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/7.3/sys/netgraph/ng_iface.c 195336 2009-07-04 06:00:57Z mav $
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 struct m_tag *mtag;
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 /* Protect from deadly infinite recursion. */
368 mtag = NULL;
369 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
370 if (*(struct ifnet **)(mtag + 1) == ifp) {
371 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
372 m_freem(m);
373 return (EDEADLK);
374 }
375 }
376 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
377 M_NOWAIT);
378 if (mtag == NULL) {
379 m_freem(m);
380 return (ENOMEM);
381 }
382 *(struct ifnet **)(mtag + 1) = ifp;
383 m_tag_prepend(m, mtag);
384
385 /* BPF writes need to be handled specially. */
386 if (dst->sa_family == AF_UNSPEC) {
387 bcopy(dst->sa_data, &af, sizeof(af));
388 dst->sa_family = af;
389 }
390
391 /* Berkeley packet filter */
392 ng_iface_bpftap(ifp, m, dst->sa_family);
393
394 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
395 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
396 if (m == NULL) {
397 IFQ_LOCK(&ifp->if_snd);
398 IFQ_INC_DROPS(&ifp->if_snd);
399 IFQ_UNLOCK(&ifp->if_snd);
400 ifp->if_oerrors++;
401 return (ENOBUFS);
402 }
403 *(sa_family_t *)m->m_data = dst->sa_family;
404 IFQ_HANDOFF(ifp, m, error);
405 } else
406 error = ng_iface_send(ifp, m, dst->sa_family);
407
408 return (error);
409 }
410
411 /*
412 * Start method is used only when ALTQ is enabled.
413 */
414 static void
415 ng_iface_start(struct ifnet *ifp)
416 {
417 struct mbuf *m;
418 sa_family_t sa;
419
420 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
421
422 for(;;) {
423 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
424 if (m == NULL)
425 break;
426 sa = *mtod(m, sa_family_t *);
427 m_adj(m, sizeof(sa_family_t));
428 ng_iface_send(ifp, m, sa);
429 }
430 }
431
432 /*
433 * Flash a packet by the BPF (requires prepending 4 byte AF header)
434 * Note the phoney mbuf; this is OK because BPF treats it read-only.
435 */
436 static void
437 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
438 {
439 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
440 if (bpf_peers_present(ifp->if_bpf)) {
441 int32_t family4 = (int32_t)family;
442 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
443 }
444 }
445
446 /*
447 * This routine does actual delivery of the packet into the
448 * netgraph(4). It is called from ng_iface_start() and
449 * ng_iface_output().
450 */
451 static int
452 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
453 {
454 const priv_p priv = (priv_p) ifp->if_softc;
455 const iffam_p iffam = get_iffam_from_af(sa);
456 int error;
457 int len;
458
459 /* Check address family to determine hook (if known) */
460 if (iffam == NULL) {
461 m_freem(m);
462 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
463 return (EAFNOSUPPORT);
464 }
465
466 /* Copy length before the mbuf gets invalidated. */
467 len = m->m_pkthdr.len;
468
469 /* Send packet. If hook is not connected,
470 mbuf will get freed. */
471 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
472
473 /* Update stats. */
474 if (error == 0) {
475 ifp->if_obytes += len;
476 ifp->if_opackets++;
477 }
478
479 return (error);
480 }
481
482 #ifdef DEBUG
483 /*
484 * Display an ioctl to the virtual interface
485 */
486
487 static void
488 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
489 {
490 char *str;
491
492 switch (command & IOC_DIRMASK) {
493 case IOC_VOID:
494 str = "IO";
495 break;
496 case IOC_OUT:
497 str = "IOR";
498 break;
499 case IOC_IN:
500 str = "IOW";
501 break;
502 case IOC_INOUT:
503 str = "IORW";
504 break;
505 default:
506 str = "IO??";
507 }
508 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
509 ifp->if_xname,
510 str,
511 IOCGROUP(command),
512 command & 0xff,
513 IOCPARM_LEN(command));
514 }
515 #endif /* DEBUG */
516
517 /************************************************************************
518 NETGRAPH NODE STUFF
519 ************************************************************************/
520
521 /*
522 * Constructor for a node
523 */
524 static int
525 ng_iface_constructor(node_p node)
526 {
527 struct ifnet *ifp;
528 priv_p priv;
529
530 /* Allocate node and interface private structures */
531 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
532 if (priv == NULL)
533 return (ENOMEM);
534 ifp = if_alloc(IFT_PROPVIRTUAL);
535 if (ifp == NULL) {
536 FREE(priv, M_NETGRAPH_IFACE);
537 return (ENOMEM);
538 }
539
540 /* Link them together */
541 ifp->if_softc = priv;
542 priv->ifp = ifp;
543
544 /* Get an interface unit number */
545 priv->unit = alloc_unr(ng_iface_unit);
546
547 /* Link together node and private info */
548 NG_NODE_SET_PRIVATE(node, priv);
549 priv->node = node;
550
551 /* Initialize interface structure */
552 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
553 ifp->if_output = ng_iface_output;
554 ifp->if_start = ng_iface_start;
555 ifp->if_ioctl = ng_iface_ioctl;
556 ifp->if_watchdog = NULL;
557 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
558 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
559 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
560 ifp->if_addrlen = 0; /* XXX */
561 ifp->if_hdrlen = 0; /* XXX */
562 ifp->if_baudrate = 64000; /* XXX */
563 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
564 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
565 IFQ_SET_READY(&ifp->if_snd);
566
567 /* Give this node the same name as the interface (if possible) */
568 if (ng_name_node(node, ifp->if_xname) != 0)
569 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
570 ifp->if_xname);
571
572 /* Attach the interface */
573 if_attach(ifp);
574 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
575
576 /* Done */
577 return (0);
578 }
579
580 /*
581 * Give our ok for a hook to be added
582 */
583 static int
584 ng_iface_newhook(node_p node, hook_p hook, const char *name)
585 {
586 const iffam_p iffam = get_iffam_from_name(name);
587 hook_p *hookptr;
588
589 if (iffam == NULL)
590 return (EPFNOSUPPORT);
591 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
592 if (*hookptr != NULL)
593 return (EISCONN);
594 *hookptr = hook;
595 NG_HOOK_HI_STACK(hook);
596 return (0);
597 }
598
599 /*
600 * Receive a control message
601 */
602 static int
603 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
604 {
605 const priv_p priv = NG_NODE_PRIVATE(node);
606 struct ifnet *const ifp = priv->ifp;
607 struct ng_mesg *resp = NULL;
608 int error = 0;
609 struct ng_mesg *msg;
610
611 NGI_GET_MSG(item, msg);
612 switch (msg->header.typecookie) {
613 case NGM_IFACE_COOKIE:
614 switch (msg->header.cmd) {
615 case NGM_IFACE_GET_IFNAME:
616 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
617 if (resp == NULL) {
618 error = ENOMEM;
619 break;
620 }
621 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
622 break;
623
624 case NGM_IFACE_POINT2POINT:
625 case NGM_IFACE_BROADCAST:
626 {
627
628 /* Deny request if interface is UP */
629 if ((ifp->if_flags & IFF_UP) != 0)
630 return (EBUSY);
631
632 /* Change flags */
633 switch (msg->header.cmd) {
634 case NGM_IFACE_POINT2POINT:
635 ifp->if_flags |= IFF_POINTOPOINT;
636 ifp->if_flags &= ~IFF_BROADCAST;
637 break;
638 case NGM_IFACE_BROADCAST:
639 ifp->if_flags &= ~IFF_POINTOPOINT;
640 ifp->if_flags |= IFF_BROADCAST;
641 break;
642 }
643 break;
644 }
645
646 case NGM_IFACE_GET_IFINDEX:
647 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
648 if (resp == NULL) {
649 error = ENOMEM;
650 break;
651 }
652 *((uint32_t *)resp->data) = priv->ifp->if_index;
653 break;
654
655 default:
656 error = EINVAL;
657 break;
658 }
659 break;
660 case NGM_CISCO_COOKIE:
661 switch (msg->header.cmd) {
662 case NGM_CISCO_GET_IPADDR: /* we understand this too */
663 {
664 struct ifaddr *ifa;
665
666 /* Return the first configured IP address */
667 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
668 struct ng_cisco_ipaddr *ips;
669
670 if (ifa->ifa_addr->sa_family != AF_INET)
671 continue;
672 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
673 if (resp == NULL) {
674 error = ENOMEM;
675 break;
676 }
677 ips = (struct ng_cisco_ipaddr *)resp->data;
678 ips->ipaddr = ((struct sockaddr_in *)
679 ifa->ifa_addr)->sin_addr;
680 ips->netmask = ((struct sockaddr_in *)
681 ifa->ifa_netmask)->sin_addr;
682 break;
683 }
684
685 /* No IP addresses on this interface? */
686 if (ifa == NULL)
687 error = EADDRNOTAVAIL;
688 break;
689 }
690 default:
691 error = EINVAL;
692 break;
693 }
694 break;
695 case NGM_FLOW_COOKIE:
696 switch (msg->header.cmd) {
697 case NGM_LINK_IS_UP:
698 ifp->if_drv_flags |= IFF_DRV_RUNNING;
699 break;
700 case NGM_LINK_IS_DOWN:
701 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
702 break;
703 default:
704 break;
705 }
706 break;
707 default:
708 error = EINVAL;
709 break;
710 }
711 NG_RESPOND_MSG(error, node, item, resp);
712 NG_FREE_MSG(msg);
713 return (error);
714 }
715
716 /*
717 * Recive data from a hook. Pass the packet to the correct input routine.
718 */
719 static int
720 ng_iface_rcvdata(hook_p hook, item_p item)
721 {
722 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
723 const iffam_p iffam = get_iffam_from_hook(priv, hook);
724 struct ifnet *const ifp = priv->ifp;
725 struct mbuf *m;
726 int isr;
727
728 NGI_GET_M(item, m);
729 NG_FREE_ITEM(item);
730 /* Sanity checks */
731 KASSERT(iffam != NULL, ("%s: iffam", __func__));
732 M_ASSERTPKTHDR(m);
733 if ((ifp->if_flags & IFF_UP) == 0) {
734 NG_FREE_M(m);
735 return (ENETDOWN);
736 }
737
738 /* Update interface stats */
739 ifp->if_ipackets++;
740 ifp->if_ibytes += m->m_pkthdr.len;
741
742 /* Note receiving interface */
743 m->m_pkthdr.rcvif = ifp;
744
745 /* Berkeley packet filter */
746 ng_iface_bpftap(ifp, m, iffam->family);
747
748 /* Send packet */
749 switch (iffam->family) {
750 #ifdef INET
751 case AF_INET:
752 isr = NETISR_IP;
753 break;
754 #endif
755 #ifdef INET6
756 case AF_INET6:
757 isr = NETISR_IPV6;
758 break;
759 #endif
760 #ifdef IPX
761 case AF_IPX:
762 isr = NETISR_IPX;
763 break;
764 #endif
765 #ifdef NETATALK
766 case AF_APPLETALK:
767 isr = NETISR_ATALK2;
768 break;
769 #endif
770 default:
771 m_freem(m);
772 return (EAFNOSUPPORT);
773 }
774 /* First chunk of an mbuf contains good junk */
775 if (harvest.point_to_point)
776 random_harvest(m, 16, 3, 0, RANDOM_NET);
777 netisr_dispatch(isr, m);
778 return (0);
779 }
780
781 /*
782 * Shutdown and remove the node and its associated interface.
783 */
784 static int
785 ng_iface_shutdown(node_p node)
786 {
787 const priv_p priv = NG_NODE_PRIVATE(node);
788
789 bpfdetach(priv->ifp);
790 if_detach(priv->ifp);
791 if_free(priv->ifp);
792 priv->ifp = NULL;
793 free_unr(ng_iface_unit, priv->unit);
794 FREE(priv, M_NETGRAPH_IFACE);
795 NG_NODE_SET_PRIVATE(node, NULL);
796 NG_NODE_UNREF(node);
797 return (0);
798 }
799
800 /*
801 * Hook disconnection. Note that we do *not* shutdown when all
802 * hooks have been disconnected.
803 */
804 static int
805 ng_iface_disconnect(hook_p hook)
806 {
807 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
808 const iffam_p iffam = get_iffam_from_hook(priv, hook);
809
810 if (iffam == NULL)
811 panic(__func__);
812 *get_hook_from_iffam(priv, iffam) = NULL;
813 return (0);
814 }
815
816 /*
817 * Handle loading and unloading for this node type.
818 */
819 static int
820 ng_iface_mod_event(module_t mod, int event, void *data)
821 {
822 int error = 0;
823
824 switch (event) {
825 case MOD_LOAD:
826 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
827 break;
828 case MOD_UNLOAD:
829 delete_unrhdr(ng_iface_unit);
830 break;
831 default:
832 error = EOPNOTSUPP;
833 break;
834 }
835 return (error);
836 }
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