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_mac.h"
38#include "opt_netgraph.h"
39#include "opt_carp.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/kernel.h>
44#include <sys/mac.h>
45#include <sys/malloc.h>
46#include <sys/module.h>
47#include <sys/mbuf.h>
48#include <sys/random.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
65#if defined(INET) || defined(INET6)
66#include <netinet/in.h>
67#include <netinet/in_var.h>
68#include <netinet/if_ether.h>
69#include <netinet/ip_fw.h>
70#include <netinet/ip_dummynet.h>
71#endif
72#ifdef INET6
73#include <netinet6/nd6.h>
74#endif
75
76#ifdef DEV_CARP
77#include <netinet/ip_carp.h>
78#endif
79
80#ifdef IPX
81#include <netipx/ipx.h>
82#include <netipx/ipx_if.h>
83#endif
84int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
85int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
86 struct sockaddr *dst, short *tp, int *hlen);
87
88#ifdef NETATALK
89#include <netatalk/at.h>
90#include <netatalk/at_var.h>
91#include <netatalk/at_extern.h>
92
93#define llc_snap_org_code llc_un.type_snap.org_code
94#define llc_snap_ether_type llc_un.type_snap.ether_type
95
96extern u_char at_org_code[3];
97extern u_char aarp_org_code[3];
98#endif /* NETATALK */
99
100/* netgraph node hooks for ng_ether(4) */
101void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
102void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
103int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
104void (*ng_ether_attach_p)(struct ifnet *ifp);
105void (*ng_ether_detach_p)(struct ifnet *ifp);
106
107void (*vlan_input_p)(struct ifnet *, struct mbuf *);
108
109/* if_bridge(4) support */
110struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
111int (*bridge_output_p)(struct ifnet *, struct mbuf *,
112 struct sockaddr *, struct rtentry *);
113void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
114
115static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
116 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
117
118static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
119 struct sockaddr *);
120
121/* XXX: should be in an arp support file, not here */
122MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
123
124#define senderr(e) do { error = (e); goto bad;} while (0)
125
126#if defined(INET) || defined(INET6)
127int
128ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
129 struct ip_fw **rule, int shared);
130static int ether_ipfw;
131#endif
132
133/*
134 * Ethernet output routine.
135 * Encapsulate a packet of type family for the local net.
136 * Use trailer local net encapsulation if enough data in first
137 * packet leaves a multiple of 512 bytes of data in remainder.
138 */
139int
140ether_output(struct ifnet *ifp, struct mbuf *m,
141 struct sockaddr *dst, struct rtentry *rt0)
142{
143 short type;
144 int error, hdrcmplt = 0;
145 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
146 struct ether_header *eh;
147 int loop_copy = 1;
148 int hlen; /* link layer header length */
149
150#ifdef MAC
151 error = mac_check_ifnet_transmit(ifp, m);
152 if (error)
153 senderr(error);
154#endif
155
156 if (ifp->if_flags & IFF_MONITOR)
157 senderr(ENETDOWN);
158 if (!((ifp->if_flags & IFF_UP) &&
159 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
160 senderr(ENETDOWN);
161
162 hlen = ETHER_HDR_LEN;
163 switch (dst->sa_family) {
164#ifdef INET
165 case AF_INET:
166 error = arpresolve(ifp, rt0, m, dst, edst);
167 if (error)
168 return (error == EWOULDBLOCK ? 0 : error);
169 type = htons(ETHERTYPE_IP);
170 break;
171 case AF_ARP:
172 {
173 struct arphdr *ah;
174 ah = mtod(m, struct arphdr *);
175 ah->ar_hrd = htons(ARPHRD_ETHER);
176
177 loop_copy = 0; /* if this is for us, don't do it */
178
179 switch(ntohs(ah->ar_op)) {
180 case ARPOP_REVREQUEST:
181 case ARPOP_REVREPLY:
182 type = htons(ETHERTYPE_REVARP);
183 break;
184 case ARPOP_REQUEST:
185 case ARPOP_REPLY:
186 default:
187 type = htons(ETHERTYPE_ARP);
188 break;
189 }
190
191 if (m->m_flags & M_BCAST)
192 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
193 else
194 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
195
196 }
197 break;
198#endif
199#ifdef INET6
200 case AF_INET6:
201 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst);
202 if (error)
203 return error;
204 type = htons(ETHERTYPE_IPV6);
205 break;
206#endif
207#ifdef IPX
208 case AF_IPX:
209 if (ef_outputp) {
210 error = ef_outputp(ifp, &m, dst, &type, &hlen);
211 if (error)
212 goto bad;
213 } else
214 type = htons(ETHERTYPE_IPX);
215 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
216 (caddr_t)edst, sizeof (edst));
217 break;
218#endif
219#ifdef NETATALK
220 case AF_APPLETALK:
221 {
222 struct at_ifaddr *aa;
223
224 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
225 senderr(EHOSTUNREACH); /* XXX */
226 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst))
227 return (0);
228 /*
229 * In the phase 2 case, need to prepend an mbuf for the llc header.
230 */
231 if ( aa->aa_flags & AFA_PHASE2 ) {
232 struct llc llc;
233
234 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
235 if (m == NULL)
236 senderr(ENOBUFS);
237 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
238 llc.llc_control = LLC_UI;
239 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
240 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
241 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
242 type = htons(m->m_pkthdr.len);
243 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
244 } else {
245 type = htons(ETHERTYPE_AT);
246 }
247 break;
248 }
249#endif /* NETATALK */
250
251 case pseudo_AF_HDRCMPLT:
252 hdrcmplt = 1;
253 eh = (struct ether_header *)dst->sa_data;
254 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
255 /* FALLTHROUGH */
256
257 case AF_UNSPEC:
258 loop_copy = 0; /* if this is for us, don't do it */
259 eh = (struct ether_header *)dst->sa_data;
260 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
261 type = eh->ether_type;
262 break;
263
264 default:
265 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
266 senderr(EAFNOSUPPORT);
267 }
268
269 /*
270 * Add local net header. If no space in first mbuf,
271 * allocate another.
272 */
273 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
274 if (m == NULL)
275 senderr(ENOBUFS);
276 eh = mtod(m, struct ether_header *);
277 (void)memcpy(&eh->ether_type, &type,
278 sizeof(eh->ether_type));
279 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
280 if (hdrcmplt)
281 (void)memcpy(eh->ether_shost, esrc,
282 sizeof(eh->ether_shost));
283 else
284 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
285 sizeof(eh->ether_shost));
286
287 /*
288 * Bridges require special output handling.
289 */
290 if (ifp->if_bridge) {
291 BRIDGE_OUTPUT(ifp, m, error);
292 return (error);
293 }
294
295 /*
296 * If a simplex interface, and the packet is being sent to our
297 * Ethernet address or a broadcast address, loopback a copy.
298 * XXX To make a simplex device behave exactly like a duplex
299 * device, we should copy in the case of sending to our own
300 * ethernet address (thus letting the original actually appear
301 * on the wire). However, we don't do that here for security
302 * reasons and compatibility with the original behavior.
303 */
304 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
305 m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) {
306 int csum_flags = 0;
307
308 if (m->m_pkthdr.csum_flags & CSUM_IP)
309 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
310 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
311 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
312
313 if (m->m_flags & M_BCAST) {
314 struct mbuf *n;
315
316 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
317 n->m_pkthdr.csum_flags |= csum_flags;
318 if (csum_flags & CSUM_DATA_VALID)
319 n->m_pkthdr.csum_data = 0xffff;
320 (void)if_simloop(ifp, n, dst->sa_family, hlen);
321 } else
322 ifp->if_iqdrops++;
323 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
324 ETHER_ADDR_LEN) == 0) {
325 m->m_pkthdr.csum_flags |= csum_flags;
326 if (csum_flags & CSUM_DATA_VALID)
327 m->m_pkthdr.csum_data = 0xffff;
328 (void) if_simloop(ifp, m, dst->sa_family, hlen);
329 return (0); /* XXX */
330 }
331 }
332
333#ifdef DEV_CARP
334 if (ifp->if_carp &&
335 (error = carp_output(ifp, m, dst, NULL)))
336 goto bad;
337#endif
338
339 /* Handle ng_ether(4) processing, if any */
340 if (IFP2AC(ifp)->ac_netgraph != NULL) {
341 KASSERT(ng_ether_output_p != NULL,
342 ("ng_ether_output_p is NULL"));
343 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
344bad: if (m != NULL)
345 m_freem(m);
346 return (error);
347 }
348 if (m == NULL)
349 return (0);
350 }
351
352 /* Continue with link-layer output */
353 return ether_output_frame(ifp, m);
354}
355
356/*
357 * Ethernet link layer output routine to send a raw frame to the device.
358 *
359 * This assumes that the 14 byte Ethernet header is present and contiguous
360 * in the first mbuf (if BRIDGE'ing).
361 */
362int
363ether_output_frame(struct ifnet *ifp, struct mbuf *m)
364{
365 int error;
366#if defined(INET) || defined(INET6)
367 struct ip_fw *rule = ip_dn_claim_rule(m);
368
369 if (IPFW_LOADED && ether_ipfw != 0) {
370 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) {
371 if (m) {
372 m_freem(m);
373 return EACCES; /* pkt dropped */
374 } else
375 return 0; /* consumed e.g. in a pipe */
376 }
377 }
378#endif
379
380 /*
381 * Queue message on interface, update output statistics if
382 * successful, and start output if interface not yet active.
383 */
384 IFQ_HANDOFF(ifp, m, error);
385 return (error);
386}
387
388#if defined(INET) || defined(INET6)
389/*
390 * ipfw processing for ethernet packets (in and out).
391 * The second parameter is NULL from ether_demux, and ifp from
392 * ether_output_frame.
393 */
394int
395ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
396 struct ip_fw **rule, int shared)
397{
398 struct ether_header *eh;
399 struct ether_header save_eh;
400 struct mbuf *m;
401 int i;
402 struct ip_fw_args args;
403
404 if (*rule != NULL && fw_one_pass)
405 return 1; /* dummynet packet, already partially processed */
406
407 /*
408 * I need some amt of data to be contiguous, and in case others need
409 * the packet (shared==1) also better be in the first mbuf.
410 */
411 m = *m0;
412 i = min( m->m_pkthdr.len, max_protohdr);
413 if ( shared || m->m_len < i) {
414 m = m_pullup(m, i);
415 if (m == NULL) {
416 *m0 = m;
417 return 0;
418 }
419 }
420 eh = mtod(m, struct ether_header *);
421 save_eh = *eh; /* save copy for restore below */
422 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
423
424 args.m = m; /* the packet we are looking at */
425 args.oif = dst; /* destination, if any */
426 args.rule = *rule; /* matching rule to restart */
427 args.next_hop = NULL; /* we do not support forward yet */
428 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
429 i = ip_fw_chk_ptr(&args);
430 m = args.m;
431 if (m != NULL) {
432 /*
433 * Restore Ethernet header, as needed, in case the
434 * mbuf chain was replaced by ipfw.
435 */
436 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
437 if (m == NULL) {
438 *m0 = m;
439 return 0;
440 }
441 if (eh != mtod(m, struct ether_header *))
442 bcopy(&save_eh, mtod(m, struct ether_header *),
443 ETHER_HDR_LEN);
444 }
445 *m0 = m;
446 *rule = args.rule;
447
448 if (i == IP_FW_DENY) /* drop */
449 return 0;
450
451 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
452
453 if (i == IP_FW_PASS) /* a PASS rule. */
454 return 1;
455
456 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
457 /*
458 * Pass the pkt to dummynet, which consumes it.
459 * If shared, make a copy and keep the original.
460 */
461 if (shared) {
462 m = m_copypacket(m, M_DONTWAIT);
463 if (m == NULL)
464 return 0;
465 } else {
466 /*
467 * Pass the original to dummynet and
468 * nothing back to the caller
469 */
470 *m0 = NULL ;
471 }
472 ip_dn_io_ptr(m, dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
473 return 0;
474 }
475 /*
476 * XXX at some point add support for divert/forward actions.
477 * If none of the above matches, we have to drop the pkt.
478 */
479 return 0;
480}
481#endif
482
483/*
484 * Process a received Ethernet packet; the packet is in the
485 * mbuf chain m with the ethernet header at the front.
486 */
487static void
488ether_input(struct ifnet *ifp, struct mbuf *m)
489{
490 struct ether_header *eh;
491 u_short etype;
492
493 /*
494 * Do consistency checks to verify assumptions
495 * made by code past this point.
496 */
497 if ((m->m_flags & M_PKTHDR) == 0) {
498 if_printf(ifp, "discard frame w/o packet header\n");
499 ifp->if_ierrors++;
500 m_freem(m);
501 return;
502 }
503 if (m->m_len < ETHER_HDR_LEN) {
504 /* XXX maybe should pullup? */
505 if_printf(ifp, "discard frame w/o leading ethernet "
506 "header (len %u pkt len %u)\n",
507 m->m_len, m->m_pkthdr.len);
508 ifp->if_ierrors++;
509 m_freem(m);
510 return;
511 }
512 eh = mtod(m, struct ether_header *);
513 etype = ntohs(eh->ether_type);
514 if (m->m_pkthdr.len >
515 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
516 if_printf(ifp, "discard oversize frame "
517 "(ether type %x flags %x len %u > max %lu)\n",
518 etype, m->m_flags, m->m_pkthdr.len,
519 ETHER_MAX_FRAME(ifp, etype,
520 m->m_flags & M_HASFCS));
521 ifp->if_ierrors++;
522 m_freem(m);
523 return;
524 }
525 if (m->m_pkthdr.rcvif == NULL) {
526 if_printf(ifp, "discard frame w/o interface pointer\n");
527 ifp->if_ierrors++;
528 m_freem(m);
529 return;
530 }
531#ifdef DIAGNOSTIC
532 if (m->m_pkthdr.rcvif != ifp) {
533 if_printf(ifp, "Warning, frame marked as received on %s\n",
534 m->m_pkthdr.rcvif->if_xname);
535 }
536#endif
537
538#ifdef MAC
539 /*
540 * Tag the mbuf with an appropriate MAC label before any other
541 * consumers can get to it.
542 */
543 mac_create_mbuf_from_ifnet(ifp, m);
544#endif
545
546 /*
547 * Give bpf a chance at the packet.
548 */
549 BPF_MTAP(ifp, m);
550
551 if (ifp->if_flags & IFF_MONITOR) {
552 /*
553 * Interface marked for monitoring; discard packet.
554 */
555 m_freem(m);
556 return;
557 }
558
559 /* If the CRC is still on the packet, trim it off. */
560 if (m->m_flags & M_HASFCS) {
561 m_adj(m, -ETHER_CRC_LEN);
562 m->m_flags &= ~M_HASFCS;
563 }
564
565 ifp->if_ibytes += m->m_pkthdr.len;
566
567 /* Handle ng_ether(4) processing, if any */
568 if (IFP2AC(ifp)->ac_netgraph != NULL) {
569 KASSERT(ng_ether_input_p != NULL,
570 ("ng_ether_input_p is NULL"));
571 (*ng_ether_input_p)(ifp, &m);
572 if (m == NULL)
573 return;
574 }
575
576 /*
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.
582 *
583 * XXX: When changing the below block, please also look
584 * at the src/sys/netgraph/ng_ether.c:ng_ether_rcv_upper()
585 */
586 if (ifp->if_bridge) {
587 BRIDGE_INPUT(ifp, m);
588 if (m == NULL)
589 return;
590 }
591
592 /* First chunk of an mbuf contains good entropy */
593 if (harvest.ethernet)
594 random_harvest(m, 16, 3, 0, RANDOM_NET);
595 ether_demux(ifp, m);
596}
597
598/*
599 * Upper layer processing for a received Ethernet packet.
600 */
601void
602ether_demux(struct ifnet *ifp, struct mbuf *m)
603{
604 struct ether_header *eh;
605 int isr;
606 u_short ether_type;
607#if defined(NETATALK)
608 struct llc *l;
609#endif
610#if defined(INET) || defined(INET6)
611 struct ip_fw *rule = ip_dn_claim_rule(m);
612#endif
613
614 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer"));
615
616 eh = mtod(m, struct ether_header *);
617 ether_type = ntohs(eh->ether_type);
618
619#if defined(INET) || defined(INET6)
620 if (rule) /* packet was already bridged */
621 goto post_stats;
622#endif
623
624 if (!(ifp->if_bridge) &&
625 !((ether_type == ETHERTYPE_VLAN || m->m_flags & M_VLANTAG) &&
| 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_mac.h"
38#include "opt_netgraph.h"
39#include "opt_carp.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/kernel.h>
44#include <sys/mac.h>
45#include <sys/malloc.h>
46#include <sys/module.h>
47#include <sys/mbuf.h>
48#include <sys/random.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
65#if defined(INET) || defined(INET6)
66#include <netinet/in.h>
67#include <netinet/in_var.h>
68#include <netinet/if_ether.h>
69#include <netinet/ip_fw.h>
70#include <netinet/ip_dummynet.h>
71#endif
72#ifdef INET6
73#include <netinet6/nd6.h>
74#endif
75
76#ifdef DEV_CARP
77#include <netinet/ip_carp.h>
78#endif
79
80#ifdef IPX
81#include <netipx/ipx.h>
82#include <netipx/ipx_if.h>
83#endif
84int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
85int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
86 struct sockaddr *dst, short *tp, int *hlen);
87
88#ifdef NETATALK
89#include <netatalk/at.h>
90#include <netatalk/at_var.h>
91#include <netatalk/at_extern.h>
92
93#define llc_snap_org_code llc_un.type_snap.org_code
94#define llc_snap_ether_type llc_un.type_snap.ether_type
95
96extern u_char at_org_code[3];
97extern u_char aarp_org_code[3];
98#endif /* NETATALK */
99
100/* netgraph node hooks for ng_ether(4) */
101void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
102void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
103int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
104void (*ng_ether_attach_p)(struct ifnet *ifp);
105void (*ng_ether_detach_p)(struct ifnet *ifp);
106
107void (*vlan_input_p)(struct ifnet *, struct mbuf *);
108
109/* if_bridge(4) support */
110struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
111int (*bridge_output_p)(struct ifnet *, struct mbuf *,
112 struct sockaddr *, struct rtentry *);
113void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
114
115static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
116 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
117
118static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
119 struct sockaddr *);
120
121/* XXX: should be in an arp support file, not here */
122MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
123
124#define senderr(e) do { error = (e); goto bad;} while (0)
125
126#if defined(INET) || defined(INET6)
127int
128ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
129 struct ip_fw **rule, int shared);
130static int ether_ipfw;
131#endif
132
133/*
134 * Ethernet output routine.
135 * Encapsulate a packet of type family for the local net.
136 * Use trailer local net encapsulation if enough data in first
137 * packet leaves a multiple of 512 bytes of data in remainder.
138 */
139int
140ether_output(struct ifnet *ifp, struct mbuf *m,
141 struct sockaddr *dst, struct rtentry *rt0)
142{
143 short type;
144 int error, hdrcmplt = 0;
145 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
146 struct ether_header *eh;
147 int loop_copy = 1;
148 int hlen; /* link layer header length */
149
150#ifdef MAC
151 error = mac_check_ifnet_transmit(ifp, m);
152 if (error)
153 senderr(error);
154#endif
155
156 if (ifp->if_flags & IFF_MONITOR)
157 senderr(ENETDOWN);
158 if (!((ifp->if_flags & IFF_UP) &&
159 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
160 senderr(ENETDOWN);
161
162 hlen = ETHER_HDR_LEN;
163 switch (dst->sa_family) {
164#ifdef INET
165 case AF_INET:
166 error = arpresolve(ifp, rt0, m, dst, edst);
167 if (error)
168 return (error == EWOULDBLOCK ? 0 : error);
169 type = htons(ETHERTYPE_IP);
170 break;
171 case AF_ARP:
172 {
173 struct arphdr *ah;
174 ah = mtod(m, struct arphdr *);
175 ah->ar_hrd = htons(ARPHRD_ETHER);
176
177 loop_copy = 0; /* if this is for us, don't do it */
178
179 switch(ntohs(ah->ar_op)) {
180 case ARPOP_REVREQUEST:
181 case ARPOP_REVREPLY:
182 type = htons(ETHERTYPE_REVARP);
183 break;
184 case ARPOP_REQUEST:
185 case ARPOP_REPLY:
186 default:
187 type = htons(ETHERTYPE_ARP);
188 break;
189 }
190
191 if (m->m_flags & M_BCAST)
192 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
193 else
194 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
195
196 }
197 break;
198#endif
199#ifdef INET6
200 case AF_INET6:
201 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst);
202 if (error)
203 return error;
204 type = htons(ETHERTYPE_IPV6);
205 break;
206#endif
207#ifdef IPX
208 case AF_IPX:
209 if (ef_outputp) {
210 error = ef_outputp(ifp, &m, dst, &type, &hlen);
211 if (error)
212 goto bad;
213 } else
214 type = htons(ETHERTYPE_IPX);
215 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
216 (caddr_t)edst, sizeof (edst));
217 break;
218#endif
219#ifdef NETATALK
220 case AF_APPLETALK:
221 {
222 struct at_ifaddr *aa;
223
224 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
225 senderr(EHOSTUNREACH); /* XXX */
226 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst))
227 return (0);
228 /*
229 * In the phase 2 case, need to prepend an mbuf for the llc header.
230 */
231 if ( aa->aa_flags & AFA_PHASE2 ) {
232 struct llc llc;
233
234 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
235 if (m == NULL)
236 senderr(ENOBUFS);
237 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
238 llc.llc_control = LLC_UI;
239 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
240 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
241 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
242 type = htons(m->m_pkthdr.len);
243 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
244 } else {
245 type = htons(ETHERTYPE_AT);
246 }
247 break;
248 }
249#endif /* NETATALK */
250
251 case pseudo_AF_HDRCMPLT:
252 hdrcmplt = 1;
253 eh = (struct ether_header *)dst->sa_data;
254 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
255 /* FALLTHROUGH */
256
257 case AF_UNSPEC:
258 loop_copy = 0; /* if this is for us, don't do it */
259 eh = (struct ether_header *)dst->sa_data;
260 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
261 type = eh->ether_type;
262 break;
263
264 default:
265 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
266 senderr(EAFNOSUPPORT);
267 }
268
269 /*
270 * Add local net header. If no space in first mbuf,
271 * allocate another.
272 */
273 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
274 if (m == NULL)
275 senderr(ENOBUFS);
276 eh = mtod(m, struct ether_header *);
277 (void)memcpy(&eh->ether_type, &type,
278 sizeof(eh->ether_type));
279 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
280 if (hdrcmplt)
281 (void)memcpy(eh->ether_shost, esrc,
282 sizeof(eh->ether_shost));
283 else
284 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
285 sizeof(eh->ether_shost));
286
287 /*
288 * Bridges require special output handling.
289 */
290 if (ifp->if_bridge) {
291 BRIDGE_OUTPUT(ifp, m, error);
292 return (error);
293 }
294
295 /*
296 * If a simplex interface, and the packet is being sent to our
297 * Ethernet address or a broadcast address, loopback a copy.
298 * XXX To make a simplex device behave exactly like a duplex
299 * device, we should copy in the case of sending to our own
300 * ethernet address (thus letting the original actually appear
301 * on the wire). However, we don't do that here for security
302 * reasons and compatibility with the original behavior.
303 */
304 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
305 m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) {
306 int csum_flags = 0;
307
308 if (m->m_pkthdr.csum_flags & CSUM_IP)
309 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
310 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
311 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
312
313 if (m->m_flags & M_BCAST) {
314 struct mbuf *n;
315
316 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
317 n->m_pkthdr.csum_flags |= csum_flags;
318 if (csum_flags & CSUM_DATA_VALID)
319 n->m_pkthdr.csum_data = 0xffff;
320 (void)if_simloop(ifp, n, dst->sa_family, hlen);
321 } else
322 ifp->if_iqdrops++;
323 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
324 ETHER_ADDR_LEN) == 0) {
325 m->m_pkthdr.csum_flags |= csum_flags;
326 if (csum_flags & CSUM_DATA_VALID)
327 m->m_pkthdr.csum_data = 0xffff;
328 (void) if_simloop(ifp, m, dst->sa_family, hlen);
329 return (0); /* XXX */
330 }
331 }
332
333#ifdef DEV_CARP
334 if (ifp->if_carp &&
335 (error = carp_output(ifp, m, dst, NULL)))
336 goto bad;
337#endif
338
339 /* Handle ng_ether(4) processing, if any */
340 if (IFP2AC(ifp)->ac_netgraph != NULL) {
341 KASSERT(ng_ether_output_p != NULL,
342 ("ng_ether_output_p is NULL"));
343 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
344bad: if (m != NULL)
345 m_freem(m);
346 return (error);
347 }
348 if (m == NULL)
349 return (0);
350 }
351
352 /* Continue with link-layer output */
353 return ether_output_frame(ifp, m);
354}
355
356/*
357 * Ethernet link layer output routine to send a raw frame to the device.
358 *
359 * This assumes that the 14 byte Ethernet header is present and contiguous
360 * in the first mbuf (if BRIDGE'ing).
361 */
362int
363ether_output_frame(struct ifnet *ifp, struct mbuf *m)
364{
365 int error;
366#if defined(INET) || defined(INET6)
367 struct ip_fw *rule = ip_dn_claim_rule(m);
368
369 if (IPFW_LOADED && ether_ipfw != 0) {
370 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) {
371 if (m) {
372 m_freem(m);
373 return EACCES; /* pkt dropped */
374 } else
375 return 0; /* consumed e.g. in a pipe */
376 }
377 }
378#endif
379
380 /*
381 * Queue message on interface, update output statistics if
382 * successful, and start output if interface not yet active.
383 */
384 IFQ_HANDOFF(ifp, m, error);
385 return (error);
386}
387
388#if defined(INET) || defined(INET6)
389/*
390 * ipfw processing for ethernet packets (in and out).
391 * The second parameter is NULL from ether_demux, and ifp from
392 * ether_output_frame.
393 */
394int
395ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
396 struct ip_fw **rule, int shared)
397{
398 struct ether_header *eh;
399 struct ether_header save_eh;
400 struct mbuf *m;
401 int i;
402 struct ip_fw_args args;
403
404 if (*rule != NULL && fw_one_pass)
405 return 1; /* dummynet packet, already partially processed */
406
407 /*
408 * I need some amt of data to be contiguous, and in case others need
409 * the packet (shared==1) also better be in the first mbuf.
410 */
411 m = *m0;
412 i = min( m->m_pkthdr.len, max_protohdr);
413 if ( shared || m->m_len < i) {
414 m = m_pullup(m, i);
415 if (m == NULL) {
416 *m0 = m;
417 return 0;
418 }
419 }
420 eh = mtod(m, struct ether_header *);
421 save_eh = *eh; /* save copy for restore below */
422 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
423
424 args.m = m; /* the packet we are looking at */
425 args.oif = dst; /* destination, if any */
426 args.rule = *rule; /* matching rule to restart */
427 args.next_hop = NULL; /* we do not support forward yet */
428 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
429 i = ip_fw_chk_ptr(&args);
430 m = args.m;
431 if (m != NULL) {
432 /*
433 * Restore Ethernet header, as needed, in case the
434 * mbuf chain was replaced by ipfw.
435 */
436 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
437 if (m == NULL) {
438 *m0 = m;
439 return 0;
440 }
441 if (eh != mtod(m, struct ether_header *))
442 bcopy(&save_eh, mtod(m, struct ether_header *),
443 ETHER_HDR_LEN);
444 }
445 *m0 = m;
446 *rule = args.rule;
447
448 if (i == IP_FW_DENY) /* drop */
449 return 0;
450
451 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
452
453 if (i == IP_FW_PASS) /* a PASS rule. */
454 return 1;
455
456 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
457 /*
458 * Pass the pkt to dummynet, which consumes it.
459 * If shared, make a copy and keep the original.
460 */
461 if (shared) {
462 m = m_copypacket(m, M_DONTWAIT);
463 if (m == NULL)
464 return 0;
465 } else {
466 /*
467 * Pass the original to dummynet and
468 * nothing back to the caller
469 */
470 *m0 = NULL ;
471 }
472 ip_dn_io_ptr(m, dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
473 return 0;
474 }
475 /*
476 * XXX at some point add support for divert/forward actions.
477 * If none of the above matches, we have to drop the pkt.
478 */
479 return 0;
480}
481#endif
482
483/*
484 * Process a received Ethernet packet; the packet is in the
485 * mbuf chain m with the ethernet header at the front.
486 */
487static void
488ether_input(struct ifnet *ifp, struct mbuf *m)
489{
490 struct ether_header *eh;
491 u_short etype;
492
493 /*
494 * Do consistency checks to verify assumptions
495 * made by code past this point.
496 */
497 if ((m->m_flags & M_PKTHDR) == 0) {
498 if_printf(ifp, "discard frame w/o packet header\n");
499 ifp->if_ierrors++;
500 m_freem(m);
501 return;
502 }
503 if (m->m_len < ETHER_HDR_LEN) {
504 /* XXX maybe should pullup? */
505 if_printf(ifp, "discard frame w/o leading ethernet "
506 "header (len %u pkt len %u)\n",
507 m->m_len, m->m_pkthdr.len);
508 ifp->if_ierrors++;
509 m_freem(m);
510 return;
511 }
512 eh = mtod(m, struct ether_header *);
513 etype = ntohs(eh->ether_type);
514 if (m->m_pkthdr.len >
515 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
516 if_printf(ifp, "discard oversize frame "
517 "(ether type %x flags %x len %u > max %lu)\n",
518 etype, m->m_flags, m->m_pkthdr.len,
519 ETHER_MAX_FRAME(ifp, etype,
520 m->m_flags & M_HASFCS));
521 ifp->if_ierrors++;
522 m_freem(m);
523 return;
524 }
525 if (m->m_pkthdr.rcvif == NULL) {
526 if_printf(ifp, "discard frame w/o interface pointer\n");
527 ifp->if_ierrors++;
528 m_freem(m);
529 return;
530 }
531#ifdef DIAGNOSTIC
532 if (m->m_pkthdr.rcvif != ifp) {
533 if_printf(ifp, "Warning, frame marked as received on %s\n",
534 m->m_pkthdr.rcvif->if_xname);
535 }
536#endif
537
538#ifdef MAC
539 /*
540 * Tag the mbuf with an appropriate MAC label before any other
541 * consumers can get to it.
542 */
543 mac_create_mbuf_from_ifnet(ifp, m);
544#endif
545
546 /*
547 * Give bpf a chance at the packet.
548 */
549 BPF_MTAP(ifp, m);
550
551 if (ifp->if_flags & IFF_MONITOR) {
552 /*
553 * Interface marked for monitoring; discard packet.
554 */
555 m_freem(m);
556 return;
557 }
558
559 /* If the CRC is still on the packet, trim it off. */
560 if (m->m_flags & M_HASFCS) {
561 m_adj(m, -ETHER_CRC_LEN);
562 m->m_flags &= ~M_HASFCS;
563 }
564
565 ifp->if_ibytes += m->m_pkthdr.len;
566
567 /* Handle ng_ether(4) processing, if any */
568 if (IFP2AC(ifp)->ac_netgraph != NULL) {
569 KASSERT(ng_ether_input_p != NULL,
570 ("ng_ether_input_p is NULL"));
571 (*ng_ether_input_p)(ifp, &m);
572 if (m == NULL)
573 return;
574 }
575
576 /*
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.
582 *
583 * XXX: When changing the below block, please also look
584 * at the src/sys/netgraph/ng_ether.c:ng_ether_rcv_upper()
585 */
586 if (ifp->if_bridge) {
587 BRIDGE_INPUT(ifp, m);
588 if (m == NULL)
589 return;
590 }
591
592 /* First chunk of an mbuf contains good entropy */
593 if (harvest.ethernet)
594 random_harvest(m, 16, 3, 0, RANDOM_NET);
595 ether_demux(ifp, m);
596}
597
598/*
599 * Upper layer processing for a received Ethernet packet.
600 */
601void
602ether_demux(struct ifnet *ifp, struct mbuf *m)
603{
604 struct ether_header *eh;
605 int isr;
606 u_short ether_type;
607#if defined(NETATALK)
608 struct llc *l;
609#endif
610#if defined(INET) || defined(INET6)
611 struct ip_fw *rule = ip_dn_claim_rule(m);
612#endif
613
614 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer"));
615
616 eh = mtod(m, struct ether_header *);
617 ether_type = ntohs(eh->ether_type);
618
619#if defined(INET) || defined(INET6)
620 if (rule) /* packet was already bridged */
621 goto post_stats;
622#endif
623
624 if (!(ifp->if_bridge) &&
625 !((ether_type == ETHERTYPE_VLAN || m->m_flags & M_VLANTAG) &&
|
720 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!"));
721 (*vlan_input_p)(ifp, m);
722 } else {
723 ifp->if_noproto++;
724 m_freem(m);
725 }
726 return;
727 }
728
729 /* Strip off Ethernet header. */
730 m_adj(m, ETHER_HDR_LEN);
731
732 /* If the CRC is still on the packet, trim it off. */
733 if (m->m_flags & M_HASFCS) {
734 m_adj(m, -ETHER_CRC_LEN);
735 m->m_flags &= ~M_HASFCS;
736 }
737
738 /* Reset layer specific mbuf flags to avoid confusing upper layers. */
739 m->m_flags &= ~(M_PROTOFLAGS);
740
741 switch (ether_type) {
742#ifdef INET
743 case ETHERTYPE_IP:
744 if ((m = ip_fastforward(m)) == NULL)
745 return;
746 isr = NETISR_IP;
747 break;
748
749 case ETHERTYPE_ARP:
750 if (ifp->if_flags & IFF_NOARP) {
751 /* Discard packet if ARP is disabled on interface */
752 m_freem(m);
753 return;
754 }
755 isr = NETISR_ARP;
756 break;
757#endif
758#ifdef IPX
759 case ETHERTYPE_IPX:
760 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
761 return;
762 isr = NETISR_IPX;
763 break;
764#endif
765#ifdef INET6
766 case ETHERTYPE_IPV6:
767 isr = NETISR_IPV6;
768 break;
769#endif
770#ifdef NETATALK
771 case ETHERTYPE_AT:
772 isr = NETISR_ATALK1;
773 break;
774 case ETHERTYPE_AARP:
775 isr = NETISR_AARP;
776 break;
777#endif /* NETATALK */
778 default:
779#ifdef IPX
780 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
781 return;
782#endif /* IPX */
783#if defined(NETATALK)
784 if (ether_type > ETHERMTU)
785 goto discard;
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, LLC_SNAPFRAMELEN);
794 isr = NETISR_ATALK2;
795 break;
796 }
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, LLC_SNAPFRAMELEN);
801 isr = NETISR_AARP;
802 break;
803 }
804 }
805#endif /* NETATALK */
806 goto discard;
807 }
808 netisr_dispatch(isr, m);
809 return;
810
811discard:
812 /*
813 * Packet is to be discarded. If netgraph is present,
814 * hand the packet to it for last chance processing;
815 * otherwise dispose of it.
816 */
817 if (IFP2AC(ifp)->ac_netgraph != NULL) {
818 KASSERT(ng_ether_input_orphan_p != NULL,
819 ("ng_ether_input_orphan_p is NULL"));
820 /*
821 * Put back the ethernet header so netgraph has a
822 * consistent view of inbound packets.
823 */
824 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
825 (*ng_ether_input_orphan_p)(ifp, m);
826 return;
827 }
828 m_freem(m);
829}
830
831/*
832 * Convert Ethernet address to printable (loggable) representation.
833 * This routine is for compatibility; it's better to just use
834 *
835 * printf("%6D", <pointer to address>, ":");
836 *
837 * since there's no static buffer involved.
838 */
839char *
840ether_sprintf(const u_char *ap)
841{
842 static char etherbuf[18];
843 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
844 return (etherbuf);
845}
846
847/*
848 * Perform common duties while attaching to interface list
849 */
850void
851ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
852{
853 int i;
854 struct ifaddr *ifa;
855 struct sockaddr_dl *sdl;
856
857 ifp->if_addrlen = ETHER_ADDR_LEN;
858 ifp->if_hdrlen = ETHER_HDR_LEN;
859 if_attach(ifp);
860 ifp->if_mtu = ETHERMTU;
861 ifp->if_output = ether_output;
862 ifp->if_input = ether_input;
863 ifp->if_resolvemulti = ether_resolvemulti;
864 if (ifp->if_baudrate == 0)
865 ifp->if_baudrate = IF_Mbps(10); /* just a default */
866 ifp->if_broadcastaddr = etherbroadcastaddr;
867
868 ifa = ifp->if_addr;
869 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
870 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
871 sdl->sdl_type = IFT_ETHER;
872 sdl->sdl_alen = ifp->if_addrlen;
873 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
874
875 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
876 if (ng_ether_attach_p != NULL)
877 (*ng_ether_attach_p)(ifp);
878
879 /* Announce Ethernet MAC address if non-zero. */
880 for (i = 0; i < ifp->if_addrlen; i++)
881 if (lla[i] != 0)
882 break;
883 if (i != ifp->if_addrlen)
884 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
885 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0)
886 if_printf(ifp, "if_start running deferred for Giant\n");
887}
888
889/*
890 * Perform common duties while detaching an Ethernet interface
891 */
892void
893ether_ifdetach(struct ifnet *ifp)
894{
895 if (IFP2AC(ifp)->ac_netgraph != NULL) {
896 KASSERT(ng_ether_detach_p != NULL,
897 ("ng_ether_detach_p is NULL"));
898 (*ng_ether_detach_p)(ifp);
899 }
900
901 bpfdetach(ifp);
902 if_detach(ifp);
903}
904
905SYSCTL_DECL(_net_link);
906SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
907#if defined(INET) || defined(INET6)
908SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
909 ðer_ipfw,0,"Pass ether pkts through firewall");
910#endif
911
912#if 0
913/*
914 * This is for reference. We have a table-driven version
915 * of the little-endian crc32 generator, which is faster
916 * than the double-loop.
917 */
918uint32_t
919ether_crc32_le(const uint8_t *buf, size_t len)
920{
921 size_t i;
922 uint32_t crc;
923 int bit;
924 uint8_t data;
925
926 crc = 0xffffffff; /* initial value */
927
928 for (i = 0; i < len; i++) {
929 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1)
930 carry = (crc ^ data) & 1;
931 crc >>= 1;
932 if (carry)
933 crc = (crc ^ ETHER_CRC_POLY_LE);
934 }
935
936 return (crc);
937}
938#else
939uint32_t
940ether_crc32_le(const uint8_t *buf, size_t len)
941{
942 static const uint32_t crctab[] = {
943 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
944 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
945 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
946 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
947 };
948 size_t i;
949 uint32_t crc;
950
951 crc = 0xffffffff; /* initial value */
952
953 for (i = 0; i < len; i++) {
954 crc ^= buf[i];
955 crc = (crc >> 4) ^ crctab[crc & 0xf];
956 crc = (crc >> 4) ^ crctab[crc & 0xf];
957 }
958
959 return (crc);
960}
961#endif
962
963uint32_t
964ether_crc32_be(const uint8_t *buf, size_t len)
965{
966 size_t i;
967 uint32_t crc, carry;
968 int bit;
969 uint8_t data;
970
971 crc = 0xffffffff; /* initial value */
972
973 for (i = 0; i < len; i++) {
974 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
975 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
976 crc <<= 1;
977 if (carry)
978 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
979 }
980 }
981
982 return (crc);
983}
984
985int
986ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
987{
988 struct ifaddr *ifa = (struct ifaddr *) data;
989 struct ifreq *ifr = (struct ifreq *) data;
990 int error = 0;
991
992 switch (command) {
993 case SIOCSIFADDR:
994 ifp->if_flags |= IFF_UP;
995
996 switch (ifa->ifa_addr->sa_family) {
997#ifdef INET
998 case AF_INET:
999 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1000 arp_ifinit(ifp, ifa);
1001 break;
1002#endif
1003#ifdef IPX
1004 /*
1005 * XXX - This code is probably wrong
1006 */
1007 case AF_IPX:
1008 {
1009 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1010
1011 if (ipx_nullhost(*ina))
1012 ina->x_host =
1013 *(union ipx_host *)
1014 IF_LLADDR(ifp);
1015 else {
1016 bcopy((caddr_t) ina->x_host.c_host,
1017 (caddr_t) IF_LLADDR(ifp),
1018 ETHER_ADDR_LEN);
1019 }
1020
1021 /*
1022 * Set new address
1023 */
1024 ifp->if_init(ifp->if_softc);
1025 break;
1026 }
1027#endif
1028 default:
1029 ifp->if_init(ifp->if_softc);
1030 break;
1031 }
1032 break;
1033
1034 case SIOCGIFADDR:
1035 {
1036 struct sockaddr *sa;
1037
1038 sa = (struct sockaddr *) & ifr->ifr_data;
1039 bcopy(IF_LLADDR(ifp),
1040 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1041 }
1042 break;
1043
1044 case SIOCSIFMTU:
1045 /*
1046 * Set the interface MTU.
1047 */
1048 if (ifr->ifr_mtu > ETHERMTU) {
1049 error = EINVAL;
1050 } else {
1051 ifp->if_mtu = ifr->ifr_mtu;
1052 }
1053 break;
1054 default:
1055 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1056 break;
1057 }
1058 return (error);
1059}
1060
1061static int
1062ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1063 struct sockaddr *sa)
1064{
1065 struct sockaddr_dl *sdl;
1066#ifdef INET
1067 struct sockaddr_in *sin;
1068#endif
1069#ifdef INET6
1070 struct sockaddr_in6 *sin6;
1071#endif
1072 u_char *e_addr;
1073
1074 switch(sa->sa_family) {
1075 case AF_LINK:
1076 /*
1077 * No mapping needed. Just check that it's a valid MC address.
1078 */
1079 sdl = (struct sockaddr_dl *)sa;
1080 e_addr = LLADDR(sdl);
1081 if (!ETHER_IS_MULTICAST(e_addr))
1082 return EADDRNOTAVAIL;
1083 *llsa = 0;
1084 return 0;
1085
1086#ifdef INET
1087 case AF_INET:
1088 sin = (struct sockaddr_in *)sa;
1089 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1090 return EADDRNOTAVAIL;
1091 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1092 M_NOWAIT|M_ZERO);
1093 if (sdl == NULL)
1094 return ENOMEM;
1095 sdl->sdl_len = sizeof *sdl;
1096 sdl->sdl_family = AF_LINK;
1097 sdl->sdl_index = ifp->if_index;
1098 sdl->sdl_type = IFT_ETHER;
1099 sdl->sdl_alen = ETHER_ADDR_LEN;
1100 e_addr = LLADDR(sdl);
1101 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1102 *llsa = (struct sockaddr *)sdl;
1103 return 0;
1104#endif
1105#ifdef INET6
1106 case AF_INET6:
1107 sin6 = (struct sockaddr_in6 *)sa;
1108 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1109 /*
1110 * An IP6 address of 0 means listen to all
1111 * of the Ethernet multicast address used for IP6.
1112 * (This is used for multicast routers.)
1113 */
1114 ifp->if_flags |= IFF_ALLMULTI;
1115 *llsa = 0;
1116 return 0;
1117 }
1118 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1119 return EADDRNOTAVAIL;
1120 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1121 M_NOWAIT|M_ZERO);
1122 if (sdl == NULL)
1123 return (ENOMEM);
1124 sdl->sdl_len = sizeof *sdl;
1125 sdl->sdl_family = AF_LINK;
1126 sdl->sdl_index = ifp->if_index;
1127 sdl->sdl_type = IFT_ETHER;
1128 sdl->sdl_alen = ETHER_ADDR_LEN;
1129 e_addr = LLADDR(sdl);
1130 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1131 *llsa = (struct sockaddr *)sdl;
1132 return 0;
1133#endif
1134
1135 default:
1136 /*
1137 * Well, the text isn't quite right, but it's the name
1138 * that counts...
1139 */
1140 return EAFNOSUPPORT;
1141 }
1142}
1143
1144static void*
1145ether_alloc(u_char type, struct ifnet *ifp)
1146{
1147 struct arpcom *ac;
1148
1149 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1150 ac->ac_ifp = ifp;
1151
1152 return (ac);
1153}
1154
1155static void
1156ether_free(void *com, u_char type)
1157{
1158
1159 free(com, M_ARPCOM);
1160}
1161
1162static int
1163ether_modevent(module_t mod, int type, void *data)
1164{
1165
1166 switch (type) {
1167 case MOD_LOAD:
1168 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1169 break;
1170 case MOD_UNLOAD:
1171 if_deregister_com_alloc(IFT_ETHER);
1172 break;
1173 default:
1174 return EOPNOTSUPP;
1175 }
1176
1177 return (0);
1178}
1179
1180static moduledata_t ether_mod = {
1181 "ether",
1182 ether_modevent,
1183 0
1184};
1185
1186DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1187MODULE_VERSION(ether, 1);
| 720 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!"));
721 (*vlan_input_p)(ifp, m);
722 } else {
723 ifp->if_noproto++;
724 m_freem(m);
725 }
726 return;
727 }
728
729 /* Strip off Ethernet header. */
730 m_adj(m, ETHER_HDR_LEN);
731
732 /* If the CRC is still on the packet, trim it off. */
733 if (m->m_flags & M_HASFCS) {
734 m_adj(m, -ETHER_CRC_LEN);
735 m->m_flags &= ~M_HASFCS;
736 }
737
738 /* Reset layer specific mbuf flags to avoid confusing upper layers. */
739 m->m_flags &= ~(M_PROTOFLAGS);
740
741 switch (ether_type) {
742#ifdef INET
743 case ETHERTYPE_IP:
744 if ((m = ip_fastforward(m)) == NULL)
745 return;
746 isr = NETISR_IP;
747 break;
748
749 case ETHERTYPE_ARP:
750 if (ifp->if_flags & IFF_NOARP) {
751 /* Discard packet if ARP is disabled on interface */
752 m_freem(m);
753 return;
754 }
755 isr = NETISR_ARP;
756 break;
757#endif
758#ifdef IPX
759 case ETHERTYPE_IPX:
760 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
761 return;
762 isr = NETISR_IPX;
763 break;
764#endif
765#ifdef INET6
766 case ETHERTYPE_IPV6:
767 isr = NETISR_IPV6;
768 break;
769#endif
770#ifdef NETATALK
771 case ETHERTYPE_AT:
772 isr = NETISR_ATALK1;
773 break;
774 case ETHERTYPE_AARP:
775 isr = NETISR_AARP;
776 break;
777#endif /* NETATALK */
778 default:
779#ifdef IPX
780 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
781 return;
782#endif /* IPX */
783#if defined(NETATALK)
784 if (ether_type > ETHERMTU)
785 goto discard;
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, LLC_SNAPFRAMELEN);
794 isr = NETISR_ATALK2;
795 break;
796 }
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, LLC_SNAPFRAMELEN);
801 isr = NETISR_AARP;
802 break;
803 }
804 }
805#endif /* NETATALK */
806 goto discard;
807 }
808 netisr_dispatch(isr, m);
809 return;
810
811discard:
812 /*
813 * Packet is to be discarded. If netgraph is present,
814 * hand the packet to it for last chance processing;
815 * otherwise dispose of it.
816 */
817 if (IFP2AC(ifp)->ac_netgraph != NULL) {
818 KASSERT(ng_ether_input_orphan_p != NULL,
819 ("ng_ether_input_orphan_p is NULL"));
820 /*
821 * Put back the ethernet header so netgraph has a
822 * consistent view of inbound packets.
823 */
824 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
825 (*ng_ether_input_orphan_p)(ifp, m);
826 return;
827 }
828 m_freem(m);
829}
830
831/*
832 * Convert Ethernet address to printable (loggable) representation.
833 * This routine is for compatibility; it's better to just use
834 *
835 * printf("%6D", <pointer to address>, ":");
836 *
837 * since there's no static buffer involved.
838 */
839char *
840ether_sprintf(const u_char *ap)
841{
842 static char etherbuf[18];
843 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
844 return (etherbuf);
845}
846
847/*
848 * Perform common duties while attaching to interface list
849 */
850void
851ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
852{
853 int i;
854 struct ifaddr *ifa;
855 struct sockaddr_dl *sdl;
856
857 ifp->if_addrlen = ETHER_ADDR_LEN;
858 ifp->if_hdrlen = ETHER_HDR_LEN;
859 if_attach(ifp);
860 ifp->if_mtu = ETHERMTU;
861 ifp->if_output = ether_output;
862 ifp->if_input = ether_input;
863 ifp->if_resolvemulti = ether_resolvemulti;
864 if (ifp->if_baudrate == 0)
865 ifp->if_baudrate = IF_Mbps(10); /* just a default */
866 ifp->if_broadcastaddr = etherbroadcastaddr;
867
868 ifa = ifp->if_addr;
869 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
870 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
871 sdl->sdl_type = IFT_ETHER;
872 sdl->sdl_alen = ifp->if_addrlen;
873 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
874
875 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
876 if (ng_ether_attach_p != NULL)
877 (*ng_ether_attach_p)(ifp);
878
879 /* Announce Ethernet MAC address if non-zero. */
880 for (i = 0; i < ifp->if_addrlen; i++)
881 if (lla[i] != 0)
882 break;
883 if (i != ifp->if_addrlen)
884 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
885 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0)
886 if_printf(ifp, "if_start running deferred for Giant\n");
887}
888
889/*
890 * Perform common duties while detaching an Ethernet interface
891 */
892void
893ether_ifdetach(struct ifnet *ifp)
894{
895 if (IFP2AC(ifp)->ac_netgraph != NULL) {
896 KASSERT(ng_ether_detach_p != NULL,
897 ("ng_ether_detach_p is NULL"));
898 (*ng_ether_detach_p)(ifp);
899 }
900
901 bpfdetach(ifp);
902 if_detach(ifp);
903}
904
905SYSCTL_DECL(_net_link);
906SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
907#if defined(INET) || defined(INET6)
908SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
909 ðer_ipfw,0,"Pass ether pkts through firewall");
910#endif
911
912#if 0
913/*
914 * This is for reference. We have a table-driven version
915 * of the little-endian crc32 generator, which is faster
916 * than the double-loop.
917 */
918uint32_t
919ether_crc32_le(const uint8_t *buf, size_t len)
920{
921 size_t i;
922 uint32_t crc;
923 int bit;
924 uint8_t data;
925
926 crc = 0xffffffff; /* initial value */
927
928 for (i = 0; i < len; i++) {
929 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1)
930 carry = (crc ^ data) & 1;
931 crc >>= 1;
932 if (carry)
933 crc = (crc ^ ETHER_CRC_POLY_LE);
934 }
935
936 return (crc);
937}
938#else
939uint32_t
940ether_crc32_le(const uint8_t *buf, size_t len)
941{
942 static const uint32_t crctab[] = {
943 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
944 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
945 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
946 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
947 };
948 size_t i;
949 uint32_t crc;
950
951 crc = 0xffffffff; /* initial value */
952
953 for (i = 0; i < len; i++) {
954 crc ^= buf[i];
955 crc = (crc >> 4) ^ crctab[crc & 0xf];
956 crc = (crc >> 4) ^ crctab[crc & 0xf];
957 }
958
959 return (crc);
960}
961#endif
962
963uint32_t
964ether_crc32_be(const uint8_t *buf, size_t len)
965{
966 size_t i;
967 uint32_t crc, carry;
968 int bit;
969 uint8_t data;
970
971 crc = 0xffffffff; /* initial value */
972
973 for (i = 0; i < len; i++) {
974 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
975 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
976 crc <<= 1;
977 if (carry)
978 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
979 }
980 }
981
982 return (crc);
983}
984
985int
986ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
987{
988 struct ifaddr *ifa = (struct ifaddr *) data;
989 struct ifreq *ifr = (struct ifreq *) data;
990 int error = 0;
991
992 switch (command) {
993 case SIOCSIFADDR:
994 ifp->if_flags |= IFF_UP;
995
996 switch (ifa->ifa_addr->sa_family) {
997#ifdef INET
998 case AF_INET:
999 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1000 arp_ifinit(ifp, ifa);
1001 break;
1002#endif
1003#ifdef IPX
1004 /*
1005 * XXX - This code is probably wrong
1006 */
1007 case AF_IPX:
1008 {
1009 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1010
1011 if (ipx_nullhost(*ina))
1012 ina->x_host =
1013 *(union ipx_host *)
1014 IF_LLADDR(ifp);
1015 else {
1016 bcopy((caddr_t) ina->x_host.c_host,
1017 (caddr_t) IF_LLADDR(ifp),
1018 ETHER_ADDR_LEN);
1019 }
1020
1021 /*
1022 * Set new address
1023 */
1024 ifp->if_init(ifp->if_softc);
1025 break;
1026 }
1027#endif
1028 default:
1029 ifp->if_init(ifp->if_softc);
1030 break;
1031 }
1032 break;
1033
1034 case SIOCGIFADDR:
1035 {
1036 struct sockaddr *sa;
1037
1038 sa = (struct sockaddr *) & ifr->ifr_data;
1039 bcopy(IF_LLADDR(ifp),
1040 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1041 }
1042 break;
1043
1044 case SIOCSIFMTU:
1045 /*
1046 * Set the interface MTU.
1047 */
1048 if (ifr->ifr_mtu > ETHERMTU) {
1049 error = EINVAL;
1050 } else {
1051 ifp->if_mtu = ifr->ifr_mtu;
1052 }
1053 break;
1054 default:
1055 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1056 break;
1057 }
1058 return (error);
1059}
1060
1061static int
1062ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1063 struct sockaddr *sa)
1064{
1065 struct sockaddr_dl *sdl;
1066#ifdef INET
1067 struct sockaddr_in *sin;
1068#endif
1069#ifdef INET6
1070 struct sockaddr_in6 *sin6;
1071#endif
1072 u_char *e_addr;
1073
1074 switch(sa->sa_family) {
1075 case AF_LINK:
1076 /*
1077 * No mapping needed. Just check that it's a valid MC address.
1078 */
1079 sdl = (struct sockaddr_dl *)sa;
1080 e_addr = LLADDR(sdl);
1081 if (!ETHER_IS_MULTICAST(e_addr))
1082 return EADDRNOTAVAIL;
1083 *llsa = 0;
1084 return 0;
1085
1086#ifdef INET
1087 case AF_INET:
1088 sin = (struct sockaddr_in *)sa;
1089 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1090 return EADDRNOTAVAIL;
1091 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1092 M_NOWAIT|M_ZERO);
1093 if (sdl == NULL)
1094 return ENOMEM;
1095 sdl->sdl_len = sizeof *sdl;
1096 sdl->sdl_family = AF_LINK;
1097 sdl->sdl_index = ifp->if_index;
1098 sdl->sdl_type = IFT_ETHER;
1099 sdl->sdl_alen = ETHER_ADDR_LEN;
1100 e_addr = LLADDR(sdl);
1101 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1102 *llsa = (struct sockaddr *)sdl;
1103 return 0;
1104#endif
1105#ifdef INET6
1106 case AF_INET6:
1107 sin6 = (struct sockaddr_in6 *)sa;
1108 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1109 /*
1110 * An IP6 address of 0 means listen to all
1111 * of the Ethernet multicast address used for IP6.
1112 * (This is used for multicast routers.)
1113 */
1114 ifp->if_flags |= IFF_ALLMULTI;
1115 *llsa = 0;
1116 return 0;
1117 }
1118 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1119 return EADDRNOTAVAIL;
1120 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1121 M_NOWAIT|M_ZERO);
1122 if (sdl == NULL)
1123 return (ENOMEM);
1124 sdl->sdl_len = sizeof *sdl;
1125 sdl->sdl_family = AF_LINK;
1126 sdl->sdl_index = ifp->if_index;
1127 sdl->sdl_type = IFT_ETHER;
1128 sdl->sdl_alen = ETHER_ADDR_LEN;
1129 e_addr = LLADDR(sdl);
1130 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1131 *llsa = (struct sockaddr *)sdl;
1132 return 0;
1133#endif
1134
1135 default:
1136 /*
1137 * Well, the text isn't quite right, but it's the name
1138 * that counts...
1139 */
1140 return EAFNOSUPPORT;
1141 }
1142}
1143
1144static void*
1145ether_alloc(u_char type, struct ifnet *ifp)
1146{
1147 struct arpcom *ac;
1148
1149 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1150 ac->ac_ifp = ifp;
1151
1152 return (ac);
1153}
1154
1155static void
1156ether_free(void *com, u_char type)
1157{
1158
1159 free(com, M_ARPCOM);
1160}
1161
1162static int
1163ether_modevent(module_t mod, int type, void *data)
1164{
1165
1166 switch (type) {
1167 case MOD_LOAD:
1168 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1169 break;
1170 case MOD_UNLOAD:
1171 if_deregister_com_alloc(IFT_ETHER);
1172 break;
1173 default:
1174 return EOPNOTSUPP;
1175 }
1176
1177 return (0);
1178}
1179
1180static moduledata_t ether_mod = {
1181 "ether",
1182 ether_modevent,
1183 0
1184};
1185
1186DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1187MODULE_VERSION(ether, 1);
|