2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
36 #include "opt_inet6.h"
37 #include "opt_netgraph.h"
38 #include "opt_mbuf_profiling.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/devctl.h>
44 #include <sys/eventhandler.h>
46 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
53 #include <sys/random.h>
54 #include <sys/socket.h>
55 #include <sys/sockio.h>
56 #include <sys/sysctl.h>
59 #include <net/ieee_oui.h>
61 #include <net/if_var.h>
62 #include <net/if_arp.h>
63 #include <net/netisr.h>
64 #include <net/route.h>
65 #include <net/if_llc.h>
66 #include <net/if_dl.h>
67 #include <net/if_types.h>
69 #include <net/ethernet.h>
70 #include <net/if_bridgevar.h>
71 #include <net/if_vlan_var.h>
72 #include <net/if_llatbl.h>
74 #include <net/rss_config.h>
77 #include <netpfil/pf/pf_mtag.h>
79 #if defined(INET) || defined(INET6)
80 #include <netinet/in.h>
81 #include <netinet/in_var.h>
82 #include <netinet/if_ether.h>
83 #include <netinet/ip_carp.h>
84 #include <netinet/ip_var.h>
87 #include <netinet6/nd6.h>
89 #include <security/mac/mac_framework.h>
91 #include <crypto/sha1.h>
94 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
95 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
98 VNET_DEFINE(pfil_head_t, link_pfil_head); /* Packet filter hooks */
100 /* netgraph node hooks for ng_ether(4) */
101 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
102 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
103 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
104 void (*ng_ether_attach_p)(struct ifnet *ifp);
105 void (*ng_ether_detach_p)(struct ifnet *ifp);
107 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
109 /* if_bridge(4) support */
110 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
112 /* if_lagg(4) support */
113 struct mbuf *(*lagg_input_ethernet_p)(struct ifnet *, struct mbuf *);
115 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
116 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
118 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
120 static int ether_requestencap(struct ifnet *, struct if_encap_req *);
122 #define senderr(e) do { error = (e); goto bad;} while (0)
125 update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
129 if (src->m_pkthdr.csum_flags & CSUM_IP)
130 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
131 if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
132 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
133 if (src->m_pkthdr.csum_flags & CSUM_SCTP)
134 csum_flags |= CSUM_SCTP_VALID;
135 dst->m_pkthdr.csum_flags |= csum_flags;
136 if (csum_flags & CSUM_DATA_VALID)
137 dst->m_pkthdr.csum_data = 0xffff;
141 * Handle link-layer encapsulation requests.
144 ether_requestencap(struct ifnet *ifp, struct if_encap_req *req)
146 struct ether_header *eh;
149 const u_char *lladdr;
151 if (req->rtype != IFENCAP_LL)
154 if (req->bufsize < ETHER_HDR_LEN)
157 eh = (struct ether_header *)req->buf;
158 lladdr = req->lladdr;
161 switch (req->family) {
163 etype = htons(ETHERTYPE_IP);
166 etype = htons(ETHERTYPE_IPV6);
169 ah = (struct arphdr *)req->hdata;
170 ah->ar_hrd = htons(ARPHRD_ETHER);
172 switch(ntohs(ah->ar_op)) {
173 case ARPOP_REVREQUEST:
175 etype = htons(ETHERTYPE_REVARP);
180 etype = htons(ETHERTYPE_ARP);
184 if (req->flags & IFENCAP_FLAG_BROADCAST)
185 lladdr = ifp->if_broadcastaddr;
188 return (EAFNOSUPPORT);
191 memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
192 memcpy(eh->ether_dhost, lladdr, ETHER_ADDR_LEN);
193 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
194 req->bufsize = sizeof(struct ether_header);
200 ether_resolve_addr(struct ifnet *ifp, struct mbuf *m,
201 const struct sockaddr *dst, struct route *ro, u_char *phdr,
202 uint32_t *pflags, struct llentry **plle)
204 struct ether_header *eh;
205 uint32_t lleflags = 0;
207 #if defined(INET) || defined(INET6)
213 eh = (struct ether_header *)phdr;
215 switch (dst->sa_family) {
218 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
219 error = arpresolve(ifp, 0, m, dst, phdr, &lleflags,
222 if (m->m_flags & M_BCAST)
223 memcpy(eh->ether_dhost, ifp->if_broadcastaddr,
226 const struct in_addr *a;
227 a = &(((const struct sockaddr_in *)dst)->sin_addr);
228 ETHER_MAP_IP_MULTICAST(a, eh->ether_dhost);
230 etype = htons(ETHERTYPE_IP);
231 memcpy(&eh->ether_type, &etype, sizeof(etype));
232 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
238 if ((m->m_flags & M_MCAST) == 0)
239 error = nd6_resolve(ifp, 0, m, dst, phdr, &lleflags,
242 const struct in6_addr *a6;
243 a6 = &(((const struct sockaddr_in6 *)dst)->sin6_addr);
244 ETHER_MAP_IPV6_MULTICAST(a6, eh->ether_dhost);
245 etype = htons(ETHERTYPE_IPV6);
246 memcpy(&eh->ether_type, &etype, sizeof(etype));
247 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
252 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
255 return (EAFNOSUPPORT);
258 if (error == EHOSTDOWN) {
259 if (ro != NULL && (ro->ro_flags & RT_HAS_GW) != 0)
260 error = EHOSTUNREACH;
266 *pflags = RT_MAY_LOOP;
267 if (lleflags & LLE_IFADDR)
274 * Ethernet output routine.
275 * Encapsulate a packet of type family for the local net.
276 * Use trailer local net encapsulation if enough data in first
277 * packet leaves a multiple of 512 bytes of data in remainder.
280 ether_output(struct ifnet *ifp, struct mbuf *m,
281 const struct sockaddr *dst, struct route *ro)
284 char linkhdr[ETHER_HDR_LEN], *phdr;
285 struct ether_header *eh;
288 int hlen; /* link layer header length */
290 struct llentry *lle = NULL;
296 /* XXX BPF uses ro_prepend */
297 if (ro->ro_prepend != NULL) {
298 phdr = ro->ro_prepend;
300 } else if (!(m->m_flags & (M_BCAST | M_MCAST))) {
301 if ((ro->ro_flags & RT_LLE_CACHE) != 0) {
304 (lle->la_flags & LLE_VALID) == 0) {
306 lle = NULL; /* redundant */
310 /* if we lookup, keep cache */
314 * Notify LLE code that
318 llentry_mark_used(lle);
321 phdr = lle->r_linkdata;
322 hlen = lle->r_hdrlen;
323 pflags = lle->r_flags;
329 error = mac_ifnet_check_transmit(ifp, m);
335 if (ifp->if_flags & IFF_MONITOR)
337 if (!((ifp->if_flags & IFF_UP) &&
338 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
342 /* No prepend data supplied. Try to calculate ourselves. */
344 hlen = ETHER_HDR_LEN;
345 error = ether_resolve_addr(ifp, m, dst, ro, phdr, &pflags,
346 addref ? &lle : NULL);
347 if (addref && lle != NULL)
350 return (error == EWOULDBLOCK ? 0 : error);
353 if ((pflags & RT_L2_ME) != 0) {
354 update_mbuf_csumflags(m, m);
355 return (if_simloop(ifp, m, dst->sa_family, 0));
357 loop_copy = (pflags & RT_MAY_LOOP) != 0;
360 * Add local net header. If no space in first mbuf,
363 * Note that we do prepend regardless of RT_HAS_HEADER flag.
364 * This is done because BPF code shifts m_data pointer
365 * to the end of ethernet header prior to calling if_output().
367 M_PREPEND(m, hlen, M_NOWAIT);
370 if ((pflags & RT_HAS_HEADER) == 0) {
371 eh = mtod(m, struct ether_header *);
372 memcpy(eh, phdr, hlen);
376 * If a simplex interface, and the packet is being sent to our
377 * Ethernet address or a broadcast address, loopback a copy.
378 * XXX To make a simplex device behave exactly like a duplex
379 * device, we should copy in the case of sending to our own
380 * ethernet address (thus letting the original actually appear
381 * on the wire). However, we don't do that here for security
382 * reasons and compatibility with the original behavior.
384 if ((m->m_flags & M_BCAST) && loop_copy && (ifp->if_flags & IFF_SIMPLEX) &&
385 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
389 * Because if_simloop() modifies the packet, we need a
390 * writable copy through m_dup() instead of a readonly
391 * one as m_copy[m] would give us. The alternative would
392 * be to modify if_simloop() to handle the readonly mbuf,
393 * but performancewise it is mostly equivalent (trading
394 * extra data copying vs. extra locking).
396 * XXX This is a local workaround. A number of less
397 * often used kernel parts suffer from the same bug.
398 * See PR kern/105943 for a proposed general solution.
400 if ((n = m_dup(m, M_NOWAIT)) != NULL) {
401 update_mbuf_csumflags(m, n);
402 (void)if_simloop(ifp, n, dst->sa_family, hlen);
404 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
408 * Bridges require special output handling.
410 if (ifp->if_bridge) {
411 BRIDGE_OUTPUT(ifp, m, error);
415 #if defined(INET) || defined(INET6)
417 (error = (*carp_output_p)(ifp, m, dst)))
421 /* Handle ng_ether(4) processing, if any */
422 if (ifp->if_l2com != NULL) {
423 KASSERT(ng_ether_output_p != NULL,
424 ("ng_ether_output_p is NULL"));
425 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
434 /* Continue with link-layer output */
435 return ether_output_frame(ifp, m);
439 ether_set_pcp(struct mbuf **mp, struct ifnet *ifp, uint8_t pcp)
441 struct ether_8021q_tag qtag;
442 struct ether_header *eh;
444 eh = mtod(*mp, struct ether_header *);
445 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN ||
446 ntohs(eh->ether_type) == ETHERTYPE_QINQ)
451 qtag.proto = ETHERTYPE_VLAN;
452 if (ether_8021q_frame(mp, ifp, ifp, &qtag))
454 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
459 * Ethernet link layer output routine to send a raw frame to the device.
461 * This assumes that the 14 byte Ethernet header is present and contiguous
462 * in the first mbuf (if BRIDGE'ing).
465 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
470 if (pcp != IFNET_PCP_NONE && ifp->if_type != IFT_L2VLAN &&
471 !ether_set_pcp(&m, ifp, pcp))
474 if (PFIL_HOOKED_OUT(V_link_pfil_head))
475 switch (pfil_run_hooks(V_link_pfil_head, &m, ifp, PFIL_OUT,
484 #if defined(INET6) && defined(INET)
485 /* draft-ietf-6man-ipv6only-flag */
486 /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
487 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
488 struct ether_header *eh;
490 eh = mtod(m, struct ether_header *);
491 switch (ntohs(eh->ether_type)) {
494 case ETHERTYPE_REVARP:
496 return (EAFNOSUPPORT);
505 * Queue message on interface, update output statistics if
506 * successful, and start output if interface not yet active.
508 return ((ifp->if_transmit)(ifp, m));
512 * Process a received Ethernet packet; the packet is in the
513 * mbuf chain m with the ethernet header at the front.
516 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
518 struct ether_header *eh;
521 if ((ifp->if_flags & IFF_UP) == 0) {
526 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
527 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
532 if (m->m_len < ETHER_HDR_LEN) {
533 /* XXX maybe should pullup? */
534 if_printf(ifp, "discard frame w/o leading ethernet "
535 "header (len %u pkt len %u)\n",
536 m->m_len, m->m_pkthdr.len);
537 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
541 eh = mtod(m, struct ether_header *);
542 etype = ntohs(eh->ether_type);
543 random_harvest_queue_ether(m, sizeof(*m));
546 #if defined(INET6) && defined(INET)
547 /* draft-ietf-6man-ipv6only-flag */
548 /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
549 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
553 case ETHERTYPE_REVARP:
563 CURVNET_SET_QUIET(ifp->if_vnet);
565 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
566 if (ETHER_IS_BROADCAST(eh->ether_dhost))
567 m->m_flags |= M_BCAST;
569 m->m_flags |= M_MCAST;
570 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
575 * Tag the mbuf with an appropriate MAC label before any other
576 * consumers can get to it.
578 mac_ifnet_create_mbuf(ifp, m);
582 * Give bpf a chance at the packet.
584 ETHER_BPF_MTAP(ifp, m);
587 * If the CRC is still on the packet, trim it off. We do this once
588 * and once only in case we are re-entered. Nothing else on the
589 * Ethernet receive path expects to see the FCS.
591 if (m->m_flags & M_HASFCS) {
592 m_adj(m, -ETHER_CRC_LEN);
593 m->m_flags &= ~M_HASFCS;
596 if (!(ifp->if_capenable & IFCAP_HWSTATS))
597 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
599 /* Allow monitor mode to claim this frame, after stats are updated. */
600 if (ifp->if_flags & IFF_MONITOR) {
606 /* Handle input from a lagg(4) port */
607 if (ifp->if_type == IFT_IEEE8023ADLAG) {
608 KASSERT(lagg_input_ethernet_p != NULL,
609 ("%s: if_lagg not loaded!", __func__));
610 m = (*lagg_input_ethernet_p)(ifp, m);
612 ifp = m->m_pkthdr.rcvif;
620 * If the hardware did not process an 802.1Q tag, do this now,
621 * to allow 802.1P priority frames to be passed to the main input
624 if ((m->m_flags & M_VLANTAG) == 0 &&
625 ((etype == ETHERTYPE_VLAN) || (etype == ETHERTYPE_QINQ))) {
626 struct ether_vlan_header *evl;
628 if (m->m_len < sizeof(*evl) &&
629 (m = m_pullup(m, sizeof(*evl))) == NULL) {
631 if_printf(ifp, "cannot pullup VLAN header\n");
633 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
638 evl = mtod(m, struct ether_vlan_header *);
639 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
640 m->m_flags |= M_VLANTAG;
642 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
643 ETHER_HDR_LEN - ETHER_TYPE_LEN);
644 m_adj(m, ETHER_VLAN_ENCAP_LEN);
645 eh = mtod(m, struct ether_header *);
648 M_SETFIB(m, ifp->if_fib);
650 /* Allow ng_ether(4) to claim this frame. */
651 if (ifp->if_l2com != NULL) {
652 KASSERT(ng_ether_input_p != NULL,
653 ("%s: ng_ether_input_p is NULL", __func__));
654 m->m_flags &= ~M_PROMISC;
655 (*ng_ether_input_p)(ifp, &m);
660 eh = mtod(m, struct ether_header *);
664 * Allow if_bridge(4) to claim this frame.
665 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
666 * and the frame should be delivered locally.
668 if (ifp->if_bridge != NULL) {
669 m->m_flags &= ~M_PROMISC;
670 BRIDGE_INPUT(ifp, m);
675 eh = mtod(m, struct ether_header *);
678 #if defined(INET) || defined(INET6)
680 * Clear M_PROMISC on frame so that carp(4) will see it when the
681 * mbuf flows up to Layer 3.
682 * FreeBSD's implementation of carp(4) uses the inprotosw
683 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
684 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
685 * is outside the scope of the M_PROMISC test below.
686 * TODO: Maintain a hash table of ethernet addresses other than
687 * ether_dhost which may be active on this ifp.
689 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
690 m->m_flags &= ~M_PROMISC;
695 * If the frame received was not for our MAC address, set the
696 * M_PROMISC flag on the mbuf chain. The frame may need to
697 * be seen by the rest of the Ethernet input path in case of
698 * re-entry (e.g. bridge, vlan, netgraph) but should not be
699 * seen by upper protocol layers.
701 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
702 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
703 m->m_flags |= M_PROMISC;
711 * Ethernet input dispatch; by default, direct dispatch here regardless of
712 * global configuration. However, if RSS is enabled, hook up RSS affinity
713 * so that when deferred or hybrid dispatch is enabled, we can redistribute
716 * XXXRW: Would be nice if the ifnet passed up a flag indicating whether or
717 * not it had already done work distribution via multi-queue. Then we could
718 * direct dispatch in the event load balancing was already complete and
719 * handle the case of interfaces with different capabilities better.
721 * XXXRW: Sort of want an M_DISTRIBUTED flag to avoid multiple distributions
722 * at multiple layers?
724 * XXXRW: For now, enable all this only if RSS is compiled in, although it
725 * works fine without RSS. Need to characterise the performance overhead
726 * of the detour through the netisr code in the event the result is always
730 ether_nh_input(struct mbuf *m)
734 KASSERT(m->m_pkthdr.rcvif != NULL,
735 ("%s: NULL interface pointer", __func__));
736 ether_input_internal(m->m_pkthdr.rcvif, m);
739 static struct netisr_handler ether_nh = {
741 .nh_handler = ether_nh_input,
742 .nh_proto = NETISR_ETHER,
744 .nh_policy = NETISR_POLICY_CPU,
745 .nh_dispatch = NETISR_DISPATCH_DIRECT,
746 .nh_m2cpuid = rss_m2cpuid,
748 .nh_policy = NETISR_POLICY_SOURCE,
749 .nh_dispatch = NETISR_DISPATCH_DIRECT,
754 ether_init(__unused void *arg)
757 netisr_register(ðer_nh);
759 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
762 vnet_ether_init(__unused void *arg)
764 struct pfil_head_args args;
766 args.pa_version = PFIL_VERSION;
767 args.pa_flags = PFIL_IN | PFIL_OUT;
768 args.pa_type = PFIL_TYPE_ETHERNET;
769 args.pa_headname = PFIL_ETHER_NAME;
770 V_link_pfil_head = pfil_head_register(&args);
773 netisr_register_vnet(ðer_nh);
776 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
777 vnet_ether_init, NULL);
781 vnet_ether_pfil_destroy(__unused void *arg)
784 pfil_head_unregister(V_link_pfil_head);
786 VNET_SYSUNINIT(vnet_ether_pfil_uninit, SI_SUB_PROTO_PFIL, SI_ORDER_ANY,
787 vnet_ether_pfil_destroy, NULL);
790 vnet_ether_destroy(__unused void *arg)
793 netisr_unregister_vnet(ðer_nh);
795 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
796 vnet_ether_destroy, NULL);
800 ether_input(struct ifnet *ifp, struct mbuf *m)
802 struct epoch_tracker et;
806 needs_epoch = !(ifp->if_flags & IFF_KNOWSEPOCH);
809 * The drivers are allowed to pass in a chain of packets linked with
810 * m_nextpkt. We split them up into separate packets here and pass
811 * them up. This allows the drivers to amortize the receive lock.
813 CURVNET_SET_QUIET(ifp->if_vnet);
814 if (__predict_false(needs_epoch))
821 * We will rely on rcvif being set properly in the deferred
822 * context, so assert it is correct here.
824 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
825 KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch m %p "
826 "rcvif %p ifp %p", __func__, m, m->m_pkthdr.rcvif, ifp));
827 netisr_dispatch(NETISR_ETHER, m);
830 if (__predict_false(needs_epoch))
836 * Upper layer processing for a received Ethernet packet.
839 ether_demux(struct ifnet *ifp, struct mbuf *m)
841 struct ether_header *eh;
846 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
848 /* Do not grab PROMISC frames in case we are re-entered. */
849 if (PFIL_HOOKED_IN(V_link_pfil_head) && !(m->m_flags & M_PROMISC)) {
850 i = pfil_run_hooks(V_link_pfil_head, &m, ifp, PFIL_IN, NULL);
851 if (i != 0 || m == NULL)
855 eh = mtod(m, struct ether_header *);
856 ether_type = ntohs(eh->ether_type);
859 * If this frame has a VLAN tag other than 0, call vlan_input()
860 * if its module is loaded. Otherwise, drop.
862 if ((m->m_flags & M_VLANTAG) &&
863 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
864 if (ifp->if_vlantrunk == NULL) {
865 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
869 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
871 /* Clear before possibly re-entering ether_input(). */
872 m->m_flags &= ~M_PROMISC;
873 (*vlan_input_p)(ifp, m);
878 * Pass promiscuously received frames to the upper layer if the user
879 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
881 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
887 * Reset layer specific mbuf flags to avoid confusing upper layers.
888 * Strip off Ethernet header.
890 m->m_flags &= ~M_VLANTAG;
892 m_adj(m, ETHER_HDR_LEN);
895 * Dispatch frame to upper layer.
897 switch (ether_type) {
904 if (ifp->if_flags & IFF_NOARP) {
905 /* Discard packet if ARP is disabled on interface */
920 netisr_dispatch(isr, m);
925 * Packet is to be discarded. If netgraph is present,
926 * hand the packet to it for last chance processing;
927 * otherwise dispose of it.
929 if (ifp->if_l2com != NULL) {
930 KASSERT(ng_ether_input_orphan_p != NULL,
931 ("ng_ether_input_orphan_p is NULL"));
933 * Put back the ethernet header so netgraph has a
934 * consistent view of inbound packets.
936 M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
937 (*ng_ether_input_orphan_p)(ifp, m);
944 * Convert Ethernet address to printable (loggable) representation.
945 * This routine is for compatibility; it's better to just use
947 * printf("%6D", <pointer to address>, ":");
949 * since there's no static buffer involved.
952 ether_sprintf(const u_char *ap)
954 static char etherbuf[18];
955 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
960 * Perform common duties while attaching to interface list
963 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
967 struct sockaddr_dl *sdl;
969 ifp->if_addrlen = ETHER_ADDR_LEN;
970 ifp->if_hdrlen = ETHER_HDR_LEN;
971 ifp->if_mtu = ETHERMTU;
973 ifp->if_output = ether_output;
974 ifp->if_input = ether_input;
975 ifp->if_resolvemulti = ether_resolvemulti;
976 ifp->if_requestencap = ether_requestencap;
978 ifp->if_reassign = ether_reassign;
980 if (ifp->if_baudrate == 0)
981 ifp->if_baudrate = IF_Mbps(10); /* just a default */
982 ifp->if_broadcastaddr = etherbroadcastaddr;
985 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
986 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
987 sdl->sdl_type = IFT_ETHER;
988 sdl->sdl_alen = ifp->if_addrlen;
989 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
991 if (ifp->if_hw_addr != NULL)
992 bcopy(lla, ifp->if_hw_addr, ifp->if_addrlen);
994 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
995 if (ng_ether_attach_p != NULL)
996 (*ng_ether_attach_p)(ifp);
998 /* Announce Ethernet MAC address if non-zero. */
999 for (i = 0; i < ifp->if_addrlen; i++)
1002 if (i != ifp->if_addrlen)
1003 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
1005 uuid_ether_add(LLADDR(sdl));
1007 /* Add necessary bits are setup; announce it now. */
1008 EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
1009 if (IS_DEFAULT_VNET(curvnet))
1010 devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
1014 * Perform common duties while detaching an Ethernet interface
1017 ether_ifdetach(struct ifnet *ifp)
1019 struct sockaddr_dl *sdl;
1021 sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
1022 uuid_ether_del(LLADDR(sdl));
1024 if (ifp->if_l2com != NULL) {
1025 KASSERT(ng_ether_detach_p != NULL,
1026 ("ng_ether_detach_p is NULL"));
1027 (*ng_ether_detach_p)(ifp);
1036 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
1039 if (ifp->if_l2com != NULL) {
1040 KASSERT(ng_ether_detach_p != NULL,
1041 ("ng_ether_detach_p is NULL"));
1042 (*ng_ether_detach_p)(ifp);
1045 if (ng_ether_attach_p != NULL) {
1046 CURVNET_SET_QUIET(new_vnet);
1047 (*ng_ether_attach_p)(ifp);
1053 SYSCTL_DECL(_net_link);
1054 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1059 * This is for reference. We have a table-driven version
1060 * of the little-endian crc32 generator, which is faster
1061 * than the double-loop.
1064 ether_crc32_le(const uint8_t *buf, size_t len)
1071 crc = 0xffffffff; /* initial value */
1073 for (i = 0; i < len; i++) {
1074 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1075 carry = (crc ^ data) & 1;
1078 crc = (crc ^ ETHER_CRC_POLY_LE);
1086 ether_crc32_le(const uint8_t *buf, size_t len)
1088 static const uint32_t crctab[] = {
1089 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1090 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1091 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1092 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1097 crc = 0xffffffff; /* initial value */
1099 for (i = 0; i < len; i++) {
1101 crc = (crc >> 4) ^ crctab[crc & 0xf];
1102 crc = (crc >> 4) ^ crctab[crc & 0xf];
1110 ether_crc32_be(const uint8_t *buf, size_t len)
1113 uint32_t crc, carry;
1117 crc = 0xffffffff; /* initial value */
1119 for (i = 0; i < len; i++) {
1120 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1121 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1124 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1132 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1134 struct ifaddr *ifa = (struct ifaddr *) data;
1135 struct ifreq *ifr = (struct ifreq *) data;
1140 ifp->if_flags |= IFF_UP;
1142 switch (ifa->ifa_addr->sa_family) {
1145 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1146 arp_ifinit(ifp, ifa);
1150 ifp->if_init(ifp->if_softc);
1156 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
1162 * Set the interface MTU.
1164 if (ifr->ifr_mtu > ETHERMTU) {
1167 ifp->if_mtu = ifr->ifr_mtu;
1172 error = priv_check(curthread, PRIV_NET_SETLANPCP);
1175 if (ifr->ifr_lan_pcp > 7 &&
1176 ifr->ifr_lan_pcp != IFNET_PCP_NONE) {
1179 ifp->if_pcp = ifr->ifr_lan_pcp;
1180 /* broadcast event about PCP change */
1181 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
1186 ifr->ifr_lan_pcp = ifp->if_pcp;
1190 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1197 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1198 struct sockaddr *sa)
1200 struct sockaddr_dl *sdl;
1202 struct sockaddr_in *sin;
1205 struct sockaddr_in6 *sin6;
1209 switch(sa->sa_family) {
1212 * No mapping needed. Just check that it's a valid MC address.
1214 sdl = (struct sockaddr_dl *)sa;
1215 e_addr = LLADDR(sdl);
1216 if (!ETHER_IS_MULTICAST(e_addr))
1217 return EADDRNOTAVAIL;
1223 sin = (struct sockaddr_in *)sa;
1224 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1225 return EADDRNOTAVAIL;
1226 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1227 sdl->sdl_alen = ETHER_ADDR_LEN;
1228 e_addr = LLADDR(sdl);
1229 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1230 *llsa = (struct sockaddr *)sdl;
1235 sin6 = (struct sockaddr_in6 *)sa;
1236 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1238 * An IP6 address of 0 means listen to all
1239 * of the Ethernet multicast address used for IP6.
1240 * (This is used for multicast routers.)
1242 ifp->if_flags |= IFF_ALLMULTI;
1246 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1247 return EADDRNOTAVAIL;
1248 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1249 sdl->sdl_alen = ETHER_ADDR_LEN;
1250 e_addr = LLADDR(sdl);
1251 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1252 *llsa = (struct sockaddr *)sdl;
1258 * Well, the text isn't quite right, but it's the name
1261 return EAFNOSUPPORT;
1265 static moduledata_t ether_mod = {
1270 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1272 struct ether_vlan_header vlan;
1275 KASSERT((m->m_flags & M_VLANTAG) != 0,
1276 ("%s: vlan information not present", __func__));
1277 KASSERT(m->m_len >= sizeof(struct ether_header),
1278 ("%s: mbuf not large enough for header", __func__));
1279 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1280 vlan.evl_proto = vlan.evl_encap_proto;
1281 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1282 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1283 m->m_len -= sizeof(struct ether_header);
1284 m->m_data += sizeof(struct ether_header);
1286 * If a data link has been supplied by the caller, then we will need to
1287 * re-create a stack allocated mbuf chain with the following structure:
1289 * (1) mbuf #1 will contain the supplied data link
1290 * (2) mbuf #2 will contain the vlan header
1291 * (3) mbuf #3 will contain the original mbuf's packet data
1293 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1297 mv.m_data = (caddr_t)&vlan;
1298 mv.m_len = sizeof(vlan);
1304 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1305 m->m_len += sizeof(struct ether_header);
1306 m->m_data -= sizeof(struct ether_header);
1310 ether_vlanencap_proto(struct mbuf *m, uint16_t tag, uint16_t proto)
1312 struct ether_vlan_header *evl;
1314 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1317 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1319 if (m->m_len < sizeof(*evl)) {
1320 m = m_pullup(m, sizeof(*evl));
1326 * Transform the Ethernet header into an Ethernet header
1327 * with 802.1Q encapsulation.
1329 evl = mtod(m, struct ether_vlan_header *);
1330 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1331 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1332 evl->evl_encap_proto = htons(proto);
1333 evl->evl_tag = htons(tag);
1337 static SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1338 "IEEE 802.1Q VLAN");
1339 static SYSCTL_NODE(_net_link_vlan, PF_LINK, link,
1340 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1343 VNET_DEFINE_STATIC(int, soft_pad);
1344 #define V_soft_pad VNET(soft_pad)
1345 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW | CTLFLAG_VNET,
1346 &VNET_NAME(soft_pad), 0,
1347 "pad short frames before tagging");
1350 * For now, make preserving PCP via an mbuf tag optional, as it increases
1351 * per-packet memory allocations and frees. In the future, it would be
1352 * preferable to reuse ether_vtag for this, or similar.
1354 int vlan_mtag_pcp = 0;
1355 SYSCTL_INT(_net_link_vlan, OID_AUTO, mtag_pcp, CTLFLAG_RW,
1357 "Retain VLAN PCP information as packets are passed up the stack");
1360 ether_8021q_frame(struct mbuf **mp, struct ifnet *ife, struct ifnet *p,
1361 struct ether_8021q_tag *qtag)
1366 static const char pad[8]; /* just zeros */
1369 * Pad the frame to the minimum size allowed if told to.
1370 * This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
1371 * paragraph C.4.4.3.b. It can help to work around buggy
1372 * bridges that violate paragraph C.4.4.3.a from the same
1373 * document, i.e., fail to pad short frames after untagging.
1374 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
1375 * untagging it will produce a 62-byte frame, which is a runt
1376 * and requires padding. There are VLAN-enabled network
1377 * devices that just discard such runts instead or mishandle
1380 if (V_soft_pad && p->if_type == IFT_ETHER) {
1381 for (n = ETHERMIN + ETHER_HDR_LEN - (*mp)->m_pkthdr.len;
1382 n > 0; n -= sizeof(pad)) {
1383 if (!m_append(*mp, min(n, sizeof(pad)), pad))
1389 if_printf(ife, "cannot pad short frame");
1395 * If PCP is set in mbuf, use it
1397 if ((*mp)->m_flags & M_VLANTAG) {
1398 qtag->pcp = EVL_PRIOFTAG((*mp)->m_pkthdr.ether_vtag);
1402 * If underlying interface can do VLAN tag insertion itself,
1403 * just pass the packet along. However, we need some way to
1404 * tell the interface where the packet came from so that it
1405 * knows how to find the VLAN tag to use, so we attach a
1406 * packet tag that holds it.
1408 if (vlan_mtag_pcp && (mtag = m_tag_locate(*mp, MTAG_8021Q,
1409 MTAG_8021Q_PCP_OUT, NULL)) != NULL)
1410 tag = EVL_MAKETAG(qtag->vid, *(uint8_t *)(mtag + 1), 0);
1412 tag = EVL_MAKETAG(qtag->vid, qtag->pcp, 0);
1413 if ((p->if_capenable & IFCAP_VLAN_HWTAGGING) &&
1414 (qtag->proto == ETHERTYPE_VLAN)) {
1415 (*mp)->m_pkthdr.ether_vtag = tag;
1416 (*mp)->m_flags |= M_VLANTAG;
1418 *mp = ether_vlanencap_proto(*mp, tag, qtag->proto);
1420 if_printf(ife, "unable to prepend 802.1Q header");
1428 * Allocate an address from the FreeBSD Foundation OUI. This uses a
1429 * cryptographic hash function on the containing jail's name, UUID and the
1430 * interface name to attempt to provide a unique but stable address.
1431 * Pseudo-interfaces which require a MAC address should use this function to
1432 * allocate non-locally-administered addresses.
1435 ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
1439 char uuid[HOSTUUIDLEN + 1];
1442 char digest[SHA1_RESULTLEN];
1443 char jailname[MAXHOSTNAMELEN];
1445 getcredhostuuid(curthread->td_ucred, uuid, sizeof(uuid));
1446 /* If each (vnet) jail would also have a unique hostuuid this would not
1448 getjailname(curthread->td_ucred, jailname, sizeof(jailname));
1449 sz = asprintf(&buf, M_TEMP, "%s-%s-%s", uuid, if_name(ifp),
1452 /* Fall back to a random mac address. */
1453 arc4rand(hwaddr, sizeof(*hwaddr), 0);
1454 hwaddr->octet[0] = 0x02;
1459 SHA1Update(&ctx, buf, sz);
1460 SHA1Final(digest, &ctx);
1463 addr = ((digest[0] << 16) | (digest[1] << 8) | digest[2]) &
1464 OUI_FREEBSD_GENERATED_MASK;
1465 addr = OUI_FREEBSD(addr);
1466 for (i = 0; i < ETHER_ADDR_LEN; ++i) {
1467 hwaddr->octet[i] = addr >> ((ETHER_ADDR_LEN - i - 1) * 8) &
1472 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1473 MODULE_VERSION(ether, 1);