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 1.54 2008/11/22 07:35:45 kmacy 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 #include <sys/vimage.h>
73
74 #include <net/if.h>
75 #include <net/if_types.h>
76 #include <net/bpf.h>
77 #include <net/netisr.h>
78
79 #include <netinet/in.h>
80
81 #include <netgraph/ng_message.h>
82 #include <netgraph/netgraph.h>
83 #include <netgraph/ng_parse.h>
84 #include <netgraph/ng_iface.h>
85 #include <netgraph/ng_cisco.h>
86
87 #ifdef NG_SEPARATE_MALLOC
88 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
89 #else
90 #define M_NETGRAPH_IFACE M_NETGRAPH
91 #endif
92
93 /* This struct describes one address family */
94 struct iffam {
95 sa_family_t family; /* Address family */
96 const char *hookname; /* Name for hook */
97 };
98 typedef const struct iffam *iffam_p;
99
100 /* List of address families supported by our interface */
101 const static struct iffam gFamilies[] = {
102 { AF_INET, NG_IFACE_HOOK_INET },
103 { AF_INET6, NG_IFACE_HOOK_INET6 },
104 { AF_APPLETALK, NG_IFACE_HOOK_ATALK },
105 { AF_IPX, NG_IFACE_HOOK_IPX },
106 { AF_ATM, NG_IFACE_HOOK_ATM },
107 { AF_NATM, NG_IFACE_HOOK_NATM },
108 };
109 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
110
111 /* Node private data */
112 struct ng_iface_private {
113 struct ifnet *ifp; /* Our interface */
114 int unit; /* Interface unit number */
115 node_p node; /* Our netgraph node */
116 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
117 };
118 typedef struct ng_iface_private *priv_p;
119
120 /* Interface methods */
121 static void ng_iface_start(struct ifnet *ifp);
122 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
123 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
124 struct sockaddr *dst, struct rtentry *rt0);
125 static void ng_iface_bpftap(struct ifnet *ifp,
126 struct mbuf *m, sa_family_t family);
127 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m,
128 sa_family_t sa);
129 #ifdef DEBUG
130 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
131 #endif
132
133 /* Netgraph methods */
134 static int ng_iface_mod_event(module_t, int, void *);
135 static ng_constructor_t ng_iface_constructor;
136 static ng_rcvmsg_t ng_iface_rcvmsg;
137 static ng_shutdown_t ng_iface_shutdown;
138 static ng_newhook_t ng_iface_newhook;
139 static ng_rcvdata_t ng_iface_rcvdata;
140 static ng_disconnect_t ng_iface_disconnect;
141
142 /* Helper stuff */
143 static iffam_p get_iffam_from_af(sa_family_t family);
144 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
145 static iffam_p get_iffam_from_name(const char *name);
146 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
147
148 /* Parse type for struct ng_cisco_ipaddr */
149 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
150 = NG_CISCO_IPADDR_TYPE_INFO;
151 static const struct ng_parse_type ng_cisco_ipaddr_type = {
152 &ng_parse_struct_type,
153 &ng_cisco_ipaddr_type_fields
154 };
155
156 /* List of commands and how to convert arguments to/from ASCII */
157 static const struct ng_cmdlist ng_iface_cmds[] = {
158 {
159 NGM_IFACE_COOKIE,
160 NGM_IFACE_GET_IFNAME,
161 "getifname",
162 NULL,
163 &ng_parse_string_type
164 },
165 {
166 NGM_IFACE_COOKIE,
167 NGM_IFACE_POINT2POINT,
168 "point2point",
169 NULL,
170 NULL
171 },
172 {
173 NGM_IFACE_COOKIE,
174 NGM_IFACE_BROADCAST,
175 "broadcast",
176 NULL,
177 NULL
178 },
179 {
180 NGM_CISCO_COOKIE,
181 NGM_CISCO_GET_IPADDR,
182 "getipaddr",
183 NULL,
184 &ng_cisco_ipaddr_type
185 },
186 {
187 NGM_IFACE_COOKIE,
188 NGM_IFACE_GET_IFINDEX,
189 "getifindex",
190 NULL,
191 &ng_parse_uint32_type
192 },
193 { 0 }
194 };
195
196 /* Node type descriptor */
197 static struct ng_type typestruct = {
198 .version = NG_ABI_VERSION,
199 .name = NG_IFACE_NODE_TYPE,
200 .mod_event = ng_iface_mod_event,
201 .constructor = ng_iface_constructor,
202 .rcvmsg = ng_iface_rcvmsg,
203 .shutdown = ng_iface_shutdown,
204 .newhook = ng_iface_newhook,
205 .rcvdata = ng_iface_rcvdata,
206 .disconnect = ng_iface_disconnect,
207 .cmdlist = ng_iface_cmds,
208 };
209 NETGRAPH_INIT(iface, &typestruct);
210
211 static struct unrhdr *ng_iface_unit;
212
213 /************************************************************************
214 HELPER STUFF
215 ************************************************************************/
216
217 /*
218 * Get the family descriptor from the family ID
219 */
220 static __inline iffam_p
221 get_iffam_from_af(sa_family_t family)
222 {
223 iffam_p iffam;
224 int k;
225
226 for (k = 0; k < NUM_FAMILIES; k++) {
227 iffam = &gFamilies[k];
228 if (iffam->family == family)
229 return (iffam);
230 }
231 return (NULL);
232 }
233
234 /*
235 * Get the family descriptor from the hook
236 */
237 static __inline iffam_p
238 get_iffam_from_hook(priv_p priv, hook_p hook)
239 {
240 int k;
241
242 for (k = 0; k < NUM_FAMILIES; k++)
243 if (priv->hooks[k] == hook)
244 return (&gFamilies[k]);
245 return (NULL);
246 }
247
248 /*
249 * Get the hook from the iffam descriptor
250 */
251
252 static __inline hook_p *
253 get_hook_from_iffam(priv_p priv, iffam_p iffam)
254 {
255 return (&priv->hooks[iffam - gFamilies]);
256 }
257
258 /*
259 * Get the iffam descriptor from the name
260 */
261 static __inline iffam_p
262 get_iffam_from_name(const char *name)
263 {
264 iffam_p iffam;
265 int k;
266
267 for (k = 0; k < NUM_FAMILIES; k++) {
268 iffam = &gFamilies[k];
269 if (!strcmp(iffam->hookname, name))
270 return (iffam);
271 }
272 return (NULL);
273 }
274
275 /************************************************************************
276 INTERFACE STUFF
277 ************************************************************************/
278
279 /*
280 * Process an ioctl for the virtual interface
281 */
282 static int
283 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
284 {
285 struct ifreq *const ifr = (struct ifreq *) data;
286 int s, error = 0;
287
288 #ifdef DEBUG
289 ng_iface_print_ioctl(ifp, command, data);
290 #endif
291 s = splimp();
292 switch (command) {
293
294 /* These two are mostly handled at a higher layer */
295 case SIOCSIFADDR:
296 ifp->if_flags |= IFF_UP;
297 ifp->if_drv_flags |= IFF_DRV_RUNNING;
298 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
299 break;
300 case SIOCGIFADDR:
301 break;
302
303 /* Set flags */
304 case SIOCSIFFLAGS:
305 /*
306 * If the interface is marked up and stopped, then start it.
307 * If it is marked down and running, then stop it.
308 */
309 if (ifr->ifr_flags & IFF_UP) {
310 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
311 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
312 ifp->if_drv_flags |= IFF_DRV_RUNNING;
313 }
314 } else {
315 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
316 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
317 IFF_DRV_OACTIVE);
318 }
319 break;
320
321 /* Set the interface MTU */
322 case SIOCSIFMTU:
323 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
324 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
325 error = EINVAL;
326 else
327 ifp->if_mtu = ifr->ifr_mtu;
328 break;
329
330 /* Stuff that's not supported */
331 case SIOCADDMULTI:
332 case SIOCDELMULTI:
333 error = 0;
334 break;
335 case SIOCSIFPHYS:
336 error = EOPNOTSUPP;
337 break;
338
339 default:
340 error = EINVAL;
341 break;
342 }
343 (void) splx(s);
344 return (error);
345 }
346
347 /*
348 * This routine is called to deliver a packet out the interface.
349 * We simply look at the address family and relay the packet to
350 * the corresponding hook, if it exists and is connected.
351 */
352
353 static int
354 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
355 struct sockaddr *dst, struct rtentry *rt0)
356 {
357 uint32_t af;
358 int error;
359
360 /* Check interface flags */
361 if (!((ifp->if_flags & IFF_UP) &&
362 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
363 m_freem(m);
364 return (ENETDOWN);
365 }
366
367 /* BPF writes need to be handled specially. */
368 if (dst->sa_family == AF_UNSPEC) {
369 bcopy(dst->sa_data, &af, sizeof(af));
370 dst->sa_family = af;
371 }
372
373 /* Berkeley packet filter */
374 ng_iface_bpftap(ifp, m, dst->sa_family);
375
376 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
377 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
378 if (m == NULL) {
379 IFQ_LOCK(&ifp->if_snd);
380 IFQ_INC_DROPS(&ifp->if_snd);
381 IFQ_UNLOCK(&ifp->if_snd);
382 ifp->if_oerrors++;
383 return (ENOBUFS);
384 }
385 *(sa_family_t *)m->m_data = dst->sa_family;
386 error = (ifp->if_transmit)(ifp, m);
387 } else
388 error = ng_iface_send(ifp, m, dst->sa_family);
389
390 return (error);
391 }
392
393 /*
394 * Start method is used only when ALTQ is enabled.
395 */
396 static void
397 ng_iface_start(struct ifnet *ifp)
398 {
399 struct mbuf *m;
400 sa_family_t sa;
401
402 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
403
404 for(;;) {
405 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
406 if (m == NULL)
407 break;
408 sa = *mtod(m, sa_family_t *);
409 m_adj(m, sizeof(sa_family_t));
410 ng_iface_send(ifp, m, sa);
411 }
412 }
413
414 /*
415 * Flash a packet by the BPF (requires prepending 4 byte AF header)
416 * Note the phoney mbuf; this is OK because BPF treats it read-only.
417 */
418 static void
419 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
420 {
421 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
422 if (bpf_peers_present(ifp->if_bpf)) {
423 int32_t family4 = (int32_t)family;
424 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
425 }
426 }
427
428 /*
429 * This routine does actual delivery of the packet into the
430 * netgraph(4). It is called from ng_iface_start() and
431 * ng_iface_output().
432 */
433 static int
434 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
435 {
436 const priv_p priv = (priv_p) ifp->if_softc;
437 const iffam_p iffam = get_iffam_from_af(sa);
438 int error;
439 int len;
440
441 /* Check address family to determine hook (if known) */
442 if (iffam == NULL) {
443 m_freem(m);
444 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
445 return (EAFNOSUPPORT);
446 }
447
448 /* Copy length before the mbuf gets invalidated. */
449 len = m->m_pkthdr.len;
450
451 /* Send packet. If hook is not connected,
452 mbuf will get freed. */
453 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
454
455 /* Update stats. */
456 if (error == 0) {
457 ifp->if_obytes += len;
458 ifp->if_opackets++;
459 }
460
461 return (error);
462 }
463
464 #ifdef DEBUG
465 /*
466 * Display an ioctl to the virtual interface
467 */
468
469 static void
470 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
471 {
472 char *str;
473
474 switch (command & IOC_DIRMASK) {
475 case IOC_VOID:
476 str = "IO";
477 break;
478 case IOC_OUT:
479 str = "IOR";
480 break;
481 case IOC_IN:
482 str = "IOW";
483 break;
484 case IOC_INOUT:
485 str = "IORW";
486 break;
487 default:
488 str = "IO??";
489 }
490 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
491 ifp->if_xname,
492 str,
493 IOCGROUP(command),
494 command & 0xff,
495 IOCPARM_LEN(command));
496 }
497 #endif /* DEBUG */
498
499 /************************************************************************
500 NETGRAPH NODE STUFF
501 ************************************************************************/
502
503 /*
504 * Constructor for a node
505 */
506 static int
507 ng_iface_constructor(node_p node)
508 {
509 INIT_VNET_NETGRAPH(curvnet);
510 struct ifnet *ifp;
511 priv_p priv;
512
513 /* Allocate node and interface private structures */
514 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
515 if (priv == NULL)
516 return (ENOMEM);
517 ifp = if_alloc(IFT_PROPVIRTUAL);
518 if (ifp == NULL) {
519 free(priv, M_NETGRAPH_IFACE);
520 return (ENOMEM);
521 }
522
523 /* Link them together */
524 ifp->if_softc = priv;
525 priv->ifp = ifp;
526
527 /* Get an interface unit number */
528 priv->unit = alloc_unr(V_ng_iface_unit);
529
530 /* Link together node and private info */
531 NG_NODE_SET_PRIVATE(node, priv);
532 priv->node = node;
533
534 /* Initialize interface structure */
535 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
536 ifp->if_output = ng_iface_output;
537 ifp->if_start = ng_iface_start;
538 ifp->if_ioctl = ng_iface_ioctl;
539 ifp->if_watchdog = NULL;
540 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
541 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
542 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
543 ifp->if_addrlen = 0; /* XXX */
544 ifp->if_hdrlen = 0; /* XXX */
545 ifp->if_baudrate = 64000; /* XXX */
546 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
547 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
548 IFQ_SET_READY(&ifp->if_snd);
549
550 /* Give this node the same name as the interface (if possible) */
551 if (ng_name_node(node, ifp->if_xname) != 0)
552 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
553 ifp->if_xname);
554
555 /* Attach the interface */
556 if_attach(ifp);
557 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
558
559 /* Done */
560 return (0);
561 }
562
563 /*
564 * Give our ok for a hook to be added
565 */
566 static int
567 ng_iface_newhook(node_p node, hook_p hook, const char *name)
568 {
569 const iffam_p iffam = get_iffam_from_name(name);
570 hook_p *hookptr;
571
572 if (iffam == NULL)
573 return (EPFNOSUPPORT);
574 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
575 if (*hookptr != NULL)
576 return (EISCONN);
577 *hookptr = hook;
578 NG_HOOK_HI_STACK(hook);
579 return (0);
580 }
581
582 /*
583 * Receive a control message
584 */
585 static int
586 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
587 {
588 const priv_p priv = NG_NODE_PRIVATE(node);
589 struct ifnet *const ifp = priv->ifp;
590 struct ng_mesg *resp = NULL;
591 int error = 0;
592 struct ng_mesg *msg;
593
594 NGI_GET_MSG(item, msg);
595 switch (msg->header.typecookie) {
596 case NGM_IFACE_COOKIE:
597 switch (msg->header.cmd) {
598 case NGM_IFACE_GET_IFNAME:
599 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
600 if (resp == NULL) {
601 error = ENOMEM;
602 break;
603 }
604 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
605 break;
606
607 case NGM_IFACE_POINT2POINT:
608 case NGM_IFACE_BROADCAST:
609 {
610
611 /* Deny request if interface is UP */
612 if ((ifp->if_flags & IFF_UP) != 0)
613 return (EBUSY);
614
615 /* Change flags */
616 switch (msg->header.cmd) {
617 case NGM_IFACE_POINT2POINT:
618 ifp->if_flags |= IFF_POINTOPOINT;
619 ifp->if_flags &= ~IFF_BROADCAST;
620 break;
621 case NGM_IFACE_BROADCAST:
622 ifp->if_flags &= ~IFF_POINTOPOINT;
623 ifp->if_flags |= IFF_BROADCAST;
624 break;
625 }
626 break;
627 }
628
629 case NGM_IFACE_GET_IFINDEX:
630 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
631 if (resp == NULL) {
632 error = ENOMEM;
633 break;
634 }
635 *((uint32_t *)resp->data) = priv->ifp->if_index;
636 break;
637
638 default:
639 error = EINVAL;
640 break;
641 }
642 break;
643 case NGM_CISCO_COOKIE:
644 switch (msg->header.cmd) {
645 case NGM_CISCO_GET_IPADDR: /* we understand this too */
646 {
647 struct ifaddr *ifa;
648
649 /* Return the first configured IP address */
650 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
651 struct ng_cisco_ipaddr *ips;
652
653 if (ifa->ifa_addr->sa_family != AF_INET)
654 continue;
655 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
656 if (resp == NULL) {
657 error = ENOMEM;
658 break;
659 }
660 ips = (struct ng_cisco_ipaddr *)resp->data;
661 ips->ipaddr = ((struct sockaddr_in *)
662 ifa->ifa_addr)->sin_addr;
663 ips->netmask = ((struct sockaddr_in *)
664 ifa->ifa_netmask)->sin_addr;
665 break;
666 }
667
668 /* No IP addresses on this interface? */
669 if (ifa == NULL)
670 error = EADDRNOTAVAIL;
671 break;
672 }
673 default:
674 error = EINVAL;
675 break;
676 }
677 break;
678 case NGM_FLOW_COOKIE:
679 switch (msg->header.cmd) {
680 case NGM_LINK_IS_UP:
681 ifp->if_drv_flags |= IFF_DRV_RUNNING;
682 break;
683 case NGM_LINK_IS_DOWN:
684 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
685 break;
686 default:
687 break;
688 }
689 break;
690 default:
691 error = EINVAL;
692 break;
693 }
694 NG_RESPOND_MSG(error, node, item, resp);
695 NG_FREE_MSG(msg);
696 return (error);
697 }
698
699 /*
700 * Recive data from a hook. Pass the packet to the correct input routine.
701 */
702 static int
703 ng_iface_rcvdata(hook_p hook, item_p item)
704 {
705 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
706 const iffam_p iffam = get_iffam_from_hook(priv, hook);
707 struct ifnet *const ifp = priv->ifp;
708 struct mbuf *m;
709 int isr;
710
711 NGI_GET_M(item, m);
712 NG_FREE_ITEM(item);
713 /* Sanity checks */
714 KASSERT(iffam != NULL, ("%s: iffam", __func__));
715 M_ASSERTPKTHDR(m);
716 if ((ifp->if_flags & IFF_UP) == 0) {
717 NG_FREE_M(m);
718 return (ENETDOWN);
719 }
720
721 /* Update interface stats */
722 ifp->if_ipackets++;
723 ifp->if_ibytes += m->m_pkthdr.len;
724
725 /* Note receiving interface */
726 m->m_pkthdr.rcvif = ifp;
727
728 /* Berkeley packet filter */
729 ng_iface_bpftap(ifp, m, iffam->family);
730
731 /* Send packet */
732 switch (iffam->family) {
733 #ifdef INET
734 case AF_INET:
735 isr = NETISR_IP;
736 break;
737 #endif
738 #ifdef INET6
739 case AF_INET6:
740 isr = NETISR_IPV6;
741 break;
742 #endif
743 #ifdef IPX
744 case AF_IPX:
745 isr = NETISR_IPX;
746 break;
747 #endif
748 #ifdef NETATALK
749 case AF_APPLETALK:
750 isr = NETISR_ATALK2;
751 break;
752 #endif
753 default:
754 m_freem(m);
755 return (EAFNOSUPPORT);
756 }
757 /* First chunk of an mbuf contains good junk */
758 if (harvest.point_to_point)
759 random_harvest(m, 16, 3, 0, RANDOM_NET);
760 netisr_dispatch(isr, m);
761 return (0);
762 }
763
764 /*
765 * Shutdown and remove the node and its associated interface.
766 */
767 static int
768 ng_iface_shutdown(node_p node)
769 {
770 INIT_VNET_NETGRAPH(curvnet);
771 const priv_p priv = NG_NODE_PRIVATE(node);
772
773 /*
774 * The ifnet may be in a different vnet than the netgraph node,
775 * hence we have to change the current vnet context here.
776 */
777 CURVNET_SET_QUIET(priv->ifp->if_vnet);
778 bpfdetach(priv->ifp);
779 if_detach(priv->ifp);
780 if_free(priv->ifp);
781 CURVNET_RESTORE();
782 priv->ifp = NULL;
783 free_unr(V_ng_iface_unit, priv->unit);
784 free(priv, M_NETGRAPH_IFACE);
785 NG_NODE_SET_PRIVATE(node, NULL);
786 NG_NODE_UNREF(node);
787 return (0);
788 }
789
790 /*
791 * Hook disconnection. Note that we do *not* shutdown when all
792 * hooks have been disconnected.
793 */
794 static int
795 ng_iface_disconnect(hook_p hook)
796 {
797 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
798 const iffam_p iffam = get_iffam_from_hook(priv, hook);
799
800 if (iffam == NULL)
801 panic(__func__);
802 *get_hook_from_iffam(priv, iffam) = NULL;
803 return (0);
804 }
805
806 /*
807 * Handle loading and unloading for this node type.
808 */
809 static int
810 ng_iface_mod_event(module_t mod, int event, void *data)
811 {
812 int error = 0;
813
814 switch (event) {
815 case MOD_LOAD:
816 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
817 break;
818 case MOD_UNLOAD:
819 delete_unrhdr(V_ng_iface_unit);
820 break;
821 default:
822 error = EOPNOTSUPP;
823 break;
824 }
825 return (error);
826 }
827
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