1 /*
2 * ng_iface.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Archie Cobbs <archie@freebsd.org>
39 *
40 * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.34.2.3 2005/05/27 12:03:11 glebius Exp $
41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
42 */
43
44 /*
45 * This node is also a system networking interface. It has
46 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
47 * are simply relayed between the interface and the hooks.
48 *
49 * Interfaces are named ng0, ng1, etc. New nodes take the
50 * first available interface name.
51 *
52 * This node also includes Berkeley packet filter support.
53 */
54
55 #include "opt_atalk.h"
56 #include "opt_inet.h"
57 #include "opt_inet6.h"
58 #include "opt_ipx.h"
59
60 #include <sys/param.h>
61 #include <sys/systm.h>
62 #include <sys/errno.h>
63 #include <sys/kernel.h>
64 #include <sys/malloc.h>
65 #include <sys/mbuf.h>
66 #include <sys/errno.h>
67 #include <sys/random.h>
68 #include <sys/sockio.h>
69 #include <sys/socket.h>
70 #include <sys/syslog.h>
71 #include <sys/libkern.h>
72
73 #include <net/if.h>
74 #include <net/if_types.h>
75 #include <net/bpf.h>
76 #include <net/netisr.h>
77
78 #include <netinet/in.h>
79
80 #include <netgraph/ng_message.h>
81 #include <netgraph/netgraph.h>
82 #include <netgraph/ng_parse.h>
83 #include <netgraph/ng_iface.h>
84 #include <netgraph/ng_cisco.h>
85
86 #ifdef NG_SEPARATE_MALLOC
87 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
88 #else
89 #define M_NETGRAPH_IFACE M_NETGRAPH
90 #endif
91
92 /* This struct describes one address family */
93 struct iffam {
94 sa_family_t family; /* Address family */
95 const char *hookname; /* Name for hook */
96 };
97 typedef const struct iffam *iffam_p;
98
99 /* List of address families supported by our interface */
100 const static struct iffam gFamilies[] = {
101 { AF_INET, NG_IFACE_HOOK_INET },
102 { AF_INET6, NG_IFACE_HOOK_INET6 },
103 { AF_APPLETALK, NG_IFACE_HOOK_ATALK },
104 { AF_IPX, NG_IFACE_HOOK_IPX },
105 { AF_ATM, NG_IFACE_HOOK_ATM },
106 { AF_NATM, NG_IFACE_HOOK_NATM },
107 };
108 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
109
110 /* Node private data */
111 struct ng_iface_private {
112 struct ifnet *ifp; /* Our interface */
113 int unit; /* Interface unit number */
114 node_p node; /* Our netgraph node */
115 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
116 };
117 typedef struct ng_iface_private *priv_p;
118
119 /* Interface methods */
120 static void ng_iface_start(struct ifnet *ifp);
121 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
122 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
123 struct sockaddr *dst, struct rtentry *rt0);
124 static void ng_iface_bpftap(struct ifnet *ifp,
125 struct mbuf *m, sa_family_t family);
126 #ifdef DEBUG
127 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
128 #endif
129
130 /* Netgraph methods */
131 static int ng_iface_mod_event(module_t, int, void *);
132 static ng_constructor_t ng_iface_constructor;
133 static ng_rcvmsg_t ng_iface_rcvmsg;
134 static ng_shutdown_t ng_iface_shutdown;
135 static ng_newhook_t ng_iface_newhook;
136 static ng_rcvdata_t ng_iface_rcvdata;
137 static ng_disconnect_t ng_iface_disconnect;
138
139 /* Helper stuff */
140 static iffam_p get_iffam_from_af(sa_family_t family);
141 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
142 static iffam_p get_iffam_from_name(const char *name);
143 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
144
145 /* Parse type for struct ng_iface_ifname */
146 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = {
147 NG_IFACE_IFACE_NAME_MAX + 1
148 };
149 static const struct ng_parse_type ng_iface_ifname_type = {
150 &ng_parse_fixedstring_type,
151 &ng_iface_ifname_info
152 };
153
154 /* Parse type for struct ng_cisco_ipaddr */
155 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
156 = NG_CISCO_IPADDR_TYPE_INFO;
157 static const struct ng_parse_type ng_cisco_ipaddr_type = {
158 &ng_parse_struct_type,
159 &ng_cisco_ipaddr_type_fields
160 };
161
162 /* List of commands and how to convert arguments to/from ASCII */
163 static const struct ng_cmdlist ng_iface_cmds[] = {
164 {
165 NGM_IFACE_COOKIE,
166 NGM_IFACE_GET_IFNAME,
167 "getifname",
168 NULL,
169 &ng_iface_ifname_type
170 },
171 {
172 NGM_IFACE_COOKIE,
173 NGM_IFACE_POINT2POINT,
174 "point2point",
175 NULL,
176 NULL
177 },
178 {
179 NGM_IFACE_COOKIE,
180 NGM_IFACE_BROADCAST,
181 "broadcast",
182 NULL,
183 NULL
184 },
185 {
186 NGM_CISCO_COOKIE,
187 NGM_CISCO_GET_IPADDR,
188 "getipaddr",
189 NULL,
190 &ng_cisco_ipaddr_type
191 },
192 {
193 NGM_IFACE_COOKIE,
194 NGM_IFACE_GET_IFINDEX,
195 "getifindex",
196 NULL,
197 &ng_parse_uint32_type
198 },
199 { 0 }
200 };
201
202 /* Node type descriptor */
203 static struct ng_type typestruct = {
204 .version = NG_ABI_VERSION,
205 .name = NG_IFACE_NODE_TYPE,
206 .mod_event = ng_iface_mod_event,
207 .constructor = ng_iface_constructor,
208 .rcvmsg = ng_iface_rcvmsg,
209 .shutdown = ng_iface_shutdown,
210 .newhook = ng_iface_newhook,
211 .rcvdata = ng_iface_rcvdata,
212 .disconnect = ng_iface_disconnect,
213 .cmdlist = ng_iface_cmds,
214 };
215 NETGRAPH_INIT(iface, &typestruct);
216
217 static struct unrhdr *ng_iface_unit;
218
219 /************************************************************************
220 HELPER STUFF
221 ************************************************************************/
222
223 /*
224 * Get the family descriptor from the family ID
225 */
226 static __inline iffam_p
227 get_iffam_from_af(sa_family_t family)
228 {
229 iffam_p iffam;
230 int k;
231
232 for (k = 0; k < NUM_FAMILIES; k++) {
233 iffam = &gFamilies[k];
234 if (iffam->family == family)
235 return (iffam);
236 }
237 return (NULL);
238 }
239
240 /*
241 * Get the family descriptor from the hook
242 */
243 static __inline iffam_p
244 get_iffam_from_hook(priv_p priv, hook_p hook)
245 {
246 int k;
247
248 for (k = 0; k < NUM_FAMILIES; k++)
249 if (priv->hooks[k] == hook)
250 return (&gFamilies[k]);
251 return (NULL);
252 }
253
254 /*
255 * Get the hook from the iffam descriptor
256 */
257
258 static __inline hook_p *
259 get_hook_from_iffam(priv_p priv, iffam_p iffam)
260 {
261 return (&priv->hooks[iffam - gFamilies]);
262 }
263
264 /*
265 * Get the iffam descriptor from the name
266 */
267 static __inline iffam_p
268 get_iffam_from_name(const char *name)
269 {
270 iffam_p iffam;
271 int k;
272
273 for (k = 0; k < NUM_FAMILIES; k++) {
274 iffam = &gFamilies[k];
275 if (!strcmp(iffam->hookname, name))
276 return (iffam);
277 }
278 return (NULL);
279 }
280
281 /************************************************************************
282 INTERFACE STUFF
283 ************************************************************************/
284
285 /*
286 * Process an ioctl for the virtual interface
287 */
288 static int
289 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
290 {
291 struct ifreq *const ifr = (struct ifreq *) data;
292 int s, error = 0;
293
294 #ifdef DEBUG
295 ng_iface_print_ioctl(ifp, command, data);
296 #endif
297 s = splimp();
298 switch (command) {
299
300 /* These two are mostly handled at a higher layer */
301 case SIOCSIFADDR:
302 ifp->if_flags |= (IFF_UP | IFF_RUNNING);
303 ifp->if_flags &= ~(IFF_OACTIVE);
304 break;
305 case SIOCGIFADDR:
306 break;
307
308 /* Set flags */
309 case SIOCSIFFLAGS:
310 /*
311 * If the interface is marked up and stopped, then start it.
312 * If it is marked down and running, then stop it.
313 */
314 if (ifr->ifr_flags & IFF_UP) {
315 if (!(ifp->if_flags & IFF_RUNNING)) {
316 ifp->if_flags &= ~(IFF_OACTIVE);
317 ifp->if_flags |= IFF_RUNNING;
318 }
319 } else {
320 if (ifp->if_flags & IFF_RUNNING)
321 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
322 }
323 break;
324
325 /* Set the interface MTU */
326 case SIOCSIFMTU:
327 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
328 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
329 error = EINVAL;
330 else
331 ifp->if_mtu = ifr->ifr_mtu;
332 break;
333
334 /* Stuff that's not supported */
335 case SIOCADDMULTI:
336 case SIOCDELMULTI:
337 error = 0;
338 break;
339 case SIOCSIFPHYS:
340 error = EOPNOTSUPP;
341 break;
342
343 default:
344 error = EINVAL;
345 break;
346 }
347 (void) splx(s);
348 return (error);
349 }
350
351 /*
352 * This routine is called to deliver a packet out the interface.
353 * We simply look at the address family and relay the packet to
354 * the corresponding hook, if it exists and is connected.
355 */
356
357 static int
358 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
359 struct sockaddr *dst, struct rtentry *rt0)
360 {
361 const priv_p priv = (priv_p) ifp->if_softc;
362 const iffam_p iffam = get_iffam_from_af(dst->sa_family);
363 int len, error = 0;
364
365 /* Check interface flags */
366 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
367 m_freem(m);
368 return (ENETDOWN);
369 }
370
371 /* BPF writes need to be handled specially */
372 if (dst->sa_family == AF_UNSPEC) {
373 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
374 return (ENOBUFS);
375 dst->sa_family = (sa_family_t)*mtod(m, int32_t *);
376 m->m_data += 4;
377 m->m_len -= 4;
378 m->m_pkthdr.len -= 4;
379 }
380
381 /* Berkeley packet filter */
382 ng_iface_bpftap(ifp, m, dst->sa_family);
383
384 /* Check address family to determine hook (if known) */
385 if (iffam == NULL) {
386 m_freem(m);
387 log(LOG_WARNING, "%s: can't handle af%d\n",
388 ifp->if_xname, (int)dst->sa_family);
389 return (EAFNOSUPPORT);
390 }
391
392 /* Copy length before the mbuf gets invalidated */
393 len = m->m_pkthdr.len;
394
395 /* Send packet; if hook is not connected, mbuf will get freed. */
396 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
397
398 /* Update stats */
399 if (error == 0) {
400 ifp->if_obytes += len;
401 ifp->if_opackets++;
402 }
403 return (error);
404 }
405
406 /*
407 * This routine should never be called
408 */
409
410 static void
411 ng_iface_start(struct ifnet *ifp)
412 {
413 if_printf(ifp, "%s called?", __func__);
414 }
415
416 /*
417 * Flash a packet by the BPF (requires prepending 4 byte AF header)
418 * Note the phoney mbuf; this is OK because BPF treats it read-only.
419 */
420 static void
421 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
422 {
423 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
424 if (ifp->if_bpf != NULL) {
425 int32_t family4 = (int32_t)family;
426 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
427 }
428 }
429
430 #ifdef DEBUG
431 /*
432 * Display an ioctl to the virtual interface
433 */
434
435 static void
436 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
437 {
438 char *str;
439
440 switch (command & IOC_DIRMASK) {
441 case IOC_VOID:
442 str = "IO";
443 break;
444 case IOC_OUT:
445 str = "IOR";
446 break;
447 case IOC_IN:
448 str = "IOW";
449 break;
450 case IOC_INOUT:
451 str = "IORW";
452 break;
453 default:
454 str = "IO??";
455 }
456 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
457 ifp->if_xname,
458 str,
459 IOCGROUP(command),
460 command & 0xff,
461 IOCPARM_LEN(command));
462 }
463 #endif /* DEBUG */
464
465 /************************************************************************
466 NETGRAPH NODE STUFF
467 ************************************************************************/
468
469 /*
470 * Constructor for a node
471 */
472 static int
473 ng_iface_constructor(node_p node)
474 {
475 char ifname[NG_IFACE_IFACE_NAME_MAX + 1];
476 struct ifnet *ifp;
477 priv_p priv;
478
479 /* Allocate node and interface private structures */
480 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
481 if (priv == NULL)
482 return (ENOMEM);
483 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
484 if (ifp == NULL) {
485 FREE(priv, M_NETGRAPH_IFACE);
486 return (ENOMEM);
487 }
488
489 /* Link them together */
490 ifp->if_softc = priv;
491 priv->ifp = ifp;
492
493 /* Get an interface unit number */
494 priv->unit = alloc_unr(ng_iface_unit);
495
496 /* Link together node and private info */
497 NG_NODE_SET_PRIVATE(node, priv);
498 priv->node = node;
499
500 /* Initialize interface structure */
501 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
502 ifp->if_output = ng_iface_output;
503 ifp->if_start = ng_iface_start;
504 ifp->if_ioctl = ng_iface_ioctl;
505 ifp->if_watchdog = NULL;
506 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
507 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
508 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
509 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
510 ifp->if_addrlen = 0; /* XXX */
511 ifp->if_hdrlen = 0; /* XXX */
512 ifp->if_baudrate = 64000; /* XXX */
513 TAILQ_INIT(&ifp->if_addrhead);
514
515 /* Give this node the same name as the interface (if possible) */
516 bzero(ifname, sizeof(ifname));
517 strlcpy(ifname, ifp->if_xname, sizeof(ifname));
518 if (ng_name_node(node, ifname) != 0)
519 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
520
521 /* Attach the interface */
522 if_attach(ifp);
523 bpfattach(ifp, DLT_NULL, sizeof(u_int));
524
525 /* Done */
526 return (0);
527 }
528
529 /*
530 * Give our ok for a hook to be added
531 */
532 static int
533 ng_iface_newhook(node_p node, hook_p hook, const char *name)
534 {
535 const iffam_p iffam = get_iffam_from_name(name);
536 hook_p *hookptr;
537
538 if (iffam == NULL)
539 return (EPFNOSUPPORT);
540 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
541 if (*hookptr != NULL)
542 return (EISCONN);
543 *hookptr = hook;
544 return (0);
545 }
546
547 /*
548 * Receive a control message
549 */
550 static int
551 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
552 {
553 const priv_p priv = NG_NODE_PRIVATE(node);
554 struct ifnet *const ifp = priv->ifp;
555 struct ng_mesg *resp = NULL;
556 int error = 0;
557 struct ng_mesg *msg;
558
559 NGI_GET_MSG(item, msg);
560 switch (msg->header.typecookie) {
561 case NGM_IFACE_COOKIE:
562 switch (msg->header.cmd) {
563 case NGM_IFACE_GET_IFNAME:
564 {
565 struct ng_iface_ifname *arg;
566
567 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
568 if (resp == NULL) {
569 error = ENOMEM;
570 break;
571 }
572 arg = (struct ng_iface_ifname *)resp->data;
573 strlcpy(arg->ngif_name, ifp->if_xname,
574 sizeof(arg->ngif_name));
575 break;
576 }
577
578 case NGM_IFACE_POINT2POINT:
579 case NGM_IFACE_BROADCAST:
580 {
581
582 /* Deny request if interface is UP */
583 if ((ifp->if_flags & IFF_UP) != 0)
584 return (EBUSY);
585
586 /* Change flags */
587 switch (msg->header.cmd) {
588 case NGM_IFACE_POINT2POINT:
589 ifp->if_flags |= IFF_POINTOPOINT;
590 ifp->if_flags &= ~IFF_BROADCAST;
591 break;
592 case NGM_IFACE_BROADCAST:
593 ifp->if_flags &= ~IFF_POINTOPOINT;
594 ifp->if_flags |= IFF_BROADCAST;
595 break;
596 }
597 break;
598 }
599
600 case NGM_IFACE_GET_IFINDEX:
601 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
602 if (resp == NULL) {
603 error = ENOMEM;
604 break;
605 }
606 *((uint32_t *)resp->data) = priv->ifp->if_index;
607 break;
608
609 default:
610 error = EINVAL;
611 break;
612 }
613 break;
614 case NGM_CISCO_COOKIE:
615 switch (msg->header.cmd) {
616 case NGM_CISCO_GET_IPADDR: /* we understand this too */
617 {
618 struct ifaddr *ifa;
619
620 /* Return the first configured IP address */
621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
622 struct ng_cisco_ipaddr *ips;
623
624 if (ifa->ifa_addr->sa_family != AF_INET)
625 continue;
626 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
627 if (resp == NULL) {
628 error = ENOMEM;
629 break;
630 }
631 ips = (struct ng_cisco_ipaddr *)resp->data;
632 ips->ipaddr = ((struct sockaddr_in *)
633 ifa->ifa_addr)->sin_addr;
634 ips->netmask = ((struct sockaddr_in *)
635 ifa->ifa_netmask)->sin_addr;
636 break;
637 }
638
639 /* No IP addresses on this interface? */
640 if (ifa == NULL)
641 error = EADDRNOTAVAIL;
642 break;
643 }
644 default:
645 error = EINVAL;
646 break;
647 }
648 break;
649 case NGM_FLOW_COOKIE:
650 switch (msg->header.cmd) {
651 case NGM_LINK_IS_UP:
652 ifp->if_flags |= IFF_UP;
653 break;
654 case NGM_LINK_IS_DOWN:
655 ifp->if_flags &= ~IFF_UP;
656 break;
657 default:
658 break;
659 }
660 break;
661 default:
662 error = EINVAL;
663 break;
664 }
665 NG_RESPOND_MSG(error, node, item, resp);
666 NG_FREE_MSG(msg);
667 return (error);
668 }
669
670 /*
671 * Recive data from a hook. Pass the packet to the correct input routine.
672 */
673 static int
674 ng_iface_rcvdata(hook_p hook, item_p item)
675 {
676 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
677 const iffam_p iffam = get_iffam_from_hook(priv, hook);
678 struct ifnet *const ifp = priv->ifp;
679 struct mbuf *m;
680 int isr;
681
682 NGI_GET_M(item, m);
683 NG_FREE_ITEM(item);
684 /* Sanity checks */
685 KASSERT(iffam != NULL, ("%s: iffam", __func__));
686 M_ASSERTPKTHDR(m);
687 if ((ifp->if_flags & IFF_UP) == 0) {
688 NG_FREE_M(m);
689 return (ENETDOWN);
690 }
691
692 /* Update interface stats */
693 ifp->if_ipackets++;
694 ifp->if_ibytes += m->m_pkthdr.len;
695
696 /* Note receiving interface */
697 m->m_pkthdr.rcvif = ifp;
698
699 /* Berkeley packet filter */
700 ng_iface_bpftap(ifp, m, iffam->family);
701
702 /* Send packet */
703 switch (iffam->family) {
704 #ifdef INET
705 case AF_INET:
706 isr = NETISR_IP;
707 break;
708 #endif
709 #ifdef INET6
710 case AF_INET6:
711 isr = NETISR_IPV6;
712 break;
713 #endif
714 #ifdef IPX
715 case AF_IPX:
716 isr = NETISR_IPX;
717 break;
718 #endif
719 #ifdef NETATALK
720 case AF_APPLETALK:
721 isr = NETISR_ATALK2;
722 break;
723 #endif
724 default:
725 m_freem(m);
726 return (EAFNOSUPPORT);
727 }
728 /* First chunk of an mbuf contains good junk */
729 if (harvest.point_to_point)
730 random_harvest(m, 16, 3, 0, RANDOM_NET);
731 netisr_dispatch(isr, m);
732 return (0);
733 }
734
735 /*
736 * Shutdown and remove the node and its associated interface.
737 */
738 static int
739 ng_iface_shutdown(node_p node)
740 {
741 const priv_p priv = NG_NODE_PRIVATE(node);
742
743 bpfdetach(priv->ifp);
744 if_detach(priv->ifp);
745 FREE(priv->ifp, M_NETGRAPH_IFACE);
746 priv->ifp = NULL;
747 free_unr(ng_iface_unit, priv->unit);
748 FREE(priv, M_NETGRAPH_IFACE);
749 NG_NODE_SET_PRIVATE(node, NULL);
750 NG_NODE_UNREF(node);
751 return (0);
752 }
753
754 /*
755 * Hook disconnection. Note that we do *not* shutdown when all
756 * hooks have been disconnected.
757 */
758 static int
759 ng_iface_disconnect(hook_p hook)
760 {
761 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
762 const iffam_p iffam = get_iffam_from_hook(priv, hook);
763
764 if (iffam == NULL)
765 panic(__func__);
766 *get_hook_from_iffam(priv, iffam) = NULL;
767 return (0);
768 }
769
770 /*
771 * Handle loading and unloading for this node type.
772 */
773 static int
774 ng_iface_mod_event(module_t mod, int event, void *data)
775 {
776 int error = 0;
777
778 switch (event) {
779 case MOD_LOAD:
780 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
781 break;
782 case MOD_UNLOAD:
783 delete_unrhdr(ng_iface_unit);
784 break;
785 default:
786 error = EOPNOTSUPP;
787 break;
788 }
789 return (error);
790 }
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