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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $
35 * $DragonFly: src/sys/net/if_ethersubr.c,v 1.59 2008/05/14 11:59:23 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
42 #include "opt_netgraph.h"
44 #include "opt_ethernet.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/globaldata.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
52 #include <sys/msgport.h>
53 #include <sys/socket.h>
54 #include <sys/sockio.h>
55 #include <sys/sysctl.h>
56 #include <sys/thread.h>
57 #include <sys/thread2.h>
60 #include <net/netisr.h>
61 #include <net/route.h>
62 #include <net/if_llc.h>
63 #include <net/if_dl.h>
64 #include <net/if_types.h>
65 #include <net/ifq_var.h>
67 #include <net/ethernet.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 <net/ipfw/ip_fw.h>
74 #include <net/dummynet/ip_dummynet.h>
77 #include <netinet6/nd6.h>
81 #include <netinet/ip_carp.h>
85 #include <netproto/ipx/ipx.h>
86 #include <netproto/ipx/ipx_if.h>
87 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m);
88 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst,
89 short *tp, int *hlen);
94 #include <netns/ns_if.h>
96 int ether_outputdebug = 0;
97 int ether_inputdebug = 0;
101 #include <netproto/atalk/at.h>
102 #include <netproto/atalk/at_var.h>
103 #include <netproto/atalk/at_extern.h>
105 #define llc_snap_org_code llc_un.type_snap.org_code
106 #define llc_snap_ether_type llc_un.type_snap.ether_type
108 extern u_char at_org_code[3];
109 extern u_char aarp_org_code[3];
110 #endif /* NETATALK */
112 /* netgraph node hooks for ng_ether(4) */
113 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
114 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
115 struct mbuf *m, const struct ether_header *eh);
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 int (*vlan_input_p)(const struct ether_header *eh, struct mbuf *m);
121 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t);
123 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
125 static void ether_restore_header(struct mbuf **, const struct ether_header *,
126 const struct ether_header *);
127 static void ether_demux_chain(struct ifnet *, struct mbuf *,
128 struct mbuf_chain *);
133 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
134 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
135 struct sockaddr *, struct rtentry *);
136 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
138 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
141 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
142 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
145 #define gotoerr(e) do { error = (e); goto bad; } while (0)
146 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
148 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
150 const struct ether_header *eh);
152 static int ether_ipfw;
153 static u_int ether_restore_hdr;
154 static u_int ether_prepend_hdr;
156 SYSCTL_DECL(_net_link);
157 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
158 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
159 ðer_ipfw, 0, "Pass ether pkts through firewall");
160 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW,
161 ðer_restore_hdr, 0, "# of ether header restoration");
162 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW,
163 ðer_prepend_hdr, 0,
164 "# of ether header restoration which prepends mbuf");
167 * Ethernet output routine.
168 * Encapsulate a packet of type family for the local net.
169 * Use trailer local net encapsulation if enough data in first
170 * packet leaves a multiple of 512 bytes of data in remainder.
171 * Assumes that ifp is actually pointer to arpcom structure.
174 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
177 struct ether_header *eh, *deh;
180 int hlen = ETHER_HDR_LEN; /* link layer header length */
181 struct arpcom *ac = IFP2AC(ifp);
184 if (ifp->if_flags & IFF_MONITOR)
186 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
189 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
192 eh = mtod(m, struct ether_header *);
193 edst = eh->ether_dhost;
196 * Fill in the destination ethernet address and frame type.
198 switch (dst->sa_family) {
201 if (!arpresolve(ifp, rt, m, dst, edst))
202 return (0); /* if not yet resolved */
203 eh->ether_type = htons(ETHERTYPE_IP);
208 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
209 return (0); /* Something bad happenned. */
210 eh->ether_type = htons(ETHERTYPE_IPV6);
215 if (ef_outputp != NULL) {
216 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
221 eh->ether_type = htons(ETHERTYPE_IPX);
222 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
223 edst, ETHER_ADDR_LEN);
229 struct at_ifaddr *aa;
231 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
236 * In the phase 2 case, need to prepend an mbuf for
237 * the llc header. Since we must preserve the value
238 * of m, which is passed to us by value, we m_copy()
239 * the first mbuf, and use it for our llc header.
241 if (aa->aa_flags & AFA_PHASE2) {
244 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
245 eh = mtod(m, struct ether_header *);
246 edst = eh->ether_dhost;
247 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
248 llc.llc_control = LLC_UI;
249 bcopy(at_org_code, llc.llc_snap_org_code,
251 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
253 mtod(m, caddr_t) + sizeof(struct ether_header),
255 eh->ether_type = htons(m->m_pkthdr.len);
256 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
258 eh->ether_type = htons(ETHERTYPE_AT);
260 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
269 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
270 eh->ether_type = 0x8137;
272 case 0x0: /* Novell 802.3 */
273 eh->ether_type = htons(m->m_pkthdr.len);
275 case 0xe0e0: /* Novell 802.2 and Token-Ring */
276 M_PREPEND(m, 3, MB_DONTWAIT);
277 eh = mtod(m, struct ether_header *);
278 edst = eh->ether_dhost;
279 eh->ether_type = htons(m->m_pkthdr.len);
280 cp = mtod(m, u_char *) + sizeof(struct ether_header);
286 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
289 * XXX if ns_thishost is the same as the node's ethernet
290 * address then just the default code will catch this anyhow.
291 * So I'm not sure if this next clause should be here at all?
294 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
295 m->m_pkthdr.rcvif = ifp;
296 netisr_dispatch(NETISR_NS, m);
299 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
300 m->m_flags |= M_BCAST;
303 case pseudo_AF_HDRCMPLT:
305 loop_copy = -1; /* if this is for us, don't do it */
306 deh = (struct ether_header *)dst->sa_data;
307 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
308 eh->ether_type = deh->ether_type;
312 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
313 gotoerr(EAFNOSUPPORT);
316 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
317 memcpy(eh->ether_shost,
318 ((struct ether_header *)dst->sa_data)->ether_shost,
321 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
324 * Bridges require special output handling.
326 if (ifp->if_bridge) {
327 KASSERT(bridge_output_p != NULL,
328 ("%s: if_bridge not loaded!", __func__));
329 lwkt_serialize_enter(ifp->if_serializer);
330 error = bridge_output_p(ifp, m, NULL, NULL);
331 lwkt_serialize_exit(ifp->if_serializer);
335 * If a simplex interface, and the packet is being sent to our
336 * Ethernet address or a broadcast address, loopback a copy.
337 * XXX To make a simplex device behave exactly like a duplex
338 * device, we should copy in the case of sending to our own
339 * ethernet address (thus letting the original actually appear
340 * on the wire). However, we don't do that here for security
341 * reasons and compatibility with the original behavior.
343 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
346 if (m->m_pkthdr.csum_flags & CSUM_IP)
347 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
348 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
349 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
350 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
353 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
354 n->m_pkthdr.csum_flags |= csum_flags;
355 if (csum_flags & CSUM_DATA_VALID)
356 n->m_pkthdr.csum_data = 0xffff;
357 if_simloop(ifp, n, dst->sa_family, hlen);
360 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
361 ETHER_ADDR_LEN) == 0) {
362 m->m_pkthdr.csum_flags |= csum_flags;
363 if (csum_flags & CSUM_DATA_VALID)
364 m->m_pkthdr.csum_data = 0xffff;
365 if_simloop(ifp, m, dst->sa_family, hlen);
366 return (0); /* XXX */
371 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
376 /* Handle ng_ether(4) processing, if any */
377 if (ng_ether_output_p != NULL) {
378 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
384 /* Continue with link-layer output */
385 return ether_output_frame(ifp, m);
393 * Ethernet link layer output routine to send a raw frame to the device.
395 * This assumes that the 14 byte Ethernet header is present and contiguous
399 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
401 struct ip_fw *rule = NULL;
403 struct altq_pktattr pktattr;
406 /* Extract info from dummynet tag */
407 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
409 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
411 m_tag_delete(m, mtag);
415 if (ifq_is_enabled(&ifp->if_snd))
416 altq_etherclassify(&ifp->if_snd, m, &pktattr);
418 if (IPFW_LOADED && ether_ipfw != 0) {
419 struct ether_header save_eh, *eh;
421 eh = mtod(m, struct ether_header *);
423 m_adj(m, ETHER_HDR_LEN);
424 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) {
428 return ENOBUFS; /* pkt dropped */
430 return 0; /* consumed e.g. in a pipe */
433 /* packet was ok, restore the ethernet header */
434 ether_restore_header(&m, eh, &save_eh);
443 * Queue message on interface, update output statistics if
444 * successful, and start output if interface not yet active.
446 error = ifq_dispatch(ifp, m, &pktattr);
451 * ipfw processing for ethernet packets (in and out).
452 * The second parameter is NULL from ether_demux(), and ifp from
453 * ether_output_frame().
456 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule,
457 const struct ether_header *eh)
459 struct ether_header save_eh = *eh; /* might be a ptr in m */
460 struct ip_fw_args args;
464 if (*rule != NULL && fw_one_pass)
465 return TRUE; /* dummynet packet, already partially processed */
468 * I need some amount of data to be contiguous.
470 i = min((*m0)->m_pkthdr.len, max_protohdr);
471 if ((*m0)->m_len < i) {
472 *m0 = m_pullup(*m0, i);
477 args.m = *m0; /* the packet we are looking at */
478 args.oif = dst; /* destination, if any */
479 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
480 m_tag_delete(*m0, mtag);
481 args.rule = *rule; /* matching rule to restart */
482 args.next_hop = NULL; /* we do not support forward yet */
483 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
484 i = ip_fw_chk_ptr(&args);
488 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
491 if (i == 0) /* a PASS rule. */
494 if (i & IP_FW_PORT_DYNT_FLAG) {
496 * Pass the pkt to dummynet, which consumes it.
500 m = *m0; /* pass the original to dummynet */
501 *m0 = NULL; /* and nothing back to the caller */
503 ether_restore_header(&m, eh, &save_eh);
507 ip_fw_dn_io_ptr(m, (i & 0xffff),
508 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
512 * XXX at some point add support for divert/forward actions.
513 * If none of the above matches, we have to drop the pkt.
519 * Process a received Ethernet packet.
521 * The ethernet header is assumed to be in the mbuf so the caller
522 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
523 * bytes in the first mbuf.
525 * This allows us to concentrate in one place a bunch of code which
526 * is replicated in all device drivers. Also, many functions called
527 * from ether_input() try to put the eh back into the mbuf, so we
528 * can later propagate the 'contiguous packet' interface to them.
530 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
531 * cluster, right before m_data. So be very careful when working on m,
532 * as you could destroy *eh !!
534 * First we perform any link layer operations, then continue to the
535 * upper layers with ether_demux().
538 ether_input_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
540 struct ether_header *eh;
542 ASSERT_SERIALIZED(ifp->if_serializer);
545 /* Discard packet if interface is not up */
546 if (!(ifp->if_flags & IFF_UP)) {
551 if (m->m_len < sizeof(struct ether_header)) {
552 /* XXX error in the caller. */
556 eh = mtod(m, struct ether_header *);
558 m->m_pkthdr.rcvif = ifp;
560 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
561 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
562 ifp->if_addrlen) == 0)
563 m->m_flags |= M_BCAST;
565 m->m_flags |= M_MCAST;
571 ifp->if_ibytes += m->m_pkthdr.len;
573 if (ifp->if_flags & IFF_MONITOR) {
575 * Interface marked for monitoring; discard packet.
582 * Tap the packet off here for a bridge. bridge_input()
583 * will return NULL if it has consumed the packet, otherwise
584 * it gets processed as normal. Note that bridge_input()
585 * will always return the original packet if we need to
586 * process it locally.
588 if (ifp->if_bridge) {
589 KASSERT(bridge_input_p != NULL,
590 ("%s: if_bridge not loaded!", __func__));
592 if(m->m_flags & M_PROTO1) {
593 m->m_flags &= ~M_PROTO1;
595 /* clear M_PROMISC, in case the packets comes from a vlan */
596 /* m->m_flags &= ~M_PROMISC; */
597 lwkt_serialize_exit(ifp->if_serializer);
598 m = (*bridge_input_p)(ifp, m);
599 lwkt_serialize_enter(ifp->if_serializer);
603 KASSERT(ifp == m->m_pkthdr.rcvif,
604 ("bridge_input_p changed rcvif\n"));
606 /* 'm' may be changed by bridge_input_p() */
607 eh = mtod(m, struct ether_header *);
611 /* Handle ng_ether(4) processing, if any */
612 if (ng_ether_input_p != NULL) {
613 ng_ether_input_p(ifp, &m);
617 /* 'm' may be changed by ng_ether_input_p() */
618 eh = mtod(m, struct ether_header *);
621 /* Continue with upper layer processing */
622 ether_demux_chain(ifp, m, chain);
626 ether_input(struct ifnet *ifp, struct mbuf *m)
628 ether_input_chain(ifp, m, NULL);
632 * Upper layer processing for a received Ethernet packet.
635 ether_demux_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
637 struct ether_header save_eh, *eh;
640 struct ip_fw *rule = NULL;
647 KASSERT(m->m_len >= ETHER_HDR_LEN,
648 ("ether header is no contiguous!\n"));
650 eh = mtod(m, struct ether_header *);
653 /* XXX old crufty stuff, needs to be removed */
654 m_adj(m, sizeof(struct ether_header));
656 /* Extract info from dummynet tag */
657 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
659 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
660 KKASSERT(ifp == NULL);
661 ifp = m->m_pkthdr.rcvif;
663 m_tag_delete(m, mtag);
666 if (rule) /* packet is passing the second time */
671 * XXX: Okay, we need to call carp_forus() and - if it is for
672 * us jump over code that does the normal check
673 * "ac_enaddr == ether_dhost". The check sequence is a bit
674 * different from OpenBSD, so we jump over as few code as
675 * possible, to catch _all_ sanity checks. This needs
676 * evaluation, to see if the carp ether_dhost values break any
679 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
684 * Discard packet if upper layers shouldn't see it because
685 * it was unicast to a different Ethernet address. If the
686 * driver is working properly, then this situation can only
687 * happen when the interface is in promiscuous mode.
689 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
690 (eh->ether_dhost[0] & 1) == 0 &&
691 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
697 if (IPFW_LOADED && ether_ipfw != 0) {
698 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) {
703 eh = NULL; /* catch any further usage */
705 ether_type = ntohs(save_eh.ether_type);
707 switch (ether_type) {
710 if (ipflow_fastforward(m, ifp->if_serializer))
716 if (ifp->if_flags & IFF_NOARP) {
717 /* Discard packet if ARP is disabled on interface */
733 if (ef_inputp && ef_inputp(ifp, &save_eh, m) == 0)
740 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
756 if (vlan_input_p != NULL) {
757 (*vlan_input_p)(&save_eh, m);
759 m->m_pkthdr.rcvif->if_noproto++;
766 if (ef_inputp && ef_inputp(ifp, &save_eh, m) == 0)
770 checksum = mtod(m, ushort *);
772 if ((ether_type <= ETHERMTU) &&
773 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
774 if (*checksum == 0xE0E0) {
775 m->m_pkthdr.len -= 3;
784 if (ether_type > ETHERMTU)
786 l = mtod(m, struct llc *);
787 if (l->llc_dsap == LLC_SNAP_LSAP &&
788 l->llc_ssap == LLC_SNAP_LSAP &&
789 l->llc_control == LLC_UI) {
790 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
791 sizeof at_org_code) == 0 &&
792 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
793 m_adj(m, sizeof(struct llc));
797 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
798 sizeof aarp_org_code) == 0 &&
799 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
800 m_adj(m, sizeof(struct llc));
807 if (ng_ether_input_orphan_p != NULL)
808 (*ng_ether_input_orphan_p)(ifp, m, &save_eh);
814 #ifdef ETHER_INPUT_CHAIN
816 struct mbuf_chain *c;
820 port = netisr_mport(isr, &m);
824 m->m_pkthdr.header = port; /* XXX */
825 cpuid = port->mpu_td->td_gd->gd_cpuid;
828 if (c->mc_head == NULL) {
829 c->mc_head = c->mc_tail = m;
831 c->mc_tail->m_nextpkt = m;
836 #endif /* ETHER_INPUT_CHAIN */
837 netisr_dispatch(isr, m);
841 ether_demux(struct ifnet *ifp, struct mbuf *m)
843 ether_demux_chain(ifp, m, NULL);
847 * Perform common duties while attaching to interface list
851 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
853 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
858 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
859 lwkt_serialize_t serializer)
861 struct sockaddr_dl *sdl;
863 ifp->if_type = IFT_ETHER;
864 ifp->if_addrlen = ETHER_ADDR_LEN;
865 ifp->if_hdrlen = ETHER_HDR_LEN;
866 if_attach(ifp, serializer);
867 ifp->if_mtu = ETHERMTU;
868 if (ifp->if_baudrate == 0)
869 ifp->if_baudrate = 10000000;
870 ifp->if_output = ether_output;
871 ifp->if_input = ether_input;
872 ifp->if_resolvemulti = ether_resolvemulti;
873 ifp->if_broadcastaddr = etherbroadcastaddr;
874 sdl = IF_LLSOCKADDR(ifp);
875 sdl->sdl_type = IFT_ETHER;
876 sdl->sdl_alen = ifp->if_addrlen;
877 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
879 * XXX Keep the current drivers happy.
880 * XXX Remove once all drivers have been cleaned up
882 if (lla != IFP2AC(ifp)->ac_enaddr)
883 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
884 bpfattach(ifp, dlt, hdrlen);
885 if (ng_ether_attach_p != NULL)
886 (*ng_ether_attach_p)(ifp);
888 if_printf(ifp, "MAC address: %6D\n", lla, ":");
892 * Perform common duties while detaching an Ethernet interface
895 ether_ifdetach(struct ifnet *ifp)
899 if (ng_ether_detach_p != NULL)
900 (*ng_ether_detach_p)(ifp);
906 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
908 struct ifaddr *ifa = (struct ifaddr *) data;
909 struct ifreq *ifr = (struct ifreq *) data;
912 #define IF_INIT(ifp) \
914 if (((ifp)->if_flags & IFF_UP) == 0) { \
915 (ifp)->if_flags |= IFF_UP; \
916 (ifp)->if_init((ifp)->if_softc); \
920 ASSERT_SERIALIZED(ifp->if_serializer);
924 switch (ifa->ifa_addr->sa_family) {
927 IF_INIT(ifp); /* before arpwhohas */
928 arp_ifinit(ifp, ifa);
933 * XXX - This code is probably wrong
937 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
938 struct arpcom *ac = IFP2AC(ifp);
940 if (ipx_nullhost(*ina))
941 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
943 bcopy(ina->x_host.c_host, ac->ac_enaddr,
944 sizeof ac->ac_enaddr);
946 IF_INIT(ifp); /* Set new address. */
952 * XXX - This code is probably wrong
956 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
957 struct arpcom *ac = IFP2AC(ifp);
959 if (ns_nullhost(*ina))
960 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
962 bcopy(ina->x_host.c_host, ac->ac_enaddr,
963 sizeof ac->ac_enaddr);
979 bcopy(IFP2AC(ifp)->ac_enaddr,
980 ((struct sockaddr *)ifr->ifr_data)->sa_data,
986 * Set the interface MTU.
988 if (ifr->ifr_mtu > ETHERMTU) {
991 ifp->if_mtu = ifr->ifr_mtu;
1006 struct sockaddr **llsa,
1007 struct sockaddr *sa)
1009 struct sockaddr_dl *sdl;
1010 struct sockaddr_in *sin;
1012 struct sockaddr_in6 *sin6;
1016 switch(sa->sa_family) {
1019 * No mapping needed. Just check that it's a valid MC address.
1021 sdl = (struct sockaddr_dl *)sa;
1022 e_addr = LLADDR(sdl);
1023 if ((e_addr[0] & 1) != 1)
1024 return EADDRNOTAVAIL;
1030 sin = (struct sockaddr_in *)sa;
1031 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1032 return EADDRNOTAVAIL;
1033 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1035 sdl->sdl_len = sizeof *sdl;
1036 sdl->sdl_family = AF_LINK;
1037 sdl->sdl_index = ifp->if_index;
1038 sdl->sdl_type = IFT_ETHER;
1039 sdl->sdl_alen = ETHER_ADDR_LEN;
1040 e_addr = LLADDR(sdl);
1041 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1042 *llsa = (struct sockaddr *)sdl;
1047 sin6 = (struct sockaddr_in6 *)sa;
1048 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1050 * An IP6 address of 0 means listen to all
1051 * of the Ethernet multicast address used for IP6.
1052 * (This is used for multicast routers.)
1054 ifp->if_flags |= IFF_ALLMULTI;
1058 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1059 return EADDRNOTAVAIL;
1060 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1062 sdl->sdl_len = sizeof *sdl;
1063 sdl->sdl_family = AF_LINK;
1064 sdl->sdl_index = ifp->if_index;
1065 sdl->sdl_type = IFT_ETHER;
1066 sdl->sdl_alen = ETHER_ADDR_LEN;
1067 e_addr = LLADDR(sdl);
1068 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1069 *llsa = (struct sockaddr *)sdl;
1075 * Well, the text isn't quite right, but it's the name
1078 return EAFNOSUPPORT;
1084 * This is for reference. We have a table-driven version
1085 * of the little-endian crc32 generator, which is faster
1086 * than the double-loop.
1089 ether_crc32_le(const uint8_t *buf, size_t len)
1091 uint32_t c, crc, carry;
1094 crc = 0xffffffffU; /* initial value */
1096 for (i = 0; i < len; i++) {
1098 for (j = 0; j < 8; j++) {
1099 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1103 crc = (crc ^ ETHER_CRC_POLY_LE);
1111 ether_crc32_le(const uint8_t *buf, size_t len)
1113 static const uint32_t crctab[] = {
1114 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1115 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1116 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1117 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1122 crc = 0xffffffffU; /* initial value */
1124 for (i = 0; i < len; i++) {
1126 crc = (crc >> 4) ^ crctab[crc & 0xf];
1127 crc = (crc >> 4) ^ crctab[crc & 0xf];
1135 ether_crc32_be(const uint8_t *buf, size_t len)
1137 uint32_t c, crc, carry;
1140 crc = 0xffffffffU; /* initial value */
1142 for (i = 0; i < len; i++) {
1144 for (j = 0; j < 8; j++) {
1145 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1149 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1157 * find the size of ethernet header, and call classifier
1160 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
1161 struct altq_pktattr *pktattr)
1163 struct ether_header *eh;
1164 uint16_t ether_type;
1165 int hlen, af, hdrsize;
1168 hlen = sizeof(struct ether_header);
1169 eh = mtod(m, struct ether_header *);
1171 ether_type = ntohs(eh->ether_type);
1172 if (ether_type < ETHERMTU) {
1174 struct llc *llc = (struct llc *)(eh + 1);
1177 if (m->m_len < hlen ||
1178 llc->llc_dsap != LLC_SNAP_LSAP ||
1179 llc->llc_ssap != LLC_SNAP_LSAP ||
1180 llc->llc_control != LLC_UI)
1181 goto bad; /* not snap! */
1183 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
1186 if (ether_type == ETHERTYPE_IP) {
1188 hdrsize = 20; /* sizeof(struct ip) */
1190 } else if (ether_type == ETHERTYPE_IPV6) {
1192 hdrsize = 40; /* sizeof(struct ip6_hdr) */
1197 while (m->m_len <= hlen) {
1201 hdr = m->m_data + hlen;
1202 if (m->m_len < hlen + hdrsize) {
1204 * ip header is not in a single mbuf. this should not
1205 * happen in the current code.
1206 * (todo: use m_pulldown in the future)
1212 ifq_classify(ifq, m, af, pktattr);
1219 pktattr->pattr_class = NULL;
1220 pktattr->pattr_hdr = NULL;
1221 pktattr->pattr_af = AF_UNSPEC;
1225 ether_restore_header(struct mbuf **m0, const struct ether_header *eh,
1226 const struct ether_header *save_eh)
1228 struct mbuf *m = *m0;
1230 ether_restore_hdr++;
1233 * Prepend the header, optimize for the common case of
1234 * eh pointing into the mbuf.
1236 if ((const void *)(eh + 1) == (void *)m->m_data) {
1237 m->m_data -= ETHER_HDR_LEN;
1238 m->m_len += ETHER_HDR_LEN;
1239 m->m_pkthdr.len += ETHER_HDR_LEN;
1241 ether_prepend_hdr++;
1243 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
1245 bcopy(save_eh, mtod(m, struct ether_header *),
1252 #ifdef ETHER_INPUT_CHAIN
1255 ether_input_ipifunc(void *arg)
1257 struct mbuf *m, *next;
1262 next = m->m_nextpkt;
1263 m->m_nextpkt = NULL;
1265 port = m->m_pkthdr.header;
1266 m->m_pkthdr.header = NULL;
1269 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg);
1272 } while (m != NULL);
1276 ether_input_dispatch(struct mbuf_chain *chain)
1281 for (i = 0; i < ncpus; ++i) {
1282 if (chain[i].mc_head != NULL) {
1283 lwkt_send_ipiq(globaldata_find(i),
1284 ether_input_ipifunc, chain[i].mc_head);
1288 ether_input_ipifunc(chain->mc_head);
1292 #endif /* ETHER_INPUT_CHAIN */