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: releng/6.1/sys/netgraph/ng_iface.c 152235 2005-11-09 11:36:07Z glebius $
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 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m,
127 sa_family_t sa);
128 #ifdef DEBUG
129 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
130 #endif
131
132 /* Netgraph methods */
133 static int ng_iface_mod_event(module_t, int, void *);
134 static ng_constructor_t ng_iface_constructor;
135 static ng_rcvmsg_t ng_iface_rcvmsg;
136 static ng_shutdown_t ng_iface_shutdown;
137 static ng_newhook_t ng_iface_newhook;
138 static ng_rcvdata_t ng_iface_rcvdata;
139 static ng_disconnect_t ng_iface_disconnect;
140
141 /* Helper stuff */
142 static iffam_p get_iffam_from_af(sa_family_t family);
143 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
144 static iffam_p get_iffam_from_name(const char *name);
145 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
146
147 /* Parse type for struct ng_cisco_ipaddr */
148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
149 = NG_CISCO_IPADDR_TYPE_INFO;
150 static const struct ng_parse_type ng_cisco_ipaddr_type = {
151 &ng_parse_struct_type,
152 &ng_cisco_ipaddr_type_fields
153 };
154
155 /* List of commands and how to convert arguments to/from ASCII */
156 static const struct ng_cmdlist ng_iface_cmds[] = {
157 {
158 NGM_IFACE_COOKIE,
159 NGM_IFACE_GET_IFNAME,
160 "getifname",
161 NULL,
162 &ng_parse_string_type
163 },
164 {
165 NGM_IFACE_COOKIE,
166 NGM_IFACE_POINT2POINT,
167 "point2point",
168 NULL,
169 NULL
170 },
171 {
172 NGM_IFACE_COOKIE,
173 NGM_IFACE_BROADCAST,
174 "broadcast",
175 NULL,
176 NULL
177 },
178 {
179 NGM_CISCO_COOKIE,
180 NGM_CISCO_GET_IPADDR,
181 "getipaddr",
182 NULL,
183 &ng_cisco_ipaddr_type
184 },
185 {
186 NGM_IFACE_COOKIE,
187 NGM_IFACE_GET_IFINDEX,
188 "getifindex",
189 NULL,
190 &ng_parse_uint32_type
191 },
192 { 0 }
193 };
194
195 /* Node type descriptor */
196 static struct ng_type typestruct = {
197 .version = NG_ABI_VERSION,
198 .name = NG_IFACE_NODE_TYPE,
199 .mod_event = ng_iface_mod_event,
200 .constructor = ng_iface_constructor,
201 .rcvmsg = ng_iface_rcvmsg,
202 .shutdown = ng_iface_shutdown,
203 .newhook = ng_iface_newhook,
204 .rcvdata = ng_iface_rcvdata,
205 .disconnect = ng_iface_disconnect,
206 .cmdlist = ng_iface_cmds,
207 };
208 NETGRAPH_INIT(iface, &typestruct);
209
210 static struct unrhdr *ng_iface_unit;
211
212 /************************************************************************
213 HELPER STUFF
214 ************************************************************************/
215
216 /*
217 * Get the family descriptor from the family ID
218 */
219 static __inline iffam_p
220 get_iffam_from_af(sa_family_t family)
221 {
222 iffam_p iffam;
223 int k;
224
225 for (k = 0; k < NUM_FAMILIES; k++) {
226 iffam = &gFamilies[k];
227 if (iffam->family == family)
228 return (iffam);
229 }
230 return (NULL);
231 }
232
233 /*
234 * Get the family descriptor from the hook
235 */
236 static __inline iffam_p
237 get_iffam_from_hook(priv_p priv, hook_p hook)
238 {
239 int k;
240
241 for (k = 0; k < NUM_FAMILIES; k++)
242 if (priv->hooks[k] == hook)
243 return (&gFamilies[k]);
244 return (NULL);
245 }
246
247 /*
248 * Get the hook from the iffam descriptor
249 */
250
251 static __inline hook_p *
252 get_hook_from_iffam(priv_p priv, iffam_p iffam)
253 {
254 return (&priv->hooks[iffam - gFamilies]);
255 }
256
257 /*
258 * Get the iffam descriptor from the name
259 */
260 static __inline iffam_p
261 get_iffam_from_name(const char *name)
262 {
263 iffam_p iffam;
264 int k;
265
266 for (k = 0; k < NUM_FAMILIES; k++) {
267 iffam = &gFamilies[k];
268 if (!strcmp(iffam->hookname, name))
269 return (iffam);
270 }
271 return (NULL);
272 }
273
274 /************************************************************************
275 INTERFACE STUFF
276 ************************************************************************/
277
278 /*
279 * Process an ioctl for the virtual interface
280 */
281 static int
282 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
283 {
284 struct ifreq *const ifr = (struct ifreq *) data;
285 int s, error = 0;
286
287 #ifdef DEBUG
288 ng_iface_print_ioctl(ifp, command, data);
289 #endif
290 s = splimp();
291 switch (command) {
292
293 /* These two are mostly handled at a higher layer */
294 case SIOCSIFADDR:
295 ifp->if_flags |= IFF_UP;
296 ifp->if_drv_flags |= IFF_DRV_RUNNING;
297 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
298 break;
299 case SIOCGIFADDR:
300 break;
301
302 /* Set flags */
303 case SIOCSIFFLAGS:
304 /*
305 * If the interface is marked up and stopped, then start it.
306 * If it is marked down and running, then stop it.
307 */
308 if (ifr->ifr_flags & IFF_UP) {
309 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
310 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
311 ifp->if_drv_flags |= IFF_DRV_RUNNING;
312 }
313 } else {
314 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
315 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
316 IFF_DRV_OACTIVE);
317 }
318 break;
319
320 /* Set the interface MTU */
321 case SIOCSIFMTU:
322 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
323 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
324 error = EINVAL;
325 else
326 ifp->if_mtu = ifr->ifr_mtu;
327 break;
328
329 /* Stuff that's not supported */
330 case SIOCADDMULTI:
331 case SIOCDELMULTI:
332 error = 0;
333 break;
334 case SIOCSIFPHYS:
335 error = EOPNOTSUPP;
336 break;
337
338 default:
339 error = EINVAL;
340 break;
341 }
342 (void) splx(s);
343 return (error);
344 }
345
346 /*
347 * This routine is called to deliver a packet out the interface.
348 * We simply look at the address family and relay the packet to
349 * the corresponding hook, if it exists and is connected.
350 */
351
352 static int
353 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
354 struct sockaddr *dst, struct rtentry *rt0)
355 {
356 uint32_t af;
357 int error;
358
359 /* Check interface flags */
360 if (!((ifp->if_flags & IFF_UP) &&
361 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
362 m_freem(m);
363 return (ENETDOWN);
364 }
365
366 /* BPF writes need to be handled specially. */
367 if (dst->sa_family == AF_UNSPEC) {
368 bcopy(dst->sa_data, &af, sizeof(af));
369 dst->sa_family = af;
370 }
371
372 /* Berkeley packet filter */
373 ng_iface_bpftap(ifp, m, dst->sa_family);
374
375 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
376 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
377 if (m == NULL) {
378 IFQ_LOCK(&ifp->if_snd);
379 IFQ_INC_DROPS(&ifp->if_snd);
380 IFQ_UNLOCK(&ifp->if_snd);
381 ifp->if_oerrors++;
382 return (ENOBUFS);
383 }
384 *(sa_family_t *)m->m_data = dst->sa_family;
385 IFQ_HANDOFF(ifp, m, error);
386 } else
387 error = ng_iface_send(ifp, m, dst->sa_family);
388
389 return (error);
390 }
391
392 /*
393 * Start method is used only when ALTQ is enabled.
394 */
395 static void
396 ng_iface_start(struct ifnet *ifp)
397 {
398 struct mbuf *m;
399 sa_family_t sa;
400
401 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
402
403 for(;;) {
404 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
405 if (m == NULL)
406 break;
407 sa = *mtod(m, sa_family_t *);
408 m_adj(m, sizeof(sa_family_t));
409 ng_iface_send(ifp, m, sa);
410 }
411 }
412
413 /*
414 * Flash a packet by the BPF (requires prepending 4 byte AF header)
415 * Note the phoney mbuf; this is OK because BPF treats it read-only.
416 */
417 static void
418 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
419 {
420 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
421 if (ifp->if_bpf != NULL) {
422 int32_t family4 = (int32_t)family;
423 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
424 }
425 }
426
427 /*
428 * This routine does actual delivery of the packet into the
429 * netgraph(4). It is called from ng_iface_start() and
430 * ng_iface_output().
431 */
432 static int
433 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
434 {
435 const priv_p priv = (priv_p) ifp->if_softc;
436 const iffam_p iffam = get_iffam_from_af(sa);
437 int error;
438 int len;
439
440 /* Check address family to determine hook (if known) */
441 if (iffam == NULL) {
442 m_freem(m);
443 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
444 return (EAFNOSUPPORT);
445 }
446
447 /* Copy length before the mbuf gets invalidated. */
448 len = m->m_pkthdr.len;
449
450 /* Send packet. If hook is not connected,
451 mbuf will get freed. */
452 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
453
454 /* Update stats. */
455 if (error == 0) {
456 ifp->if_obytes += len;
457 ifp->if_opackets++;
458 }
459
460 return (error);
461 }
462
463 #ifdef DEBUG
464 /*
465 * Display an ioctl to the virtual interface
466 */
467
468 static void
469 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
470 {
471 char *str;
472
473 switch (command & IOC_DIRMASK) {
474 case IOC_VOID:
475 str = "IO";
476 break;
477 case IOC_OUT:
478 str = "IOR";
479 break;
480 case IOC_IN:
481 str = "IOW";
482 break;
483 case IOC_INOUT:
484 str = "IORW";
485 break;
486 default:
487 str = "IO??";
488 }
489 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
490 ifp->if_xname,
491 str,
492 IOCGROUP(command),
493 command & 0xff,
494 IOCPARM_LEN(command));
495 }
496 #endif /* DEBUG */
497
498 /************************************************************************
499 NETGRAPH NODE STUFF
500 ************************************************************************/
501
502 /*
503 * Constructor for a node
504 */
505 static int
506 ng_iface_constructor(node_p node)
507 {
508 struct ifnet *ifp;
509 priv_p priv;
510
511 /* Allocate node and interface private structures */
512 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
513 if (priv == NULL)
514 return (ENOMEM);
515 ifp = if_alloc(IFT_PROPVIRTUAL);
516 if (ifp == NULL) {
517 FREE(priv, M_NETGRAPH_IFACE);
518 return (ENOMEM);
519 }
520
521 /* Link them together */
522 ifp->if_softc = priv;
523 priv->ifp = ifp;
524
525 /* Get an interface unit number */
526 priv->unit = alloc_unr(ng_iface_unit);
527
528 /* Link together node and private info */
529 NG_NODE_SET_PRIVATE(node, priv);
530 priv->node = node;
531
532 /* Initialize interface structure */
533 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
534 ifp->if_output = ng_iface_output;
535 ifp->if_start = ng_iface_start;
536 ifp->if_ioctl = ng_iface_ioctl;
537 ifp->if_watchdog = NULL;
538 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
539 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
540 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
541 ifp->if_addrlen = 0; /* XXX */
542 ifp->if_hdrlen = 0; /* XXX */
543 ifp->if_baudrate = 64000; /* XXX */
544 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
545 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
546 IFQ_SET_READY(&ifp->if_snd);
547
548 /* Give this node the same name as the interface (if possible) */
549 if (ng_name_node(node, ifp->if_xname) != 0)
550 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
551 ifp->if_xname);
552
553 /* Attach the interface */
554 if_attach(ifp);
555 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
556
557 /* Done */
558 return (0);
559 }
560
561 /*
562 * Give our ok for a hook to be added
563 */
564 static int
565 ng_iface_newhook(node_p node, hook_p hook, const char *name)
566 {
567 const iffam_p iffam = get_iffam_from_name(name);
568 hook_p *hookptr;
569
570 if (iffam == NULL)
571 return (EPFNOSUPPORT);
572 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
573 if (*hookptr != NULL)
574 return (EISCONN);
575 *hookptr = hook;
576 return (0);
577 }
578
579 /*
580 * Receive a control message
581 */
582 static int
583 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
584 {
585 const priv_p priv = NG_NODE_PRIVATE(node);
586 struct ifnet *const ifp = priv->ifp;
587 struct ng_mesg *resp = NULL;
588 int error = 0;
589 struct ng_mesg *msg;
590
591 NGI_GET_MSG(item, msg);
592 switch (msg->header.typecookie) {
593 case NGM_IFACE_COOKIE:
594 switch (msg->header.cmd) {
595 case NGM_IFACE_GET_IFNAME:
596 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
597 if (resp == NULL) {
598 error = ENOMEM;
599 break;
600 }
601 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
602 break;
603
604 case NGM_IFACE_POINT2POINT:
605 case NGM_IFACE_BROADCAST:
606 {
607
608 /* Deny request if interface is UP */
609 if ((ifp->if_flags & IFF_UP) != 0)
610 return (EBUSY);
611
612 /* Change flags */
613 switch (msg->header.cmd) {
614 case NGM_IFACE_POINT2POINT:
615 ifp->if_flags |= IFF_POINTOPOINT;
616 ifp->if_flags &= ~IFF_BROADCAST;
617 break;
618 case NGM_IFACE_BROADCAST:
619 ifp->if_flags &= ~IFF_POINTOPOINT;
620 ifp->if_flags |= IFF_BROADCAST;
621 break;
622 }
623 break;
624 }
625
626 case NGM_IFACE_GET_IFINDEX:
627 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
628 if (resp == NULL) {
629 error = ENOMEM;
630 break;
631 }
632 *((uint32_t *)resp->data) = priv->ifp->if_index;
633 break;
634
635 default:
636 error = EINVAL;
637 break;
638 }
639 break;
640 case NGM_CISCO_COOKIE:
641 switch (msg->header.cmd) {
642 case NGM_CISCO_GET_IPADDR: /* we understand this too */
643 {
644 struct ifaddr *ifa;
645
646 /* Return the first configured IP address */
647 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
648 struct ng_cisco_ipaddr *ips;
649
650 if (ifa->ifa_addr->sa_family != AF_INET)
651 continue;
652 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
653 if (resp == NULL) {
654 error = ENOMEM;
655 break;
656 }
657 ips = (struct ng_cisco_ipaddr *)resp->data;
658 ips->ipaddr = ((struct sockaddr_in *)
659 ifa->ifa_addr)->sin_addr;
660 ips->netmask = ((struct sockaddr_in *)
661 ifa->ifa_netmask)->sin_addr;
662 break;
663 }
664
665 /* No IP addresses on this interface? */
666 if (ifa == NULL)
667 error = EADDRNOTAVAIL;
668 break;
669 }
670 default:
671 error = EINVAL;
672 break;
673 }
674 break;
675 case NGM_FLOW_COOKIE:
676 switch (msg->header.cmd) {
677 case NGM_LINK_IS_UP:
678 ifp->if_drv_flags |= IFF_DRV_RUNNING;
679 break;
680 case NGM_LINK_IS_DOWN:
681 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
682 break;
683 default:
684 break;
685 }
686 break;
687 default:
688 error = EINVAL;
689 break;
690 }
691 NG_RESPOND_MSG(error, node, item, resp);
692 NG_FREE_MSG(msg);
693 return (error);
694 }
695
696 /*
697 * Recive data from a hook. Pass the packet to the correct input routine.
698 */
699 static int
700 ng_iface_rcvdata(hook_p hook, item_p item)
701 {
702 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
703 const iffam_p iffam = get_iffam_from_hook(priv, hook);
704 struct ifnet *const ifp = priv->ifp;
705 struct mbuf *m;
706 int isr;
707
708 NGI_GET_M(item, m);
709 NG_FREE_ITEM(item);
710 /* Sanity checks */
711 KASSERT(iffam != NULL, ("%s: iffam", __func__));
712 M_ASSERTPKTHDR(m);
713 if ((ifp->if_flags & IFF_UP) == 0) {
714 NG_FREE_M(m);
715 return (ENETDOWN);
716 }
717
718 /* Update interface stats */
719 ifp->if_ipackets++;
720 ifp->if_ibytes += m->m_pkthdr.len;
721
722 /* Note receiving interface */
723 m->m_pkthdr.rcvif = ifp;
724
725 /* Berkeley packet filter */
726 ng_iface_bpftap(ifp, m, iffam->family);
727
728 /* Send packet */
729 switch (iffam->family) {
730 #ifdef INET
731 case AF_INET:
732 isr = NETISR_IP;
733 break;
734 #endif
735 #ifdef INET6
736 case AF_INET6:
737 isr = NETISR_IPV6;
738 break;
739 #endif
740 #ifdef IPX
741 case AF_IPX:
742 isr = NETISR_IPX;
743 break;
744 #endif
745 #ifdef NETATALK
746 case AF_APPLETALK:
747 isr = NETISR_ATALK2;
748 break;
749 #endif
750 default:
751 m_freem(m);
752 return (EAFNOSUPPORT);
753 }
754 /* First chunk of an mbuf contains good junk */
755 if (harvest.point_to_point)
756 random_harvest(m, 16, 3, 0, RANDOM_NET);
757 netisr_dispatch(isr, m);
758 return (0);
759 }
760
761 /*
762 * Shutdown and remove the node and its associated interface.
763 */
764 static int
765 ng_iface_shutdown(node_p node)
766 {
767 const priv_p priv = NG_NODE_PRIVATE(node);
768
769 bpfdetach(priv->ifp);
770 if_detach(priv->ifp);
771 if_free(priv->ifp);
772 priv->ifp = NULL;
773 free_unr(ng_iface_unit, priv->unit);
774 FREE(priv, M_NETGRAPH_IFACE);
775 NG_NODE_SET_PRIVATE(node, NULL);
776 NG_NODE_UNREF(node);
777 return (0);
778 }
779
780 /*
781 * Hook disconnection. Note that we do *not* shutdown when all
782 * hooks have been disconnected.
783 */
784 static int
785 ng_iface_disconnect(hook_p hook)
786 {
787 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
788 const iffam_p iffam = get_iffam_from_hook(priv, hook);
789
790 if (iffam == NULL)
791 panic(__func__);
792 *get_hook_from_iffam(priv, iffam) = NULL;
793 return (0);
794 }
795
796 /*
797 * Handle loading and unloading for this node type.
798 */
799 static int
800 ng_iface_mod_event(module_t mod, int event, void *data)
801 {
802 int error = 0;
803
804 switch (event) {
805 case MOD_LOAD:
806 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
807 break;
808 case MOD_UNLOAD:
809 delete_unrhdr(ng_iface_unit);
810 break;
811 default:
812 error = EOPNOTSUPP;
813 break;
814 }
815 return (error);
816 }
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