(m, ETHER_HDR_LEN);
784 * Dispatch frame to upper layer.
786 switch (ether_type) {
789 if ((m = ip_fastforward(m)) == NULL)
795 if (ifp->if_flags & IFF_NOARP) {
796 /* Discard packet if ARP is disabled on interface */
805 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
822 #endif /* NETATALK */
825 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
828 #if defined(NETATALK)
829 if (ether_type > ETHERMTU)
831 l = mtod(m, struct llc *);
832 if (l->llc_dsap == LLC_SNAP_LSAP &&
833 l->llc_ssap == LLC_SNAP_LSAP &&
834 l->llc_control == LLC_UI) {
835 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
836 sizeof(at_org_code)) == 0 &&
837 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
838 m_adj(m, LLC_SNAPFRAMELEN);
842 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
843 sizeof(aarp_org_code)) == 0 &&
844 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
845 m_adj(m, LLC_SNAPFRAMELEN);
850 #endif /* NETATALK */
853 netisr_dispatch(isr, m);
858 * Packet is to be discarded. If netgraph is present,
859 * hand the packet to it for last chance processing;
860 * otherwise dispose of it.
862 if (IFP2AC(ifp)->ac_netgraph != NULL) {
863 KASSERT(ng_ether_input_orphan_p != NULL,
864 ("ng_ether_input_orphan_p is NULL"));
866 * Put back the ethernet header so netgraph has a
867 * consistent view of inbound packets.
869 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
870 (*ng_ether_input_orphan_p)(ifp, m);
877 * Convert Ethernet address to printable (loggable) representation.
878 * This routine is for compatibility; it's better to just use
880 * printf("%6D", <pointer to address>, ":");
882 * since there's no static buffer involved.
885 ether_sprintf(const u_char *ap)
887 static char etherbuf[18];
888 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
893 * Perform common duties while attaching to interface list
896 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
900 struct sockaddr_dl *sdl;
902 ifp->if_addrlen = ETHER_ADDR_LEN;
903 ifp->if_hdrlen = ETHER_HDR_LEN;
905 ifp->if_mtu = ETHERMTU;
906 ifp->if_output = ether_output;
907 ifp->if_input = ether_input;
908 ifp->if_resolvemulti = ether_resolvemulti;
910 ifp->if_reassign = ether_reassign;
912 if (ifp->if_baudrate == 0)
913 ifp->if_baudrate = IF_Mbps(10); /* just a default */
914 ifp->if_broadcastaddr = etherbroadcastaddr;
917 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
918 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
919 sdl->sdl_type = IFT_ETHER;
920 sdl->sdl_alen = ifp->if_addrlen;
921 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
923 if (ifp->if_hw_addr != NULL)
924 bcopy(lla, ifp->if_hw_addr, ifp->if_addrlen);
926 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
927 if (ng_ether_attach_p != NULL)
928 (*ng_ether_attach_p)(ifp);
930 /* Announce Ethernet MAC address if non-zero. */
931 for (i = 0; i < ifp->if_addrlen; i++)
934 if (i != ifp->if_addrlen)
935 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
937 uuid_ether_add(LLADDR(sdl));
939 /* Add necessary bits are setup; announce it now. */
940 EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
941 if (IS_DEFAULT_VNET(curvnet))
942 devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
946 * Perform common duties while detaching an Ethernet interface
949 ether_ifdetach(struct ifnet *ifp)
951 struct sockaddr_dl *sdl;
953 sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
954 uuid_ether_del(LLADDR(sdl));
956 if (IFP2AC(ifp)->ac_netgraph != NULL) {
957 KASSERT(ng_ether_detach_p != NULL,
958 ("ng_ether_detach_p is NULL"));
959 (*ng_ether_detach_p)(ifp);
968 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
971 if (IFP2AC(ifp)->ac_netgraph != NULL) {
972 KASSERT(ng_ether_detach_p != NULL,
973 ("ng_ether_detach_p is NULL"));
974 (*ng_ether_detach_p)(ifp);
977 if (ng_ether_attach_p != NULL) {
978 CURVNET_SET_QUIET(new_vnet);
979 (*ng_ether_attach_p)(ifp);
985 SYSCTL_DECL(_net_link);
986 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
990 * This is for reference. We have a table-driven version
991 * of the little-endian crc32 generator, which is faster
992 * than the double-loop.
995 ether_crc32_le(const uint8_t *buf, size_t len)
1002 crc = 0xffffffff; /* initial value */
1004 for (i = 0; i < len; i++) {
1005 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1006 carry = (crc ^ data) & 1;
1009 crc = (crc ^ ETHER_CRC_POLY_LE);
1017 ether_crc32_le(const uint8_t *buf, size_t len)
1019 static const uint32_t crctab[] = {
1020 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1021 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1022 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1023 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1028 crc = 0xffffffff; /* initial value */
1030 for (i = 0; i < len; i++) {
1032 crc = (crc >> 4) ^ crctab[crc & 0xf];
1033 crc = (crc >> 4) ^ crctab[crc & 0xf];
1041 ether_crc32_be(const uint8_t *buf, size_t len)
1044 uint32_t crc, carry;
1048 crc = 0xffffffff; /* initial value */
1050 for (i = 0; i < len; i++) {
1051 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1052 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1055 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1063 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1065 struct ifaddr *ifa = (struct ifaddr *) data;
1066 struct ifreq *ifr = (struct ifreq *) data;
1071 ifp->if_flags |= IFF_UP;
1073 switch (ifa->ifa_addr->sa_family) {
1076 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1077 arp_ifinit(ifp, ifa);
1082 * XXX - This code is probably wrong
1086 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1088 if (ipx_nullhost(*ina))
1093 bcopy((caddr_t) ina->x_host.c_host,
1094 (caddr_t) IF_LLADDR(ifp),
1101 ifp->if_init(ifp->if_softc);
1106 ifp->if_init(ifp->if_softc);
1112 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
1118 * Set the interface MTU.
1120 if (ifr->ifr_mtu > ETHERMTU) {
1123 ifp->if_mtu = ifr->ifr_mtu;
1127 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1134 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1135 struct sockaddr *sa)
1137 struct sockaddr_dl *sdl;
1139 struct sockaddr_in *sin;
1142 struct sockaddr_in6 *sin6;
1146 switch(sa->sa_family) {
1149 * No mapping needed. Just check that it's a valid MC address.
1151 sdl = (struct sockaddr_dl *)sa;
1152 e_addr = LLADDR(sdl);
1153 if (!ETHER_IS_MULTICAST(e_addr))
1154 return EADDRNOTAVAIL;
1160 sin = (struct sockaddr_in *)sa;
1161 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1162 return EADDRNOTAVAIL;
1163 sdl = malloc(sizeof *sdl, M_IFMADDR,
1167 sdl->sdl_len = sizeof *sdl;
1168 sdl->sdl_family = AF_LINK;
1169 sdl->sdl_index = ifp->if_index;
1170 sdl->sdl_type = IFT_ETHER;
1171 sdl->sdl_alen = ETHER_ADDR_LEN;
1172 e_addr = LLADDR(sdl);
1173 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1174 *llsa = (struct sockaddr *)sdl;
1179 sin6 = (struct sockaddr_in6 *)sa;
1180 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1182 * An IP6 address of 0 means listen to all
1183 * of the Ethernet multicast address used for IP6.
1184 * (This is used for multicast routers.)
1186 ifp->if_flags |= IFF_ALLMULTI;
1190 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1191 return EADDRNOTAVAIL;
1192 sdl = malloc(sizeof *sdl, M_IFMADDR,
1196 sdl->sdl_len = sizeof *sdl;
1197 sdl->sdl_family = AF_LINK;
1198 sdl->sdl_index = ifp->if_index;
1199 sdl->sdl_type = IFT_ETHER;
1200 sdl->sdl_alen = ETHER_ADDR_LEN;
1201 e_addr = LLADDR(sdl);
1202 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1203 *llsa = (struct sockaddr *)sdl;
1209 * Well, the text isn't quite right, but it's the name
1212 return EAFNOSUPPORT;
1217 ether_alloc(u_char type, struct ifnet *ifp)
1221 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1228 ether_free(void *com, u_char type)
1231 free(com, M_ARPCOM);
1235 ether_modevent(module_t mod, int type, void *data)
1240 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1243 if_deregister_com_alloc(IFT_ETHER);
1252 static moduledata_t ether_mod = {
1259 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1261 struct ether_vlan_header vlan;
1264 KASSERT((m->m_flags & M_VLANTAG) != 0,
1265 ("%s: vlan information not present", __func__));
1266 KASSERT(m->m_len >= sizeof(struct ether_header),
1267 ("%s: mbuf not large enough for header", __func__));
1268 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1269 vlan.evl_proto = vlan.evl_encap_proto;
1270 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1271 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1272 m->m_len -= sizeof(struct ether_header);
1273 m->m_data += sizeof(struct ether_header);
1275 * If a data link has been supplied by the caller, then we will need to
1276 * re-create a stack allocated mbuf chain with the following structure:
1278 * (1) mbuf #1 will contain the supplied data link
1279 * (2) mbuf #2 will contain the vlan header
1280 * (3) mbuf #3 will contain the original mbuf's packet data
1282 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1286 mv.m_data = (caddr_t)&vlan;
1287 mv.m_len = sizeof(vlan);
1293 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1294 m->m_len += sizeof(struct ether_header);
1295 m->m_data -= sizeof(struct ether_header);
1299 ether_vlanencap(struct mbuf *m, uint16_t tag)
1301 struct ether_vlan_header *evl;
1303 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1306 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1308 if (m->m_len < sizeof(*evl)) {
1309 m = m_pullup(m, sizeof(*evl));
1315 * Transform the Ethernet header into an Ethernet header
1316 * with 802.1Q encapsulation.
1318 evl = mtod(m, struct ether_vlan_header *);
1319 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1320 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1321 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1322 evl->evl_tag = htons(tag);
1326 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1327 MODULE_VERSION(ether, 1);