1 /*-
2 * Copyright (c) 1982, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
30 * $FreeBSD: releng/8.3/sys/net/if_ethersubr.c 231380 2012-02-10 13:15:11Z bz $
31 */
32
33 #include "opt_atalk.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36 #include "opt_ipx.h"
37 #include "opt_netgraph.h"
38 #include "opt_mbuf_profiling.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
46 #include <sys/mbuf.h>
47 #include <sys/random.h>
48 #include <sys/rwlock.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
51 #include <sys/sysctl.h>
52
53 #include <net/if.h>
54 #include <net/if_arp.h>
55 #include <net/netisr.h>
56 #include <net/route.h>
57 #include <net/if_llc.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
60 #include <net/bpf.h>
61 #include <net/ethernet.h>
62 #include <net/if_bridgevar.h>
63 #include <net/if_vlan_var.h>
64 #include <net/if_llatbl.h>
65 #include <net/pf_mtag.h>
66 #include <net/vnet.h>
67
68 #if defined(INET) || defined(INET6)
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/if_ether.h>
72 #include <netinet/ip_carp.h>
73 #include <netinet/ip_var.h>
74 #include <netinet/ip_fw.h>
75 #include <netinet/ipfw/ip_fw_private.h>
76 #endif
77 #ifdef INET6
78 #include <netinet6/nd6.h>
79 #endif
80
81 #ifdef IPX
82 #include <netipx/ipx.h>
83 #include <netipx/ipx_if.h>
84 #endif
85
86 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
87 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
88 struct sockaddr *dst, short *tp, int *hlen);
89
90 #ifdef NETATALK
91 #include <netatalk/at.h>
92 #include <netatalk/at_var.h>
93 #include <netatalk/at_extern.h>
94
95 #define llc_snap_org_code llc_un.type_snap.org_code
96 #define llc_snap_ether_type llc_un.type_snap.ether_type
97
98 extern u_char at_org_code[3];
99 extern u_char aarp_org_code[3];
100 #endif /* NETATALK */
101
102 #include <security/mac/mac_framework.h>
103
104 #ifdef CTASSERT
105 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
106 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
107 #endif
108
109 /* netgraph node hooks for ng_ether(4) */
110 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
111 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
112 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
113 void (*ng_ether_attach_p)(struct ifnet *ifp);
114 void (*ng_ether_detach_p)(struct ifnet *ifp);
115
116 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
117
118 /* if_bridge(4) support */
119 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
120 int (*bridge_output_p)(struct ifnet *, struct mbuf *,
121 struct sockaddr *, struct rtentry *);
122 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
123
124 /* if_lagg(4) support */
125 struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
126
127 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
128 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
129
130 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
131 struct sockaddr *);
132 #ifdef VIMAGE
133 static void ether_reassign(struct ifnet *, struct vnet *, char *);
134 #endif
135
136 /* XXX: should be in an arp support file, not here */
137 MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
138
139 #define ETHER_IS_BROADCAST(addr) \
140 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
141
142 #define senderr(e) do { error = (e); goto bad;} while (0)
143
144 #if defined(INET) || defined(INET6)
145 int
146 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, int shared);
147 static VNET_DEFINE(int, ether_ipfw);
148 #define V_ether_ipfw VNET(ether_ipfw)
149 #endif
150
151
152 /*
153 * Ethernet output routine.
154 * Encapsulate a packet of type family for the local net.
155 * Use trailer local net encapsulation if enough data in first
156 * packet leaves a multiple of 512 bytes of data in remainder.
157 */
158 int
159 ether_output(struct ifnet *ifp, struct mbuf *m,
160 struct sockaddr *dst, struct route *ro)
161 {
162 short type;
163 int error = 0, hdrcmplt = 0;
164 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
165 struct llentry *lle = NULL;
166 struct rtentry *rt0 = NULL;
167 struct ether_header *eh;
168 struct pf_mtag *t;
169 int loop_copy = 1;
170 int hlen; /* link layer header length */
171
172 if (ro != NULL) {
173 if (!(m->m_flags & (M_BCAST | M_MCAST)))
174 lle = ro->ro_lle;
175 rt0 = ro->ro_rt;
176 }
177 #ifdef MAC
178 error = mac_ifnet_check_transmit(ifp, m);
179 if (error)
180 senderr(error);
181 #endif
182
183 M_PROFILE(m);
184 if (ifp->if_flags & IFF_MONITOR)
185 senderr(ENETDOWN);
186 if (!((ifp->if_flags & IFF_UP) &&
187 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
188 senderr(ENETDOWN);
189
190 hlen = ETHER_HDR_LEN;
191 switch (dst->sa_family) {
192 #ifdef INET
193 case AF_INET:
194 if (lle != NULL && (lle->la_flags & LLE_VALID))
195 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
196 else
197 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
198 if (error)
199 return (error == EWOULDBLOCK ? 0 : error);
200 type = htons(ETHERTYPE_IP);
201 break;
202 case AF_ARP:
203 {
204 struct arphdr *ah;
205 ah = mtod(m, struct arphdr *);
206 ah->ar_hrd = htons(ARPHRD_ETHER);
207
208 loop_copy = 0; /* if this is for us, don't do it */
209
210 switch(ntohs(ah->ar_op)) {
211 case ARPOP_REVREQUEST:
212 case ARPOP_REVREPLY:
213 type = htons(ETHERTYPE_REVARP);
214 break;
215 case ARPOP_REQUEST:
216 case ARPOP_REPLY:
217 default:
218 type = htons(ETHERTYPE_ARP);
219 break;
220 }
221
222 if (m->m_flags & M_BCAST)
223 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
224 else
225 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
226
227 }
228 break;
229 #endif
230 #ifdef INET6
231 case AF_INET6:
232 if (lle != NULL && (lle->la_flags & LLE_VALID))
233 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
234 else
235 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
236 if (error)
237 return error;
238 type = htons(ETHERTYPE_IPV6);
239 break;
240 #endif
241 #ifdef IPX
242 case AF_IPX:
243 if (ef_outputp) {
244 error = ef_outputp(ifp, &m, dst, &type, &hlen);
245 if (error)
246 goto bad;
247 } else
248 type = htons(ETHERTYPE_IPX);
249 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
250 (caddr_t)edst, sizeof (edst));
251 break;
252 #endif
253 #ifdef NETATALK
254 case AF_APPLETALK:
255 {
256 struct at_ifaddr *aa;
257
258 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
259 senderr(EHOSTUNREACH); /* XXX */
260 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) {
261 ifa_free(&aa->aa_ifa);
262 return (0);
263 }
264 /*
265 * In the phase 2 case, need to prepend an mbuf for the llc header.
266 */
267 if ( aa->aa_flags & AFA_PHASE2 ) {
268 struct llc llc;
269
270 ifa_free(&aa->aa_ifa);
271 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
272 if (m == NULL)
273 senderr(ENOBUFS);
274 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
275 llc.llc_control = LLC_UI;
276 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
277 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
278 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
279 type = htons(m->m_pkthdr.len);
280 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
281 } else {
282 ifa_free(&aa->aa_ifa);
283 type = htons(ETHERTYPE_AT);
284 }
285 break;
286 }
287 #endif /* NETATALK */
288
289 case pseudo_AF_HDRCMPLT:
290 hdrcmplt = 1;
291 eh = (struct ether_header *)dst->sa_data;
292 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
293 /* FALLTHROUGH */
294
295 case AF_UNSPEC:
296 loop_copy = 0; /* if this is for us, don't do it */
297 eh = (struct ether_header *)dst->sa_data;
298 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
299 type = eh->ether_type;
300 break;
301
302 default:
303 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
304 senderr(EAFNOSUPPORT);
305 }
306
307 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
308 int csum_flags = 0;
309 if (m->m_pkthdr.csum_flags & CSUM_IP)
310 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
311 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
312 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
313 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
314 csum_flags |= CSUM_SCTP_VALID;
315 m->m_pkthdr.csum_flags |= csum_flags;
316 m->m_pkthdr.csum_data = 0xffff;
317 return (if_simloop(ifp, m, dst->sa_family, 0));
318 }
319
320 /*
321 * Add local net header. If no space in first mbuf,
322 * allocate another.
323 */
324 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
325 if (m == NULL)
326 senderr(ENOBUFS);
327 eh = mtod(m, struct ether_header *);
328 (void)memcpy(&eh->ether_type, &type,
329 sizeof(eh->ether_type));
330 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
331 if (hdrcmplt)
332 (void)memcpy(eh->ether_shost, esrc,
333 sizeof(eh->ether_shost));
334 else
335 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
336 sizeof(eh->ether_shost));
337
338 /*
339 * If a simplex interface, and the packet is being sent to our
340 * Ethernet address or a broadcast address, loopback a copy.
341 * XXX To make a simplex device behave exactly like a duplex
342 * device, we should copy in the case of sending to our own
343 * ethernet address (thus letting the original actually appear
344 * on the wire). However, we don't do that here for security
345 * reasons and compatibility with the original behavior.
346 */
347 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
348 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
349 int csum_flags = 0;
350
351 if (m->m_pkthdr.csum_flags & CSUM_IP)
352 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
353 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
354 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
355 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
356 csum_flags |= CSUM_SCTP_VALID;
357
358 if (m->m_flags & M_BCAST) {
359 struct mbuf *n;
360
361 /*
362 * Because if_simloop() modifies the packet, we need a
363 * writable copy through m_dup() instead of a readonly
364 * one as m_copy[m] would give us. The alternative would
365 * be to modify if_simloop() to handle the readonly mbuf,
366 * but performancewise it is mostly equivalent (trading
367 * extra data copying vs. extra locking).
368 *
369 * XXX This is a local workaround. A number of less
370 * often used kernel parts suffer from the same bug.
371 * See PR kern/105943 for a proposed general solution.
372 */
373 if ((n = m_dup(m, M_DONTWAIT)) != NULL) {
374 n->m_pkthdr.csum_flags |= csum_flags;
375 if (csum_flags & CSUM_DATA_VALID)
376 n->m_pkthdr.csum_data = 0xffff;
377 (void)if_simloop(ifp, n, dst->sa_family, hlen);
378 } else
379 ifp->if_iqdrops++;
380 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
381 ETHER_ADDR_LEN) == 0) {
382 m->m_pkthdr.csum_flags |= csum_flags;
383 if (csum_flags & CSUM_DATA_VALID)
384 m->m_pkthdr.csum_data = 0xffff;
385 (void) if_simloop(ifp, m, dst->sa_family, hlen);
386 return (0); /* XXX */
387 }
388 }
389
390 /*
391 * Bridges require special output handling.
392 */
393 if (ifp->if_bridge) {
394 BRIDGE_OUTPUT(ifp, m, error);
395 return (error);
396 }
397
398 #if defined(INET) || defined(INET6)
399 if (ifp->if_carp &&
400 (error = (*carp_output_p)(ifp, m, dst, NULL)))
401 goto bad;
402 #endif
403
404 /* Handle ng_ether(4) processing, if any */
405 if (IFP2AC(ifp)->ac_netgraph != NULL) {
406 KASSERT(ng_ether_output_p != NULL,
407 ("ng_ether_output_p is NULL"));
408 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
409 bad: if (m != NULL)
410 m_freem(m);
411 return (error);
412 }
413 if (m == NULL)
414 return (0);
415 }
416
417 /* Continue with link-layer output */
418 return ether_output_frame(ifp, m);
419 }
420
421 /*
422 * Ethernet link layer output routine to send a raw frame to the device.
423 *
424 * This assumes that the 14 byte Ethernet header is present and contiguous
425 * in the first mbuf (if BRIDGE'ing).
426 */
427 int
428 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
429 {
430 #if defined(INET) || defined(INET6)
431
432 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0) {
433 if (ether_ipfw_chk(&m, ifp, 0) == 0) {
434 if (m) {
435 m_freem(m);
436 return EACCES; /* pkt dropped */
437 } else
438 return 0; /* consumed e.g. in a pipe */
439 }
440 }
441 #endif
442
443 /*
444 * Queue message on interface, update output statistics if
445 * successful, and start output if interface not yet active.
446 */
447 return ((ifp->if_transmit)(ifp, m));
448 }
449
450 #if defined(INET) || defined(INET6)
451 /*
452 * ipfw processing for ethernet packets (in and out).
453 * The second parameter is NULL from ether_demux, and ifp from
454 * ether_output_frame.
455 */
456 int
457 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, int shared)
458 {
459 struct ether_header *eh;
460 struct ether_header save_eh;
461 struct mbuf *m;
462 int i;
463 struct ip_fw_args args;
464 struct m_tag *mtag;
465
466 /* fetch start point from rule, if any */
467 mtag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
468 if (mtag == NULL) {
469 args.rule.slot = 0;
470 } else {
471 /* dummynet packet, already partially processed */
472 struct ipfw_rule_ref *r;
473
474 /* XXX can we free it after use ? */
475 mtag->m_tag_id = PACKET_TAG_NONE;
476 r = (struct ipfw_rule_ref *)(mtag + 1);
477 if (r->info & IPFW_ONEPASS)
478 return (1);
479 args.rule = *r;
480 }
481
482 /*
483 * I need some amt of data to be contiguous, and in case others need
484 * the packet (shared==1) also better be in the first mbuf.
485 */
486 m = *m0;
487 i = min( m->m_pkthdr.len, max_protohdr);
488 if ( shared || m->m_len < i) {
489 m = m_pullup(m, i);
490 if (m == NULL) {
491 *m0 = m;
492 return 0;
493 }
494 }
495 eh = mtod(m, struct ether_header *);
496 save_eh = *eh; /* save copy for restore below */
497 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
498
499 args.m = m; /* the packet we are looking at */
500 args.oif = dst; /* destination, if any */
501 args.next_hop = NULL; /* we do not support forward yet */
502 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
503 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
504 i = V_ip_fw_chk_ptr(&args);
505 m = args.m;
506 if (m != NULL) {
507 /*
508 * Restore Ethernet header, as needed, in case the
509 * mbuf chain was replaced by ipfw.
510 */
511 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
512 if (m == NULL) {
513 *m0 = m;
514 return 0;
515 }
516 if (eh != mtod(m, struct ether_header *))
517 bcopy(&save_eh, mtod(m, struct ether_header *),
518 ETHER_HDR_LEN);
519 }
520 *m0 = m;
521
522 if (i == IP_FW_DENY) /* drop */
523 return 0;
524
525 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
526
527 if (i == IP_FW_PASS) /* a PASS rule. */
528 return 1;
529
530 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
531 int dir;
532 /*
533 * Pass the pkt to dummynet, which consumes it.
534 * If shared, make a copy and keep the original.
535 */
536 if (shared) {
537 m = m_copypacket(m, M_DONTWAIT);
538 if (m == NULL)
539 return 0;
540 } else {
541 /*
542 * Pass the original to dummynet and
543 * nothing back to the caller
544 */
545 *m0 = NULL ;
546 }
547 dir = PROTO_LAYER2 | (dst ? DIR_OUT : DIR_IN);
548 ip_dn_io_ptr(&m, dir, &args);
549 return 0;
550 }
551 /*
552 * XXX at some point add support for divert/forward actions.
553 * If none of the above matches, we have to drop the pkt.
554 */
555 return 0;
556 }
557 #endif
558
559 /*
560 * Process a received Ethernet packet; the packet is in the
561 * mbuf chain m with the ethernet header at the front.
562 */
563 static void
564 ether_input(struct ifnet *ifp, struct mbuf *m)
565 {
566 struct ether_header *eh;
567 u_short etype;
568
569 if ((ifp->if_flags & IFF_UP) == 0) {
570 m_freem(m);
571 return;
572 }
573 #ifdef DIAGNOSTIC
574 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
575 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
576 m_freem(m);
577 return;
578 }
579 #endif
580 /*
581 * Do consistency checks to verify assumptions
582 * made by code past this point.
583 */
584 if ((m->m_flags & M_PKTHDR) == 0) {
585 if_printf(ifp, "discard frame w/o packet header\n");
586 ifp->if_ierrors++;
587 m_freem(m);
588 return;
589 }
590 if (m->m_len < ETHER_HDR_LEN) {
591 /* XXX maybe should pullup? */
592 if_printf(ifp, "discard frame w/o leading ethernet "
593 "header (len %u pkt len %u)\n",
594 m->m_len, m->m_pkthdr.len);
595 ifp->if_ierrors++;
596 m_freem(m);
597 return;
598 }
599 eh = mtod(m, struct ether_header *);
600 etype = ntohs(eh->ether_type);
601 if (m->m_pkthdr.rcvif == NULL) {
602 if_printf(ifp, "discard frame w/o interface pointer\n");
603 ifp->if_ierrors++;
604 m_freem(m);
605 return;
606 }
607 #ifdef DIAGNOSTIC
608 if (m->m_pkthdr.rcvif != ifp) {
609 if_printf(ifp, "Warning, frame marked as received on %s\n",
610 m->m_pkthdr.rcvif->if_xname);
611 }
612 #endif
613
614 CURVNET_SET_QUIET(ifp->if_vnet);
615
616 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
617 if (ETHER_IS_BROADCAST(eh->ether_dhost))
618 m->m_flags |= M_BCAST;
619 else
620 m->m_flags |= M_MCAST;
621 ifp->if_imcasts++;
622 }
623
624 #ifdef MAC
625 /*
626 * Tag the mbuf with an appropriate MAC label before any other
627 * consumers can get to it.
628 */
629 mac_ifnet_create_mbuf(ifp, m);
630 #endif
631
632 /*
633 * Give bpf a chance at the packet.
634 */
635 ETHER_BPF_MTAP(ifp, m);
636
637 /*
638 * If the CRC is still on the packet, trim it off. We do this once
639 * and once only in case we are re-entered. Nothing else on the
640 * Ethernet receive path expects to see the FCS.
641 */
642 if (m->m_flags & M_HASFCS) {
643 m_adj(m, -ETHER_CRC_LEN);
644 m->m_flags &= ~M_HASFCS;
645 }
646
647 ifp->if_ibytes += m->m_pkthdr.len;
648
649 /* Allow monitor mode to claim this frame, after stats are updated. */
650 if (ifp->if_flags & IFF_MONITOR) {
651 m_freem(m);
652 CURVNET_RESTORE();
653 return;
654 }
655
656 /* Handle input from a lagg(4) port */
657 if (ifp->if_type == IFT_IEEE8023ADLAG) {
658 KASSERT(lagg_input_p != NULL,
659 ("%s: if_lagg not loaded!", __func__));
660 m = (*lagg_input_p)(ifp, m);
661 if (m != NULL)
662 ifp = m->m_pkthdr.rcvif;
663 else
664 return;
665 }
666
667 /*
668 * If the hardware did not process an 802.1Q tag, do this now,
669 * to allow 802.1P priority frames to be passed to the main input
670 * path correctly.
671 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
672 */
673 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
674 struct ether_vlan_header *evl;
675
676 if (m->m_len < sizeof(*evl) &&
677 (m = m_pullup(m, sizeof(*evl))) == NULL) {
678 #ifdef DIAGNOSTIC
679 if_printf(ifp, "cannot pullup VLAN header\n");
680 #endif
681 ifp->if_ierrors++;
682 m_freem(m);
683 return;
684 }
685
686 evl = mtod(m, struct ether_vlan_header *);
687 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
688 m->m_flags |= M_VLANTAG;
689
690 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
691 ETHER_HDR_LEN - ETHER_TYPE_LEN);
692 m_adj(m, ETHER_VLAN_ENCAP_LEN);
693 }
694
695 M_SETFIB(m, ifp->if_fib);
696
697 /* Allow ng_ether(4) to claim this frame. */
698 if (IFP2AC(ifp)->ac_netgraph != NULL) {
699 KASSERT(ng_ether_input_p != NULL,
700 ("%s: ng_ether_input_p is NULL", __func__));
701 m->m_flags &= ~M_PROMISC;
702 (*ng_ether_input_p)(ifp, &m);
703 if (m == NULL) {
704 CURVNET_RESTORE();
705 return;
706 }
707 }
708
709 /*
710 * Allow if_bridge(4) to claim this frame.
711 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
712 * and the frame should be delivered locally.
713 */
714 if (ifp->if_bridge != NULL) {
715 m->m_flags &= ~M_PROMISC;
716 BRIDGE_INPUT(ifp, m);
717 if (m == NULL) {
718 CURVNET_RESTORE();
719 return;
720 }
721 }
722
723 #if defined(INET) || defined(INET6)
724 /*
725 * Clear M_PROMISC on frame so that carp(4) will see it when the
726 * mbuf flows up to Layer 3.
727 * FreeBSD's implementation of carp(4) uses the inprotosw
728 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
729 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
730 * is outside the scope of the M_PROMISC test below.
731 * TODO: Maintain a hash table of ethernet addresses other than
732 * ether_dhost which may be active on this ifp.
733 */
734 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
735 m->m_flags &= ~M_PROMISC;
736 } else
737 #endif
738 {
739 /*
740 * If the frame received was not for our MAC address, set the
741 * M_PROMISC flag on the mbuf chain. The frame may need to
742 * be seen by the rest of the Ethernet input path in case of
743 * re-entry (e.g. bridge, vlan, netgraph) but should not be
744 * seen by upper protocol layers.
745 */
746 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
747 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
748 m->m_flags |= M_PROMISC;
749 }
750
751 /* First chunk of an mbuf contains good entropy */
752 if (harvest.ethernet)
753 random_harvest(m, 16, 3, 0, RANDOM_NET);
754
755 ether_demux(ifp, m);
756 CURVNET_RESTORE();
757 }
758
759 /*
760 * Upper layer processing for a received Ethernet packet.
761 */
762 void
763 ether_demux(struct ifnet *ifp, struct mbuf *m)
764 {
765 struct ether_header *eh;
766 int isr;
767 u_short ether_type;
768 #if defined(NETATALK)
769 struct llc *l;
770 #endif
771
772 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
773
774 #if defined(INET) || defined(INET6)
775 /*
776 * Allow dummynet and/or ipfw to claim the frame.
777 * Do not do this for PROMISC frames in case we are re-entered.
778 */
779 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0 && !(m->m_flags & M_PROMISC)) {
780 if (ether_ipfw_chk(&m, NULL, 0) == 0) {
781 if (m)
782 m_freem(m); /* dropped; free mbuf chain */
783 return; /* consumed */
784 }
785 }
786 #endif
787 eh = mtod(m, struct ether_header *);
788 ether_type = ntohs(eh->ether_type);
789
790 /*
791 * If this frame has a VLAN tag other than 0, call vlan_input()
792 * if its module is loaded. Otherwise, drop.
793 */
794 if ((m->m_flags & M_VLANTAG) &&
795 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
796 if (ifp->if_vlantrunk == NULL) {
797 ifp->if_noproto++;
798 m_freem(m);
799 return;
800 }
801 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
802 __func__));
803 /* Clear before possibly re-entering ether_input(). */
804 m->m_flags &= ~M_PROMISC;
805 (*vlan_input_p)(ifp, m);
806 return;
807 }
808
809 /*
810 * Pass promiscuously received frames to the upper layer if the user
811 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
812 */
813 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
814 m_freem(m);
815 return;
816 }
817
818 /*
819 * Reset layer specific mbuf flags to avoid confusing upper layers.
820 * Strip off Ethernet header.
821 */
822 m->m_flags &= ~M_VLANTAG;
823 m->m_flags &= ~(M_PROTOFLAGS);
824 m_adj(m, ETHER_HDR_LEN);
825
826 /*
827 * Dispatch frame to upper layer.
828 */
829 switch (ether_type) {
830 #ifdef INET
831 case ETHERTYPE_IP:
832 if ((m = ip_fastforward(m)) == NULL)
833 return;
834 isr = NETISR_IP;
835 break;
836
837 case ETHERTYPE_ARP:
838 if (ifp->if_flags & IFF_NOARP) {
839 /* Discard packet if ARP is disabled on interface */
840 m_freem(m);
841 return;
842 }
843 isr = NETISR_ARP;
844 break;
845 #endif
846 #ifdef IPX
847 case ETHERTYPE_IPX:
848 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
849 return;
850 isr = NETISR_IPX;
851 break;
852 #endif
853 #ifdef INET6
854 case ETHERTYPE_IPV6:
855 isr = NETISR_IPV6;
856 break;
857 #endif
858 #ifdef NETATALK
859 case ETHERTYPE_AT:
860 isr = NETISR_ATALK1;
861 break;
862 case ETHERTYPE_AARP:
863 isr = NETISR_AARP;
864 break;
865 #endif /* NETATALK */
866 default:
867 #ifdef IPX
868 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
869 return;
870 #endif /* IPX */
871 #if defined(NETATALK)
872 if (ether_type > ETHERMTU)
873 goto discard;
874 l = mtod(m, struct llc *);
875 if (l->llc_dsap == LLC_SNAP_LSAP &&
876 l->llc_ssap == LLC_SNAP_LSAP &&
877 l->llc_control == LLC_UI) {
878 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
879 sizeof(at_org_code)) == 0 &&
880 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
881 m_adj(m, LLC_SNAPFRAMELEN);
882 isr = NETISR_ATALK2;
883 break;
884 }
885 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
886 sizeof(aarp_org_code)) == 0 &&
887 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
888 m_adj(m, LLC_SNAPFRAMELEN);
889 isr = NETISR_AARP;
890 break;
891 }
892 }
893 #endif /* NETATALK */
894 goto discard;
895 }
896 netisr_dispatch(isr, m);
897 return;
898
899 discard:
900 /*
901 * Packet is to be discarded. If netgraph is present,
902 * hand the packet to it for last chance processing;
903 * otherwise dispose of it.
904 */
905 if (IFP2AC(ifp)->ac_netgraph != NULL) {
906 KASSERT(ng_ether_input_orphan_p != NULL,
907 ("ng_ether_input_orphan_p is NULL"));
908 /*
909 * Put back the ethernet header so netgraph has a
910 * consistent view of inbound packets.
911 */
912 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
913 (*ng_ether_input_orphan_p)(ifp, m);
914 return;
915 }
916 m_freem(m);
917 }
918
919 /*
920 * Convert Ethernet address to printable (loggable) representation.
921 * This routine is for compatibility; it's better to just use
922 *
923 * printf("%6D", <pointer to address>, ":");
924 *
925 * since there's no static buffer involved.
926 */
927 char *
928 ether_sprintf(const u_char *ap)
929 {
930 static char etherbuf[18];
931 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
932 return (etherbuf);
933 }
934
935 /*
936 * Perform common duties while attaching to interface list
937 */
938 void
939 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
940 {
941 int i;
942 struct ifaddr *ifa;
943 struct sockaddr_dl *sdl;
944
945 ifp->if_addrlen = ETHER_ADDR_LEN;
946 ifp->if_hdrlen = ETHER_HDR_LEN;
947 if_attach(ifp);
948 ifp->if_mtu = ETHERMTU;
949 ifp->if_output = ether_output;
950 ifp->if_input = ether_input;
951 ifp->if_resolvemulti = ether_resolvemulti;
952 #ifdef VIMAGE
953 ifp->if_reassign = ether_reassign;
954 #endif
955 if (ifp->if_baudrate == 0)
956 ifp->if_baudrate = IF_Mbps(10); /* just a default */
957 ifp->if_broadcastaddr = etherbroadcastaddr;
958
959 ifa = ifp->if_addr;
960 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
961 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
962 sdl->sdl_type = IFT_ETHER;
963 sdl->sdl_alen = ifp->if_addrlen;
964 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
965
966 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
967 if (ng_ether_attach_p != NULL)
968 (*ng_ether_attach_p)(ifp);
969
970 /* Announce Ethernet MAC address if non-zero. */
971 for (i = 0; i < ifp->if_addrlen; i++)
972 if (lla[i] != 0)
973 break;
974 if (i != ifp->if_addrlen)
975 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
976 }
977
978 /*
979 * Perform common duties while detaching an Ethernet interface
980 */
981 void
982 ether_ifdetach(struct ifnet *ifp)
983 {
984 if (IFP2AC(ifp)->ac_netgraph != NULL) {
985 KASSERT(ng_ether_detach_p != NULL,
986 ("ng_ether_detach_p is NULL"));
987 (*ng_ether_detach_p)(ifp);
988 }
989
990 bpfdetach(ifp);
991 if_detach(ifp);
992 }
993
994 #ifdef VIMAGE
995 void
996 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
997 {
998
999 if (IFP2AC(ifp)->ac_netgraph != NULL) {
1000 KASSERT(ng_ether_detach_p != NULL,
1001 ("ng_ether_detach_p is NULL"));
1002 (*ng_ether_detach_p)(ifp);
1003 }
1004
1005 if (ng_ether_attach_p != NULL) {
1006 CURVNET_SET_QUIET(new_vnet);
1007 (*ng_ether_attach_p)(ifp);
1008 CURVNET_RESTORE();
1009 }
1010 }
1011 #endif
1012
1013 SYSCTL_DECL(_net_link);
1014 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
1015 #if defined(INET) || defined(INET6)
1016 SYSCTL_VNET_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
1017 &VNET_NAME(ether_ipfw), 0, "Pass ether pkts through firewall");
1018 #endif
1019
1020 #if 0
1021 /*
1022 * This is for reference. We have a table-driven version
1023 * of the little-endian crc32 generator, which is faster
1024 * than the double-loop.
1025 */
1026 uint32_t
1027 ether_crc32_le(const uint8_t *buf, size_t len)
1028 {
1029 size_t i;
1030 uint32_t crc;
1031 int bit;
1032 uint8_t data;
1033
1034 crc = 0xffffffff; /* initial value */
1035
1036 for (i = 0; i < len; i++) {
1037 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1038 carry = (crc ^ data) & 1;
1039 crc >>= 1;
1040 if (carry)
1041 crc = (crc ^ ETHER_CRC_POLY_LE);
1042 }
1043 }
1044
1045 return (crc);
1046 }
1047 #else
1048 uint32_t
1049 ether_crc32_le(const uint8_t *buf, size_t len)
1050 {
1051 static const uint32_t crctab[] = {
1052 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1053 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1054 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1055 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1056 };
1057 size_t i;
1058 uint32_t crc;
1059
1060 crc = 0xffffffff; /* initial value */
1061
1062 for (i = 0; i < len; i++) {
1063 crc ^= buf[i];
1064 crc = (crc >> 4) ^ crctab[crc & 0xf];
1065 crc = (crc >> 4) ^ crctab[crc & 0xf];
1066 }
1067
1068 return (crc);
1069 }
1070 #endif
1071
1072 uint32_t
1073 ether_crc32_be(const uint8_t *buf, size_t len)
1074 {
1075 size_t i;
1076 uint32_t crc, carry;
1077 int bit;
1078 uint8_t data;
1079
1080 crc = 0xffffffff; /* initial value */
1081
1082 for (i = 0; i < len; i++) {
1083 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1084 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1085 crc <<= 1;
1086 if (carry)
1087 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1088 }
1089 }
1090
1091 return (crc);
1092 }
1093
1094 int
1095 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1096 {
1097 struct ifaddr *ifa = (struct ifaddr *) data;
1098 struct ifreq *ifr = (struct ifreq *) data;
1099 int error = 0;
1100
1101 switch (command) {
1102 case SIOCSIFADDR:
1103 ifp->if_flags |= IFF_UP;
1104
1105 switch (ifa->ifa_addr->sa_family) {
1106 #ifdef INET
1107 case AF_INET:
1108 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1109 arp_ifinit(ifp, ifa);
1110 break;
1111 #endif
1112 #ifdef IPX
1113 /*
1114 * XXX - This code is probably wrong
1115 */
1116 case AF_IPX:
1117 {
1118 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1119
1120 if (ipx_nullhost(*ina))
1121 ina->x_host =
1122 *(union ipx_host *)
1123 IF_LLADDR(ifp);
1124 else {
1125 bcopy((caddr_t) ina->x_host.c_host,
1126 (caddr_t) IF_LLADDR(ifp),
1127 ETHER_ADDR_LEN);
1128 }
1129
1130 /*
1131 * Set new address
1132 */
1133 ifp->if_init(ifp->if_softc);
1134 break;
1135 }
1136 #endif
1137 default:
1138 ifp->if_init(ifp->if_softc);
1139 break;
1140 }
1141 break;
1142
1143 case SIOCGIFADDR:
1144 {
1145 struct sockaddr *sa;
1146
1147 sa = (struct sockaddr *) & ifr->ifr_data;
1148 bcopy(IF_LLADDR(ifp),
1149 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1150 }
1151 break;
1152
1153 case SIOCSIFMTU:
1154 /*
1155 * Set the interface MTU.
1156 */
1157 if (ifr->ifr_mtu > ETHERMTU) {
1158 error = EINVAL;
1159 } else {
1160 ifp->if_mtu = ifr->ifr_mtu;
1161 }
1162 break;
1163 default:
1164 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1165 break;
1166 }
1167 return (error);
1168 }
1169
1170 static int
1171 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1172 struct sockaddr *sa)
1173 {
1174 struct sockaddr_dl *sdl;
1175 #ifdef INET
1176 struct sockaddr_in *sin;
1177 #endif
1178 #ifdef INET6
1179 struct sockaddr_in6 *sin6;
1180 #endif
1181 u_char *e_addr;
1182
1183 switch(sa->sa_family) {
1184 case AF_LINK:
1185 /*
1186 * No mapping needed. Just check that it's a valid MC address.
1187 */
1188 sdl = (struct sockaddr_dl *)sa;
1189 e_addr = LLADDR(sdl);
1190 if (!ETHER_IS_MULTICAST(e_addr))
1191 return EADDRNOTAVAIL;
1192 *llsa = 0;
1193 return 0;
1194
1195 #ifdef INET
1196 case AF_INET:
1197 sin = (struct sockaddr_in *)sa;
1198 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1199 return EADDRNOTAVAIL;
1200 sdl = malloc(sizeof *sdl, M_IFMADDR,
1201 M_NOWAIT|M_ZERO);
1202 if (sdl == NULL)
1203 return ENOMEM;
1204 sdl->sdl_len = sizeof *sdl;
1205 sdl->sdl_family = AF_LINK;
1206 sdl->sdl_index = ifp->if_index;
1207 sdl->sdl_type = IFT_ETHER;
1208 sdl->sdl_alen = ETHER_ADDR_LEN;
1209 e_addr = LLADDR(sdl);
1210 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1211 *llsa = (struct sockaddr *)sdl;
1212 return 0;
1213 #endif
1214 #ifdef INET6
1215 case AF_INET6:
1216 sin6 = (struct sockaddr_in6 *)sa;
1217 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1218 /*
1219 * An IP6 address of 0 means listen to all
1220 * of the Ethernet multicast address used for IP6.
1221 * (This is used for multicast routers.)
1222 */
1223 ifp->if_flags |= IFF_ALLMULTI;
1224 *llsa = 0;
1225 return 0;
1226 }
1227 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1228 return EADDRNOTAVAIL;
1229 sdl = malloc(sizeof *sdl, M_IFMADDR,
1230 M_NOWAIT|M_ZERO);
1231 if (sdl == NULL)
1232 return (ENOMEM);
1233 sdl->sdl_len = sizeof *sdl;
1234 sdl->sdl_family = AF_LINK;
1235 sdl->sdl_index = ifp->if_index;
1236 sdl->sdl_type = IFT_ETHER;
1237 sdl->sdl_alen = ETHER_ADDR_LEN;
1238 e_addr = LLADDR(sdl);
1239 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1240 *llsa = (struct sockaddr *)sdl;
1241 return 0;
1242 #endif
1243
1244 default:
1245 /*
1246 * Well, the text isn't quite right, but it's the name
1247 * that counts...
1248 */
1249 return EAFNOSUPPORT;
1250 }
1251 }
1252
1253 static void*
1254 ether_alloc(u_char type, struct ifnet *ifp)
1255 {
1256 struct arpcom *ac;
1257
1258 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1259 ac->ac_ifp = ifp;
1260
1261 return (ac);
1262 }
1263
1264 static void
1265 ether_free(void *com, u_char type)
1266 {
1267
1268 free(com, M_ARPCOM);
1269 }
1270
1271 static int
1272 ether_modevent(module_t mod, int type, void *data)
1273 {
1274
1275 switch (type) {
1276 case MOD_LOAD:
1277 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1278 break;
1279 case MOD_UNLOAD:
1280 if_deregister_com_alloc(IFT_ETHER);
1281 break;
1282 default:
1283 return EOPNOTSUPP;
1284 }
1285
1286 return (0);
1287 }
1288
1289 static moduledata_t ether_mod = {
1290 "ether",
1291 ether_modevent,
1292 0
1293 };
1294
1295 void
1296 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1297 {
1298 struct ether_vlan_header vlan;
1299 struct mbuf mv, mb;
1300
1301 KASSERT((m->m_flags & M_VLANTAG) != 0,
1302 ("%s: vlan information not present", __func__));
1303 KASSERT(m->m_len >= sizeof(struct ether_header),
1304 ("%s: mbuf not large enough for header", __func__));
1305 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1306 vlan.evl_proto = vlan.evl_encap_proto;
1307 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1308 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1309 m->m_len -= sizeof(struct ether_header);
1310 m->m_data += sizeof(struct ether_header);
1311 /*
1312 * If a data link has been supplied by the caller, then we will need to
1313 * re-create a stack allocated mbuf chain with the following structure:
1314 *
1315 * (1) mbuf #1 will contain the supplied data link
1316 * (2) mbuf #2 will contain the vlan header
1317 * (3) mbuf #3 will contain the original mbuf's packet data
1318 *
1319 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1320 */
1321 if (data != NULL) {
1322 mv.m_next = m;
1323 mv.m_data = (caddr_t)&vlan;
1324 mv.m_len = sizeof(vlan);
1325 mb.m_next = &mv;
1326 mb.m_data = data;
1327 mb.m_len = dlen;
1328 bpf_mtap(bp, &mb);
1329 } else
1330 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1331 m->m_len += sizeof(struct ether_header);
1332 m->m_data -= sizeof(struct ether_header);
1333 }
1334
1335 struct mbuf *
1336 ether_vlanencap(struct mbuf *m, uint16_t tag)
1337 {
1338 struct ether_vlan_header *evl;
1339
1340 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
1341 if (m == NULL)
1342 return (NULL);
1343 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1344
1345 if (m->m_len < sizeof(*evl)) {
1346 m = m_pullup(m, sizeof(*evl));
1347 if (m == NULL)
1348 return (NULL);
1349 }
1350
1351 /*
1352 * Transform the Ethernet header into an Ethernet header
1353 * with 802.1Q encapsulation.
1354 */
1355 evl = mtod(m, struct ether_vlan_header *);
1356 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1357 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1358 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1359 evl->evl_tag = htons(tag);
1360 return (m);
1361 }
1362
1363 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1364 MODULE_VERSION(ether, 1);
Cache object: e2f7aeea9513c279aeebe34f920710b6
|