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 1.57 2008/03/20 14:08:45 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
42 #include "opt_netgraph.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/sysctl.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>
60 #include <net/ifq_var.h>
62 #include <net/ethernet.h>
64 #if defined(INET) || defined(INET6)
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/if_ether.h>
68 #include <net/ipfw/ip_fw.h>
69 #include <net/dummynet/ip_dummynet.h>
72 #include <netinet6/nd6.h>
76 #include <netinet/ip_carp.h>
80 #include <netproto/ipx/ipx.h>
81 #include <netproto/ipx/ipx_if.h>
82 int (*ef_inputp
)(struct ifnet
*, const struct ether_header
*eh
, struct mbuf
*m
);
83 int (*ef_outputp
)(struct ifnet
*ifp
, struct mbuf
**mp
, struct sockaddr
*dst
,
84 short *tp
, int *hlen
);
89 #include <netns/ns_if.h>
91 int ether_outputdebug
= 0;
92 int ether_inputdebug
= 0;
96 #include <netproto/atalk/at.h>
97 #include <netproto/atalk/at_var.h>
98 #include <netproto/atalk/at_extern.h>
100 #define llc_snap_org_code llc_un.type_snap.org_code
101 #define llc_snap_ether_type llc_un.type_snap.ether_type
103 extern u_char at_org_code
[3];
104 extern u_char aarp_org_code
[3];
105 #endif /* NETATALK */
107 /* netgraph node hooks for ng_ether(4) */
108 void (*ng_ether_input_p
)(struct ifnet
*ifp
, struct mbuf
**mp
);
109 void (*ng_ether_input_orphan_p
)(struct ifnet
*ifp
,
110 struct mbuf
*m
, const struct ether_header
*eh
);
111 int (*ng_ether_output_p
)(struct ifnet
*ifp
, struct mbuf
**mp
);
112 void (*ng_ether_attach_p
)(struct ifnet
*ifp
);
113 void (*ng_ether_detach_p
)(struct ifnet
*ifp
);
115 int (*vlan_input_p
)(const struct ether_header
*eh
, struct mbuf
*m
);
116 int (*vlan_input_tag_p
)(struct mbuf
*m
, uint16_t t
);
118 static int ether_output(struct ifnet
*, struct mbuf
*, struct sockaddr
*,
120 static void ether_restore_header(struct mbuf
**, const struct ether_header
*,
121 const struct ether_header
*);
126 struct mbuf
*(*bridge_input_p
)(struct ifnet
*, struct mbuf
*);
127 int (*bridge_output_p
)(struct ifnet
*, struct mbuf
*,
128 struct sockaddr
*, struct rtentry
*);
129 void (*bridge_dn_p
)(struct mbuf
*, struct ifnet
*);
131 static int ether_resolvemulti(struct ifnet
*, struct sockaddr
**,
134 const uint8_t etherbroadcastaddr
[ETHER_ADDR_LEN
] = {
135 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
138 #define gotoerr(e) do { error = (e); goto bad; } while (0)
139 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
141 static boolean_t
ether_ipfw_chk(struct mbuf
**m0
, struct ifnet
*dst
,
143 const struct ether_header
*eh
);
145 static int ether_ipfw
;
146 static u_int ether_restore_hdr
;
147 static u_int ether_prepend_hdr
;
149 SYSCTL_DECL(_net_link
);
150 SYSCTL_NODE(_net_link
, IFT_ETHER
, ether
, CTLFLAG_RW
, 0, "Ethernet");
151 SYSCTL_INT(_net_link_ether
, OID_AUTO
, ipfw
, CTLFLAG_RW
,
152 ðer_ipfw
, 0, "Pass ether pkts through firewall");
153 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, restore_hdr
, CTLFLAG_RW
,
154 ðer_restore_hdr
, 0, "# of ether header restoration");
155 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, prepend_hdr
, CTLFLAG_RW
,
156 ðer_prepend_hdr
, 0,
157 "# of ether header restoration which prepends mbuf");
160 * Ethernet output routine.
161 * Encapsulate a packet of type family for the local net.
162 * Use trailer local net encapsulation if enough data in first
163 * packet leaves a multiple of 512 bytes of data in remainder.
164 * Assumes that ifp is actually pointer to arpcom structure.
167 ether_output(struct ifnet
*ifp
, struct mbuf
*m
, struct sockaddr
*dst
,
170 struct ether_header
*eh
, *deh
;
173 int hlen
= ETHER_HDR_LEN
; /* link layer header length */
174 struct arpcom
*ac
= IFP2AC(ifp
);
177 ASSERT_SERIALIZED(ifp
->if_serializer
);
179 if (ifp
->if_flags
& IFF_MONITOR
)
181 if ((ifp
->if_flags
& (IFF_UP
| IFF_RUNNING
)) != (IFF_UP
| IFF_RUNNING
))
184 M_PREPEND(m
, sizeof(struct ether_header
), MB_DONTWAIT
);
187 eh
= mtod(m
, struct ether_header
*);
188 edst
= eh
->ether_dhost
;
191 * Fill in the destination ethernet address and frame type.
193 switch (dst
->sa_family
) {
196 if (!arpresolve(ifp
, rt
, m
, dst
, edst
))
197 return (0); /* if not yet resolved */
198 eh
->ether_type
= htons(ETHERTYPE_IP
);
203 if (!nd6_storelladdr(&ac
->ac_if
, rt
, m
, dst
, edst
))
204 return (0); /* Something bad happenned. */
205 eh
->ether_type
= htons(ETHERTYPE_IPV6
);
210 if (ef_outputp
!= NULL
) {
211 error
= ef_outputp(ifp
, &m
, dst
, &eh
->ether_type
,
216 eh
->ether_type
= htons(ETHERTYPE_IPX
);
217 bcopy(&(((struct sockaddr_ipx
*)dst
)->sipx_addr
.x_host
),
218 edst
, ETHER_ADDR_LEN
);
224 struct at_ifaddr
*aa
;
226 if ((aa
= at_ifawithnet((struct sockaddr_at
*)dst
)) == NULL
) {
231 * In the phase 2 case, need to prepend an mbuf for
232 * the llc header. Since we must preserve the value
233 * of m, which is passed to us by value, we m_copy()
234 * the first mbuf, and use it for our llc header.
236 if (aa
->aa_flags
& AFA_PHASE2
) {
239 M_PREPEND(m
, sizeof(struct llc
), MB_DONTWAIT
);
240 eh
= mtod(m
, struct ether_header
*);
241 edst
= eh
->ether_dhost
;
242 llc
.llc_dsap
= llc
.llc_ssap
= LLC_SNAP_LSAP
;
243 llc
.llc_control
= LLC_UI
;
244 bcopy(at_org_code
, llc
.llc_snap_org_code
,
246 llc
.llc_snap_ether_type
= htons(ETHERTYPE_AT
);
248 mtod(m
, caddr_t
) + sizeof(struct ether_header
),
250 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
251 hlen
= sizeof(struct llc
) + ETHER_HDR_LEN
;
253 eh
->ether_type
= htons(ETHERTYPE_AT
);
255 if (!aarpresolve(ac
, m
, (struct sockaddr_at
*)dst
, edst
))
264 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
265 eh
->ether_type
= 0x8137;
267 case 0x0: /* Novell 802.3 */
268 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
270 case 0xe0e0: /* Novell 802.2 and Token-Ring */
271 M_PREPEND(m
, 3, MB_DONTWAIT
);
272 eh
= mtod(m
, struct ether_header
*);
273 edst
= eh
->ether_dhost
;
274 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
275 cp
= mtod(m
, u_char
*) + sizeof(struct ether_header
);
281 bcopy(&(((struct sockaddr_ns
*)dst
)->sns_addr
.x_host
), edst
,
284 * XXX if ns_thishost is the same as the node's ethernet
285 * address then just the default code will catch this anyhow.
286 * So I'm not sure if this next clause should be here at all?
289 if (bcmp(edst
, &ns_thishost
, ETHER_ADDR_LEN
) == 0) {
290 m
->m_pkthdr
.rcvif
= ifp
;
291 netisr_dispatch(NETISR_NS
, m
);
294 if (bcmp(edst
, &ns_broadhost
, ETHER_ADDR_LEN
) == 0)
295 m
->m_flags
|= M_BCAST
;
298 case pseudo_AF_HDRCMPLT
:
300 loop_copy
= -1; /* if this is for us, don't do it */
301 deh
= (struct ether_header
*)dst
->sa_data
;
302 memcpy(edst
, deh
->ether_dhost
, ETHER_ADDR_LEN
);
303 eh
->ether_type
= deh
->ether_type
;
307 if_printf(ifp
, "can't handle af%d\n", dst
->sa_family
);
308 gotoerr(EAFNOSUPPORT
);
311 if (dst
->sa_family
== pseudo_AF_HDRCMPLT
) /* unlikely */
312 memcpy(eh
->ether_shost
,
313 ((struct ether_header
*)dst
->sa_data
)->ether_shost
,
316 memcpy(eh
->ether_shost
, ac
->ac_enaddr
, ETHER_ADDR_LEN
);
319 * Bridges require special output handling.
321 if (ifp
->if_bridge
) {
322 KASSERT(bridge_output_p
!= NULL
,
323 ("%s: if_bridge not loaded!", __func__
));
324 return ((*bridge_output_p
)(ifp
, m
, NULL
, NULL
));
328 * If a simplex interface, and the packet is being sent to our
329 * Ethernet address or a broadcast address, loopback a copy.
330 * XXX To make a simplex device behave exactly like a duplex
331 * device, we should copy in the case of sending to our own
332 * ethernet address (thus letting the original actually appear
333 * on the wire). However, we don't do that here for security
334 * reasons and compatibility with the original behavior.
336 if ((ifp
->if_flags
& IFF_SIMPLEX
) && (loop_copy
!= -1)) {
339 if (m
->m_pkthdr
.csum_flags
& CSUM_IP
)
340 csum_flags
|= (CSUM_IP_CHECKED
| CSUM_IP_VALID
);
341 if (m
->m_pkthdr
.csum_flags
& CSUM_DELAY_DATA
)
342 csum_flags
|= (CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
343 if ((m
->m_flags
& M_BCAST
) || (loop_copy
> 0)) {
346 if ((n
= m_copypacket(m
, MB_DONTWAIT
)) != NULL
) {
347 n
->m_pkthdr
.csum_flags
|= csum_flags
;
348 if (csum_flags
& CSUM_DATA_VALID
)
349 n
->m_pkthdr
.csum_data
= 0xffff;
350 if_simloop(ifp
, n
, dst
->sa_family
, hlen
);
353 } else if (bcmp(eh
->ether_dhost
, eh
->ether_shost
,
354 ETHER_ADDR_LEN
) == 0) {
355 m
->m_pkthdr
.csum_flags
|= csum_flags
;
356 if (csum_flags
& CSUM_DATA_VALID
)
357 m
->m_pkthdr
.csum_data
= 0xffff;
358 if_simloop(ifp
, m
, dst
->sa_family
, hlen
);
359 return (0); /* XXX */
364 if (ifp
->if_carp
&& (error
= carp_output(ifp
, m
, dst
, NULL
)))
369 /* Handle ng_ether(4) processing, if any */
370 if (ng_ether_output_p
!= NULL
) {
371 if ((error
= (*ng_ether_output_p
)(ifp
, &m
)) != 0)
377 /* Continue with link-layer output */
378 return ether_output_frame(ifp
, m
);
386 * Ethernet link layer output routine to send a raw frame to the device.
388 * This assumes that the 14 byte Ethernet header is present and contiguous
392 ether_output_frame(struct ifnet
*ifp
, struct mbuf
*m
)
394 struct ip_fw
*rule
= NULL
;
396 struct altq_pktattr pktattr
;
399 ASSERT_SERIALIZED(ifp
->if_serializer
);
401 /* Extract info from dummynet tag */
402 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
404 rule
= ((struct dn_pkt
*)m_tag_data(mtag
))->dn_priv
;
406 m_tag_delete(m
, mtag
);
410 if (ifq_is_enabled(&ifp
->if_snd
))
411 altq_etherclassify(&ifp
->if_snd
, m
, &pktattr
);
413 if (IPFW_LOADED
&& ether_ipfw
!= 0) {
414 struct ether_header save_eh
, *eh
;
416 eh
= mtod(m
, struct ether_header
*);
418 m_adj(m
, ETHER_HDR_LEN
);
419 if (!ether_ipfw_chk(&m
, ifp
, &rule
, eh
)) {
423 return ENOBUFS
; /* pkt dropped */
425 return 0; /* consumed e.g. in a pipe */
428 /* packet was ok, restore the ethernet header */
429 ether_restore_header(&m
, eh
, &save_eh
);
438 * Queue message on interface, update output statistics if
439 * successful, and start output if interface not yet active.
441 error
= ifq_handoff(ifp
, m
, &pktattr
);
446 * ipfw processing for ethernet packets (in and out).
447 * The second parameter is NULL from ether_demux(), and ifp from
448 * ether_output_frame().
451 ether_ipfw_chk(struct mbuf
**m0
, struct ifnet
*dst
, struct ip_fw
**rule
,
452 const struct ether_header
*eh
)
454 struct ether_header save_eh
= *eh
; /* might be a ptr in m */
455 struct ip_fw_args args
;
459 if (*rule
!= NULL
&& fw_one_pass
)
460 return TRUE
; /* dummynet packet, already partially processed */
463 * I need some amount of data to be contiguous.
465 i
= min((*m0
)->m_pkthdr
.len
, max_protohdr
);
466 if ((*m0
)->m_len
< i
) {
467 *m0
= m_pullup(*m0
, i
);
472 args
.m
= *m0
; /* the packet we are looking at */
473 args
.oif
= dst
; /* destination, if any */
474 if ((mtag
= m_tag_find(*m0
, PACKET_TAG_IPFW_DIVERT
, NULL
)) != NULL
)
475 m_tag_delete(*m0
, mtag
);
476 args
.rule
= *rule
; /* matching rule to restart */
477 args
.next_hop
= NULL
; /* we do not support forward yet */
478 args
.eh
= &save_eh
; /* MAC header for bridged/MAC packets */
479 i
= ip_fw_chk_ptr(&args
);
483 if ((i
& IP_FW_PORT_DENY_FLAG
) || *m0
== NULL
) /* drop */
486 if (i
== 0) /* a PASS rule. */
489 if (i
& IP_FW_PORT_DYNT_FLAG
) {
491 * Pass the pkt to dummynet, which consumes it.
495 m
= *m0
; /* pass the original to dummynet */
496 *m0
= NULL
; /* and nothing back to the caller */
498 ether_restore_header(&m
, eh
, &save_eh
);
502 ip_fw_dn_io_ptr(m
, (i
& 0xffff),
503 dst
? DN_TO_ETH_OUT
: DN_TO_ETH_DEMUX
, &args
);
507 * XXX at some point add support for divert/forward actions.
508 * If none of the above matches, we have to drop the pkt.
514 * Process a received Ethernet packet.
516 * The ethernet header is assumed to be in the mbuf so the caller
517 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
518 * bytes in the first mbuf.
520 * This allows us to concentrate in one place a bunch of code which
521 * is replicated in all device drivers. Also, many functions called
522 * from ether_input() try to put the eh back into the mbuf, so we
523 * can later propagate the 'contiguous packet' interface to them.
525 * NOTA BENE: for all drivers "eh" is a pointer into the first mbuf or
526 * cluster, right before m_data. So be very careful when working on m,
527 * as you could destroy *eh !!
529 * First we perform any link layer operations, then continue to the
530 * upper layers with ether_demux().
533 ether_input(struct ifnet
*ifp
, struct mbuf
*m
)
535 struct ether_header
*eh
;
537 ASSERT_SERIALIZED(ifp
->if_serializer
);
540 /* Discard packet if interface is not up */
541 if (!(ifp
->if_flags
& IFF_UP
)) {
546 if (m
->m_len
< sizeof(struct ether_header
)) {
547 /* XXX error in the caller. */
551 eh
= mtod(m
, struct ether_header
*);
553 m
->m_pkthdr
.rcvif
= ifp
;
555 if (ETHER_IS_MULTICAST(eh
->ether_dhost
)) {
556 if (bcmp(ifp
->if_broadcastaddr
, eh
->ether_dhost
,
557 ifp
->if_addrlen
) == 0)
558 m
->m_flags
|= M_BCAST
;
560 m
->m_flags
|= M_MCAST
;
566 ifp
->if_ibytes
+= m
->m_pkthdr
.len
;
568 if (ifp
->if_flags
& IFF_MONITOR
) {
570 * Interface marked for monitoring; discard packet.
577 * Tap the packet off here for a bridge. bridge_input()
578 * will return NULL if it has consumed the packet, otherwise
579 * it gets processed as normal. Note that bridge_input()
580 * will always return the original packet if we need to
581 * process it locally.
583 if (ifp
->if_bridge
) {
584 KASSERT(bridge_input_p
!= NULL
,
585 ("%s: if_bridge not loaded!", __func__
));
587 if(m
->m_flags
& M_PROTO1
) {
588 m
->m_flags
&= ~M_PROTO1
;
590 /* clear M_PROMISC, in case the packets comes from a vlan */
591 /* m->m_flags &= ~M_PROMISC; */
592 lwkt_serialize_exit(ifp
->if_serializer
);
593 m
= (*bridge_input_p
)(ifp
, m
);
594 lwkt_serialize_enter(ifp
->if_serializer
);
598 KASSERT(ifp
== m
->m_pkthdr
.rcvif
,
599 ("bridge_input_p changed rcvif\n"));
601 /* 'm' may be changed by bridge_input_p() */
602 eh
= mtod(m
, struct ether_header
*);
606 /* Handle ng_ether(4) processing, if any */
607 if (ng_ether_input_p
!= NULL
) {
608 ng_ether_input_p(ifp
, &m
);
612 /* 'm' may be changed by ng_ether_input_p() */
613 eh
= mtod(m
, struct ether_header
*);
616 /* Continue with upper layer processing */
621 * Upper layer processing for a received Ethernet packet.
624 ether_demux(struct ifnet
*ifp
, struct mbuf
*m
)
626 struct ether_header save_eh
, *eh
;
629 struct ip_fw
*rule
= NULL
;
636 KASSERT(m
->m_len
>= ETHER_HDR_LEN
,
637 ("ether header is no contiguous!\n"));
639 eh
= mtod(m
, struct ether_header
*);
642 /* XXX old crufty stuff, needs to be removed */
643 m_adj(m
, sizeof(struct ether_header
));
645 /* Extract info from dummynet tag */
646 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
648 rule
= ((struct dn_pkt
*)m_tag_data(mtag
))->dn_priv
;
649 KKASSERT(ifp
== NULL
);
650 ifp
= m
->m_pkthdr
.rcvif
;
652 m_tag_delete(m
, mtag
);
655 if (rule
) /* packet is passing the second time */
660 * XXX: Okay, we need to call carp_forus() and - if it is for
661 * us jump over code that does the normal check
662 * "ac_enaddr == ether_dhost". The check sequence is a bit
663 * different from OpenBSD, so we jump over as few code as
664 * possible, to catch _all_ sanity checks. This needs
665 * evaluation, to see if the carp ether_dhost values break any
668 if (ifp
->if_carp
&& carp_forus(ifp
->if_carp
, eh
->ether_dhost
))
673 * Discard packet if upper layers shouldn't see it because
674 * it was unicast to a different Ethernet address. If the
675 * driver is working properly, then this situation can only
676 * happen when the interface is in promiscuous mode.
678 if (((ifp
->if_flags
& (IFF_PROMISC
| IFF_PPROMISC
)) == IFF_PROMISC
) &&
679 (eh
->ether_dhost
[0] & 1) == 0 &&
680 bcmp(eh
->ether_dhost
, IFP2AC(ifp
)->ac_enaddr
, ETHER_ADDR_LEN
)) {
686 if (IPFW_LOADED
&& ether_ipfw
!= 0) {
687 if (!ether_ipfw_chk(&m
, NULL
, &rule
, eh
)) {
692 eh
= NULL
; /* catch any further usage */
694 ether_type
= ntohs(save_eh
.ether_type
);
696 switch (ether_type
) {
699 if (ipflow_fastforward(m
, ifp
->if_serializer
))
705 if (ifp
->if_flags
& IFF_NOARP
) {
706 /* Discard packet if ARP is disabled on interface */
722 if (ef_inputp
&& ef_inputp(ifp
, &save_eh
, m
) == 0)
729 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
745 if (vlan_input_p
!= NULL
) {
746 (*vlan_input_p
)(&save_eh
, m
);
748 m
->m_pkthdr
.rcvif
->if_noproto
++;
755 if (ef_inputp
&& ef_inputp(ifp
, &save_eh
, m
) == 0)
759 checksum
= mtod(m
, ushort
*);
761 if ((ether_type
<= ETHERMTU
) &&
762 ((*checksum
== 0xffff) || (*checksum
== 0xE0E0))) {
763 if (*checksum
== 0xE0E0) {
764 m
->m_pkthdr
.len
-= 3;
773 if (ether_type
> ETHERMTU
)
775 l
= mtod(m
, struct llc
*);
776 if (l
->llc_dsap
== LLC_SNAP_LSAP
&&
777 l
->llc_ssap
== LLC_SNAP_LSAP
&&
778 l
->llc_control
== LLC_UI
) {
779 if (bcmp(&(l
->llc_snap_org_code
)[0], at_org_code
,
780 sizeof at_org_code
) == 0 &&
781 ntohs(l
->llc_snap_ether_type
) == ETHERTYPE_AT
) {
782 m_adj(m
, sizeof(struct llc
));
786 if (bcmp(&(l
->llc_snap_org_code
)[0], aarp_org_code
,
787 sizeof aarp_org_code
) == 0 &&
788 ntohs(l
->llc_snap_ether_type
) == ETHERTYPE_AARP
) {
789 m_adj(m
, sizeof(struct llc
));
796 if (ng_ether_input_orphan_p
!= NULL
)
797 (*ng_ether_input_orphan_p
)(ifp
, m
, &save_eh
);
802 netisr_dispatch(isr
, m
);
806 * Perform common duties while attaching to interface list
810 ether_ifattach(struct ifnet
*ifp
, uint8_t *lla
, lwkt_serialize_t serializer
)
812 ether_ifattach_bpf(ifp
, lla
, DLT_EN10MB
, sizeof(struct ether_header
),
817 ether_ifattach_bpf(struct ifnet
*ifp
, uint8_t *lla
, u_int dlt
, u_int hdrlen
,
818 lwkt_serialize_t serializer
)
820 struct sockaddr_dl
*sdl
;
822 ifp
->if_type
= IFT_ETHER
;
823 ifp
->if_addrlen
= ETHER_ADDR_LEN
;
824 ifp
->if_hdrlen
= ETHER_HDR_LEN
;
825 if_attach(ifp
, serializer
);
826 ifp
->if_mtu
= ETHERMTU
;
827 if (ifp
->if_baudrate
== 0)
828 ifp
->if_baudrate
= 10000000;
829 ifp
->if_output
= ether_output
;
830 ifp
->if_input
= ether_input
;
831 ifp
->if_resolvemulti
= ether_resolvemulti
;
832 ifp
->if_broadcastaddr
= etherbroadcastaddr
;
833 sdl
= IF_LLSOCKADDR(ifp
);
834 sdl
->sdl_type
= IFT_ETHER
;
835 sdl
->sdl_alen
= ifp
->if_addrlen
;
836 bcopy(lla
, LLADDR(sdl
), ifp
->if_addrlen
);
838 * XXX Keep the current drivers happy.
839 * XXX Remove once all drivers have been cleaned up
841 if (lla
!= IFP2AC(ifp
)->ac_enaddr
)
842 bcopy(lla
, IFP2AC(ifp
)->ac_enaddr
, ifp
->if_addrlen
);
843 bpfattach(ifp
, dlt
, hdrlen
);
844 if (ng_ether_attach_p
!= NULL
)
845 (*ng_ether_attach_p
)(ifp
);
847 if_printf(ifp
, "MAC address: %6D\n", lla
, ":");
851 * Perform common duties while detaching an Ethernet interface
854 ether_ifdetach(struct ifnet
*ifp
)
858 if (ng_ether_detach_p
!= NULL
)
859 (*ng_ether_detach_p
)(ifp
);
865 ether_ioctl(struct ifnet
*ifp
, int command
, caddr_t data
)
867 struct ifaddr
*ifa
= (struct ifaddr
*) data
;
868 struct ifreq
*ifr
= (struct ifreq
*) data
;
871 #define IF_INIT(ifp) \
873 if (((ifp)->if_flags & IFF_UP) == 0) { \
874 (ifp)->if_flags |= IFF_UP; \
875 (ifp)->if_init((ifp)->if_softc); \
879 ASSERT_SERIALIZED(ifp
->if_serializer
);
883 switch (ifa
->ifa_addr
->sa_family
) {
886 IF_INIT(ifp
); /* before arpwhohas */
887 arp_ifinit(ifp
, ifa
);
892 * XXX - This code is probably wrong
896 struct ipx_addr
*ina
= &IA_SIPX(ifa
)->sipx_addr
;
897 struct arpcom
*ac
= IFP2AC(ifp
);
899 if (ipx_nullhost(*ina
))
900 ina
->x_host
= *(union ipx_host
*) ac
->ac_enaddr
;
902 bcopy(ina
->x_host
.c_host
, ac
->ac_enaddr
,
903 sizeof ac
->ac_enaddr
);
905 IF_INIT(ifp
); /* Set new address. */
911 * XXX - This code is probably wrong
915 struct ns_addr
*ina
= &(IA_SNS(ifa
)->sns_addr
);
916 struct arpcom
*ac
= IFP2AC(ifp
);
918 if (ns_nullhost(*ina
))
919 ina
->x_host
= *(union ns_host
*)(ac
->ac_enaddr
);
921 bcopy(ina
->x_host
.c_host
, ac
->ac_enaddr
,
922 sizeof ac
->ac_enaddr
);
938 bcopy(IFP2AC(ifp
)->ac_enaddr
,
939 ((struct sockaddr
*)ifr
->ifr_data
)->sa_data
,
945 * Set the interface MTU.
947 if (ifr
->ifr_mtu
> ETHERMTU
) {
950 ifp
->if_mtu
= ifr
->ifr_mtu
;
965 struct sockaddr
**llsa
,
968 struct sockaddr_dl
*sdl
;
969 struct sockaddr_in
*sin
;
971 struct sockaddr_in6
*sin6
;
975 switch(sa
->sa_family
) {
978 * No mapping needed. Just check that it's a valid MC address.
980 sdl
= (struct sockaddr_dl
*)sa
;
981 e_addr
= LLADDR(sdl
);
982 if ((e_addr
[0] & 1) != 1)
983 return EADDRNOTAVAIL
;
989 sin
= (struct sockaddr_in
*)sa
;
990 if (!IN_MULTICAST(ntohl(sin
->sin_addr
.s_addr
)))
991 return EADDRNOTAVAIL
;
992 MALLOC(sdl
, struct sockaddr_dl
*, sizeof *sdl
, M_IFMADDR
,
994 sdl
->sdl_len
= sizeof *sdl
;
995 sdl
->sdl_family
= AF_LINK
;
996 sdl
->sdl_index
= ifp
->if_index
;
997 sdl
->sdl_type
= IFT_ETHER
;
998 sdl
->sdl_alen
= ETHER_ADDR_LEN
;
999 e_addr
= LLADDR(sdl
);
1000 ETHER_MAP_IP_MULTICAST(&sin
->sin_addr
, e_addr
);
1001 *llsa
= (struct sockaddr
*)sdl
;
1006 sin6
= (struct sockaddr_in6
*)sa
;
1007 if (IN6_IS_ADDR_UNSPECIFIED(&sin6
->sin6_addr
)) {
1009 * An IP6 address of 0 means listen to all
1010 * of the Ethernet multicast address used for IP6.
1011 * (This is used for multicast routers.)
1013 ifp
->if_flags
|= IFF_ALLMULTI
;
1017 if (!IN6_IS_ADDR_MULTICAST(&sin6
->sin6_addr
))
1018 return EADDRNOTAVAIL
;
1019 MALLOC(sdl
, struct sockaddr_dl
*, sizeof *sdl
, M_IFMADDR
,
1021 sdl
->sdl_len
= sizeof *sdl
;
1022 sdl
->sdl_family
= AF_LINK
;
1023 sdl
->sdl_index
= ifp
->if_index
;
1024 sdl
->sdl_type
= IFT_ETHER
;
1025 sdl
->sdl_alen
= ETHER_ADDR_LEN
;
1026 e_addr
= LLADDR(sdl
);
1027 ETHER_MAP_IPV6_MULTICAST(&sin6
->sin6_addr
, e_addr
);
1028 *llsa
= (struct sockaddr
*)sdl
;
1034 * Well, the text isn't quite right, but it's the name
1037 return EAFNOSUPPORT
;
1043 * This is for reference. We have a table-driven version
1044 * of the little-endian crc32 generator, which is faster
1045 * than the double-loop.
1048 ether_crc32_le(const uint8_t *buf
, size_t len
)
1050 uint32_t c
, crc
, carry
;
1053 crc
= 0xffffffffU
; /* initial value */
1055 for (i
= 0; i
< len
; i
++) {
1057 for (j
= 0; j
< 8; j
++) {
1058 carry
= ((crc
& 0x01) ? 1 : 0) ^ (c
& 0x01);
1062 crc
= (crc
^ ETHER_CRC_POLY_LE
);
1070 ether_crc32_le(const uint8_t *buf
, size_t len
)
1072 static const uint32_t crctab
[] = {
1073 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1074 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1075 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1076 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1081 crc
= 0xffffffffU
; /* initial value */
1083 for (i
= 0; i
< len
; i
++) {
1085 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
1086 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
1094 ether_crc32_be(const uint8_t *buf
, size_t len
)
1096 uint32_t c
, crc
, carry
;
1099 crc
= 0xffffffffU
; /* initial value */
1101 for (i
= 0; i
< len
; i
++) {
1103 for (j
= 0; j
< 8; j
++) {
1104 carry
= ((crc
& 0x80000000U
) ? 1 : 0) ^ (c
& 0x01);
1108 crc
= (crc
^ ETHER_CRC_POLY_BE
) | carry
;
1116 * find the size of ethernet header, and call classifier
1119 altq_etherclassify(struct ifaltq
*ifq
, struct mbuf
*m
,
1120 struct altq_pktattr
*pktattr
)
1122 struct ether_header
*eh
;
1123 uint16_t ether_type
;
1124 int hlen
, af
, hdrsize
;
1127 hlen
= sizeof(struct ether_header
);
1128 eh
= mtod(m
, struct ether_header
*);
1130 ether_type
= ntohs(eh
->ether_type
);
1131 if (ether_type
< ETHERMTU
) {
1133 struct llc
*llc
= (struct llc
*)(eh
+ 1);
1136 if (m
->m_len
< hlen
||
1137 llc
->llc_dsap
!= LLC_SNAP_LSAP
||
1138 llc
->llc_ssap
!= LLC_SNAP_LSAP
||
1139 llc
->llc_control
!= LLC_UI
)
1140 goto bad
; /* not snap! */
1142 ether_type
= ntohs(llc
->llc_un
.type_snap
.ether_type
);
1145 if (ether_type
== ETHERTYPE_IP
) {
1147 hdrsize
= 20; /* sizeof(struct ip) */
1149 } else if (ether_type
== ETHERTYPE_IPV6
) {
1151 hdrsize
= 40; /* sizeof(struct ip6_hdr) */
1156 while (m
->m_len
<= hlen
) {
1160 hdr
= m
->m_data
+ hlen
;
1161 if (m
->m_len
< hlen
+ hdrsize
) {
1163 * ip header is not in a single mbuf. this should not
1164 * happen in the current code.
1165 * (todo: use m_pulldown in the future)
1171 ifq_classify(ifq
, m
, af
, pktattr
);
1178 pktattr
->pattr_class
= NULL
;
1179 pktattr
->pattr_hdr
= NULL
;
1180 pktattr
->pattr_af
= AF_UNSPEC
;
1184 ether_restore_header(struct mbuf
**m0
, const struct ether_header
*eh
,
1185 const struct ether_header
*save_eh
)
1187 struct mbuf
*m
= *m0
;
1189 ether_restore_hdr
++;
1192 * Prepend the header, optimize for the common case of
1193 * eh pointing into the mbuf.
1195 if ((const void *)(eh
+ 1) == (void *)m
->m_data
) {
1196 m
->m_data
-= ETHER_HDR_LEN
;
1197 m
->m_len
+= ETHER_HDR_LEN
;
1198 m
->m_pkthdr
.len
+= ETHER_HDR_LEN
;
1200 ether_prepend_hdr
++;
1202 M_PREPEND(m
, ETHER_HDR_LEN
, MB_DONTWAIT
);
1204 bcopy(save_eh
, mtod(m
, struct ether_header
*),