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 * $FreeBSD$
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/lock.h>
65 #include <sys/malloc.h>
66 #include <sys/mbuf.h>
67 #include <sys/errno.h>
68 #include <sys/proc.h>
69 #include <sys/random.h>
70 #include <sys/rmlock.h>
71 #include <sys/sockio.h>
72 #include <sys/socket.h>
73 #include <sys/syslog.h>
74 #include <sys/libkern.h>
75
76 #include <net/if.h>
77 #include <net/if_types.h>
78 #include <net/bpf.h>
79 #include <net/netisr.h>
80 #include <net/route.h>
81 #include <net/vnet.h>
82
83 #include <netinet/in.h>
84
85 #include <netgraph/ng_message.h>
86 #include <netgraph/netgraph.h>
87 #include <netgraph/ng_parse.h>
88 #include <netgraph/ng_iface.h>
89 #include <netgraph/ng_cisco.h>
90
91 #ifdef NG_SEPARATE_MALLOC
92 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
93 #else
94 #define M_NETGRAPH_IFACE M_NETGRAPH
95 #endif
96
97 /* This struct describes one address family */
98 struct iffam {
99 sa_family_t family; /* Address family */
100 const char *hookname; /* Name for hook */
101 };
102 typedef const struct iffam *iffam_p;
103
104 /* List of address families supported by our interface */
105 const static struct iffam gFamilies[] = {
106 { AF_INET, NG_IFACE_HOOK_INET },
107 { AF_INET6, NG_IFACE_HOOK_INET6 },
108 { AF_APPLETALK, NG_IFACE_HOOK_ATALK },
109 { AF_IPX, NG_IFACE_HOOK_IPX },
110 { AF_ATM, NG_IFACE_HOOK_ATM },
111 { AF_NATM, NG_IFACE_HOOK_NATM },
112 };
113 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
114
115 /* Node private data */
116 struct ng_iface_private {
117 struct ifnet *ifp; /* Our interface */
118 int unit; /* Interface unit number */
119 node_p node; /* Our netgraph node */
120 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
121 struct rmlock lock; /* Protect private data changes */
122 };
123 typedef struct ng_iface_private *priv_p;
124
125 #define PRIV_RLOCK(priv, t) rm_rlock(&priv->lock, t)
126 #define PRIV_RUNLOCK(priv, t) rm_runlock(&priv->lock, t)
127 #define PRIV_WLOCK(priv) rm_wlock(&priv->lock)
128 #define PRIV_WUNLOCK(priv) rm_wunlock(&priv->lock)
129
130 /* Interface methods */
131 static void ng_iface_start(struct ifnet *ifp);
132 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
133 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
134 const struct sockaddr *dst, struct route *ro);
135 static void ng_iface_bpftap(struct ifnet *ifp,
136 struct mbuf *m, sa_family_t family);
137 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m,
138 sa_family_t sa);
139 #ifdef DEBUG
140 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
141 #endif
142
143 /* Netgraph methods */
144 static int ng_iface_mod_event(module_t, int, void *);
145 static ng_constructor_t ng_iface_constructor;
146 static ng_rcvmsg_t ng_iface_rcvmsg;
147 static ng_shutdown_t ng_iface_shutdown;
148 static ng_newhook_t ng_iface_newhook;
149 static ng_rcvdata_t ng_iface_rcvdata;
150 static ng_disconnect_t ng_iface_disconnect;
151
152 /* Helper stuff */
153 static iffam_p get_iffam_from_af(sa_family_t family);
154 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
155 static iffam_p get_iffam_from_name(const char *name);
156 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
157
158 /* Parse type for struct ng_cisco_ipaddr */
159 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
160 = NG_CISCO_IPADDR_TYPE_INFO;
161 static const struct ng_parse_type ng_cisco_ipaddr_type = {
162 &ng_parse_struct_type,
163 &ng_cisco_ipaddr_type_fields
164 };
165
166 /* List of commands and how to convert arguments to/from ASCII */
167 static const struct ng_cmdlist ng_iface_cmds[] = {
168 {
169 NGM_IFACE_COOKIE,
170 NGM_IFACE_GET_IFNAME,
171 "getifname",
172 NULL,
173 &ng_parse_string_type
174 },
175 {
176 NGM_IFACE_COOKIE,
177 NGM_IFACE_POINT2POINT,
178 "point2point",
179 NULL,
180 NULL
181 },
182 {
183 NGM_IFACE_COOKIE,
184 NGM_IFACE_BROADCAST,
185 "broadcast",
186 NULL,
187 NULL
188 },
189 {
190 NGM_CISCO_COOKIE,
191 NGM_CISCO_GET_IPADDR,
192 "getipaddr",
193 NULL,
194 &ng_cisco_ipaddr_type
195 },
196 {
197 NGM_IFACE_COOKIE,
198 NGM_IFACE_GET_IFINDEX,
199 "getifindex",
200 NULL,
201 &ng_parse_uint32_type
202 },
203 { 0 }
204 };
205
206 /* Node type descriptor */
207 static struct ng_type typestruct = {
208 .version = NG_ABI_VERSION,
209 .name = NG_IFACE_NODE_TYPE,
210 .mod_event = ng_iface_mod_event,
211 .constructor = ng_iface_constructor,
212 .rcvmsg = ng_iface_rcvmsg,
213 .shutdown = ng_iface_shutdown,
214 .newhook = ng_iface_newhook,
215 .rcvdata = ng_iface_rcvdata,
216 .disconnect = ng_iface_disconnect,
217 .cmdlist = ng_iface_cmds,
218 };
219 NETGRAPH_INIT(iface, &typestruct);
220
221 static VNET_DEFINE(struct unrhdr *, ng_iface_unit);
222 #define V_ng_iface_unit VNET(ng_iface_unit)
223
224 /************************************************************************
225 HELPER STUFF
226 ************************************************************************/
227
228 /*
229 * Get the family descriptor from the family ID
230 */
231 static __inline iffam_p
232 get_iffam_from_af(sa_family_t family)
233 {
234 iffam_p iffam;
235 int k;
236
237 for (k = 0; k < NUM_FAMILIES; k++) {
238 iffam = &gFamilies[k];
239 if (iffam->family == family)
240 return (iffam);
241 }
242 return (NULL);
243 }
244
245 /*
246 * Get the family descriptor from the hook
247 */
248 static __inline iffam_p
249 get_iffam_from_hook(priv_p priv, hook_p hook)
250 {
251 int k;
252
253 for (k = 0; k < NUM_FAMILIES; k++)
254 if (priv->hooks[k] == hook)
255 return (&gFamilies[k]);
256 return (NULL);
257 }
258
259 /*
260 * Get the hook from the iffam descriptor
261 */
262
263 static __inline hook_p *
264 get_hook_from_iffam(priv_p priv, iffam_p iffam)
265 {
266 return (&priv->hooks[iffam - gFamilies]);
267 }
268
269 /*
270 * Get the iffam descriptor from the name
271 */
272 static __inline iffam_p
273 get_iffam_from_name(const char *name)
274 {
275 iffam_p iffam;
276 int k;
277
278 for (k = 0; k < NUM_FAMILIES; k++) {
279 iffam = &gFamilies[k];
280 if (!strcmp(iffam->hookname, name))
281 return (iffam);
282 }
283 return (NULL);
284 }
285
286 /************************************************************************
287 INTERFACE STUFF
288 ************************************************************************/
289
290 /*
291 * Process an ioctl for the virtual interface
292 */
293 static int
294 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
295 {
296 struct ifreq *const ifr = (struct ifreq *) data;
297 int error = 0;
298
299 #ifdef DEBUG
300 ng_iface_print_ioctl(ifp, command, data);
301 #endif
302 switch (command) {
303
304 /* These two are mostly handled at a higher layer */
305 case SIOCSIFADDR:
306 ifp->if_flags |= IFF_UP;
307 ifp->if_drv_flags |= IFF_DRV_RUNNING;
308 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
309 break;
310 case SIOCGIFADDR:
311 break;
312
313 /* Set flags */
314 case SIOCSIFFLAGS:
315 /*
316 * If the interface is marked up and stopped, then start it.
317 * If it is marked down and running, then stop it.
318 */
319 if (ifr->ifr_flags & IFF_UP) {
320 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
321 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
322 ifp->if_drv_flags |= IFF_DRV_RUNNING;
323 }
324 } else {
325 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
326 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
327 IFF_DRV_OACTIVE);
328 }
329 break;
330
331 /* Set the interface MTU */
332 case SIOCSIFMTU:
333 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
334 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
335 error = EINVAL;
336 else
337 ifp->if_mtu = ifr->ifr_mtu;
338 break;
339
340 /* Stuff that's not supported */
341 case SIOCADDMULTI:
342 case SIOCDELMULTI:
343 error = 0;
344 break;
345 case SIOCSIFPHYS:
346 error = EOPNOTSUPP;
347 break;
348
349 default:
350 error = EINVAL;
351 break;
352 }
353 return (error);
354 }
355
356 /*
357 * This routine is called to deliver a packet out the interface.
358 * We simply look at the address family and relay the packet to
359 * the corresponding hook, if it exists and is connected.
360 */
361
362 static int
363 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
364 const struct sockaddr *dst, struct route *ro)
365 {
366 struct m_tag *mtag;
367 uint32_t af;
368 int error;
369
370 /* Check interface flags */
371 if (!((ifp->if_flags & IFF_UP) &&
372 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
373 m_freem(m);
374 return (ENETDOWN);
375 }
376
377 /* Protect from deadly infinite recursion. */
378 mtag = NULL;
379 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
380 if (*(struct ifnet **)(mtag + 1) == ifp) {
381 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
382 m_freem(m);
383 return (EDEADLK);
384 }
385 }
386 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
387 M_NOWAIT);
388 if (mtag == NULL) {
389 m_freem(m);
390 return (ENOMEM);
391 }
392 *(struct ifnet **)(mtag + 1) = ifp;
393 m_tag_prepend(m, mtag);
394
395 /* BPF writes need to be handled specially. */
396 if (dst->sa_family == AF_UNSPEC)
397 bcopy(dst->sa_data, &af, sizeof(af));
398 else
399 af = dst->sa_family;
400
401 /* Berkeley packet filter */
402 ng_iface_bpftap(ifp, m, af);
403
404 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
405 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
406 if (m == NULL) {
407 IFQ_LOCK(&ifp->if_snd);
408 IFQ_INC_DROPS(&ifp->if_snd);
409 IFQ_UNLOCK(&ifp->if_snd);
410 ifp->if_oerrors++;
411 return (ENOBUFS);
412 }
413 *(sa_family_t *)m->m_data = af;
414 error = (ifp->if_transmit)(ifp, m);
415 } else
416 error = ng_iface_send(ifp, m, af);
417
418 return (error);
419 }
420
421 /*
422 * Start method is used only when ALTQ is enabled.
423 */
424 static void
425 ng_iface_start(struct ifnet *ifp)
426 {
427 struct mbuf *m;
428 sa_family_t sa;
429
430 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
431
432 for(;;) {
433 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
434 if (m == NULL)
435 break;
436 sa = *mtod(m, sa_family_t *);
437 m_adj(m, sizeof(sa_family_t));
438 ng_iface_send(ifp, m, sa);
439 }
440 }
441
442 /*
443 * Flash a packet by the BPF (requires prepending 4 byte AF header)
444 * Note the phoney mbuf; this is OK because BPF treats it read-only.
445 */
446 static void
447 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
448 {
449 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
450 if (bpf_peers_present(ifp->if_bpf)) {
451 int32_t family4 = (int32_t)family;
452 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
453 }
454 }
455
456 /*
457 * This routine does actual delivery of the packet into the
458 * netgraph(4). It is called from ng_iface_start() and
459 * ng_iface_output().
460 */
461 static int
462 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
463 {
464 struct rm_priotracker priv_tracker;
465 const priv_p priv = (priv_p) ifp->if_softc;
466 const iffam_p iffam = get_iffam_from_af(sa);
467 hook_p hook;
468 int error;
469 int len;
470
471 /* Check address family to determine hook (if known) */
472 if (iffam == NULL) {
473 m_freem(m);
474 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
475 return (EAFNOSUPPORT);
476 }
477
478 /* Copy length before the mbuf gets invalidated. */
479 len = m->m_pkthdr.len;
480
481 PRIV_RLOCK(priv, &priv_tracker);
482 hook = *get_hook_from_iffam(priv, iffam);
483 if (hook == NULL) {
484 NG_FREE_M(m);
485 PRIV_RUNLOCK(priv, &priv_tracker);
486 return ENETDOWN;
487 }
488 NG_HOOK_REF(hook);
489 PRIV_RUNLOCK(priv, &priv_tracker);
490
491 NG_OUTBOUND_THREAD_REF();
492 NG_SEND_DATA_ONLY(error, hook, m);
493 NG_OUTBOUND_THREAD_UNREF();
494 NG_HOOK_UNREF(hook);
495
496 /* Update stats. */
497 if (error == 0) {
498 ifp->if_obytes += len;
499 ifp->if_opackets++;
500 }
501
502 return (error);
503 }
504
505 #ifdef DEBUG
506 /*
507 * Display an ioctl to the virtual interface
508 */
509
510 static void
511 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
512 {
513 char *str;
514
515 switch (command & IOC_DIRMASK) {
516 case IOC_VOID:
517 str = "IO";
518 break;
519 case IOC_OUT:
520 str = "IOR";
521 break;
522 case IOC_IN:
523 str = "IOW";
524 break;
525 case IOC_INOUT:
526 str = "IORW";
527 break;
528 default:
529 str = "IO??";
530 }
531 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
532 ifp->if_xname,
533 str,
534 IOCGROUP(command),
535 command & 0xff,
536 IOCPARM_LEN(command));
537 }
538 #endif /* DEBUG */
539
540 /************************************************************************
541 NETGRAPH NODE STUFF
542 ************************************************************************/
543
544 /*
545 * Constructor for a node
546 */
547 static int
548 ng_iface_constructor(node_p node)
549 {
550 struct ifnet *ifp;
551 priv_p priv;
552
553 /* Allocate node and interface private structures */
554 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
555 ifp = if_alloc(IFT_PROPVIRTUAL);
556 if (ifp == NULL) {
557 free(priv, M_NETGRAPH_IFACE);
558 return (ENOMEM);
559 }
560
561 rm_init(&priv->lock, "ng_iface private rmlock");
562
563 /* Link them together */
564 ifp->if_softc = priv;
565 priv->ifp = ifp;
566
567 /* Get an interface unit number */
568 priv->unit = alloc_unr(V_ng_iface_unit);
569
570 /* Link together node and private info */
571 NG_NODE_SET_PRIVATE(node, priv);
572 priv->node = node;
573
574 /* Initialize interface structure */
575 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
576 ifp->if_output = ng_iface_output;
577 ifp->if_start = ng_iface_start;
578 ifp->if_ioctl = ng_iface_ioctl;
579 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
580 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
581 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
582 ifp->if_addrlen = 0; /* XXX */
583 ifp->if_hdrlen = 0; /* XXX */
584 ifp->if_baudrate = 64000; /* XXX */
585 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
586 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
587 IFQ_SET_READY(&ifp->if_snd);
588
589 /* Give this node the same name as the interface (if possible) */
590 if (ng_name_node(node, ifp->if_xname) != 0)
591 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
592 ifp->if_xname);
593
594 /* Attach the interface */
595 if_attach(ifp);
596 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
597
598 /* Done */
599 return (0);
600 }
601
602 /*
603 * Give our ok for a hook to be added
604 */
605 static int
606 ng_iface_newhook(node_p node, hook_p hook, const char *name)
607 {
608 const iffam_p iffam = get_iffam_from_name(name);
609 const priv_p priv = NG_NODE_PRIVATE(node);
610 hook_p *hookptr;
611
612 if (iffam == NULL)
613 return (EPFNOSUPPORT);
614 PRIV_WLOCK(priv);
615 hookptr = get_hook_from_iffam(priv, iffam);
616 if (*hookptr != NULL) {
617 PRIV_WUNLOCK(priv);
618 return (EISCONN);
619 }
620 *hookptr = hook;
621 NG_HOOK_HI_STACK(hook);
622 NG_HOOK_SET_TO_INBOUND(hook);
623 PRIV_WUNLOCK(priv);
624 return (0);
625 }
626
627 /*
628 * Receive a control message
629 */
630 static int
631 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
632 {
633 const priv_p priv = NG_NODE_PRIVATE(node);
634 struct ifnet *const ifp = priv->ifp;
635 struct ng_mesg *resp = NULL;
636 int error = 0;
637 struct ng_mesg *msg;
638
639 NGI_GET_MSG(item, msg);
640 switch (msg->header.typecookie) {
641 case NGM_IFACE_COOKIE:
642 switch (msg->header.cmd) {
643 case NGM_IFACE_GET_IFNAME:
644 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
645 if (resp == NULL) {
646 error = ENOMEM;
647 break;
648 }
649 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
650 break;
651
652 case NGM_IFACE_POINT2POINT:
653 case NGM_IFACE_BROADCAST:
654 {
655
656 /* Deny request if interface is UP */
657 if ((ifp->if_flags & IFF_UP) != 0)
658 return (EBUSY);
659
660 /* Change flags */
661 switch (msg->header.cmd) {
662 case NGM_IFACE_POINT2POINT:
663 ifp->if_flags |= IFF_POINTOPOINT;
664 ifp->if_flags &= ~IFF_BROADCAST;
665 break;
666 case NGM_IFACE_BROADCAST:
667 ifp->if_flags &= ~IFF_POINTOPOINT;
668 ifp->if_flags |= IFF_BROADCAST;
669 break;
670 }
671 break;
672 }
673
674 case NGM_IFACE_GET_IFINDEX:
675 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
676 if (resp == NULL) {
677 error = ENOMEM;
678 break;
679 }
680 *((uint32_t *)resp->data) = priv->ifp->if_index;
681 break;
682
683 default:
684 error = EINVAL;
685 break;
686 }
687 break;
688 case NGM_CISCO_COOKIE:
689 switch (msg->header.cmd) {
690 case NGM_CISCO_GET_IPADDR: /* we understand this too */
691 {
692 struct ifaddr *ifa;
693
694 /* Return the first configured IP address */
695 if_addr_rlock(ifp);
696 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
697 struct ng_cisco_ipaddr *ips;
698
699 if (ifa->ifa_addr->sa_family != AF_INET)
700 continue;
701 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
702 if (resp == NULL) {
703 error = ENOMEM;
704 break;
705 }
706 ips = (struct ng_cisco_ipaddr *)resp->data;
707 ips->ipaddr = ((struct sockaddr_in *)
708 ifa->ifa_addr)->sin_addr;
709 ips->netmask = ((struct sockaddr_in *)
710 ifa->ifa_netmask)->sin_addr;
711 break;
712 }
713 if_addr_runlock(ifp);
714
715 /* No IP addresses on this interface? */
716 if (ifa == NULL)
717 error = EADDRNOTAVAIL;
718 break;
719 }
720 default:
721 error = EINVAL;
722 break;
723 }
724 break;
725 case NGM_FLOW_COOKIE:
726 switch (msg->header.cmd) {
727 case NGM_LINK_IS_UP:
728 ifp->if_drv_flags |= IFF_DRV_RUNNING;
729 break;
730 case NGM_LINK_IS_DOWN:
731 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
732 break;
733 default:
734 break;
735 }
736 break;
737 default:
738 error = EINVAL;
739 break;
740 }
741 NG_RESPOND_MSG(error, node, item, resp);
742 NG_FREE_MSG(msg);
743 return (error);
744 }
745
746 /*
747 * Recive data from a hook. Pass the packet to the correct input routine.
748 */
749 static int
750 ng_iface_rcvdata(hook_p hook, item_p item)
751 {
752 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
753 const iffam_p iffam = get_iffam_from_hook(priv, hook);
754 struct ifnet *const ifp = priv->ifp;
755 struct mbuf *m;
756 int isr;
757
758 NGI_GET_M(item, m);
759 NG_FREE_ITEM(item);
760 /* Sanity checks */
761 KASSERT(iffam != NULL, ("%s: iffam", __func__));
762 M_ASSERTPKTHDR(m);
763 if ((ifp->if_flags & IFF_UP) == 0) {
764 NG_FREE_M(m);
765 return (ENETDOWN);
766 }
767
768 /* Update interface stats */
769 ifp->if_ipackets++;
770 ifp->if_ibytes += m->m_pkthdr.len;
771
772 /* Note receiving interface */
773 m->m_pkthdr.rcvif = ifp;
774
775 /* Berkeley packet filter */
776 ng_iface_bpftap(ifp, m, iffam->family);
777
778 /* Send packet */
779 switch (iffam->family) {
780 #ifdef INET
781 case AF_INET:
782 isr = NETISR_IP;
783 break;
784 #endif
785 #ifdef INET6
786 case AF_INET6:
787 isr = NETISR_IPV6;
788 break;
789 #endif
790 #ifdef IPX
791 case AF_IPX:
792 isr = NETISR_IPX;
793 break;
794 #endif
795 #ifdef NETATALK
796 case AF_APPLETALK:
797 isr = NETISR_ATALK2;
798 break;
799 #endif
800 default:
801 m_freem(m);
802 return (EAFNOSUPPORT);
803 }
804 if (harvest.point_to_point)
805 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_NG);
806 M_SETFIB(m, ifp->if_fib);
807 netisr_dispatch(isr, m);
808 return (0);
809 }
810
811 /*
812 * Shutdown and remove the node and its associated interface.
813 */
814 static int
815 ng_iface_shutdown(node_p node)
816 {
817 const priv_p priv = NG_NODE_PRIVATE(node);
818
819 /*
820 * The ifnet may be in a different vnet than the netgraph node,
821 * hence we have to change the current vnet context here.
822 */
823 CURVNET_SET_QUIET(priv->ifp->if_vnet);
824 bpfdetach(priv->ifp);
825 if_detach(priv->ifp);
826 if_free(priv->ifp);
827 CURVNET_RESTORE();
828 priv->ifp = NULL;
829 free_unr(V_ng_iface_unit, priv->unit);
830 rm_destroy(&priv->lock);
831 free(priv, M_NETGRAPH_IFACE);
832 NG_NODE_SET_PRIVATE(node, NULL);
833 NG_NODE_UNREF(node);
834 return (0);
835 }
836
837 /*
838 * Hook disconnection. Note that we do *not* shutdown when all
839 * hooks have been disconnected.
840 */
841 static int
842 ng_iface_disconnect(hook_p hook)
843 {
844 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
845 const iffam_p iffam = get_iffam_from_hook(priv, hook);
846
847 if (iffam == NULL)
848 panic("%s", __func__);
849 PRIV_WLOCK(priv);
850 *get_hook_from_iffam(priv, iffam) = NULL;
851 PRIV_WUNLOCK(priv);
852 return (0);
853 }
854
855 /*
856 * Handle loading and unloading for this node type.
857 */
858 static int
859 ng_iface_mod_event(module_t mod, int event, void *data)
860 {
861 int error = 0;
862
863 switch (event) {
864 case MOD_LOAD:
865 case MOD_UNLOAD:
866 break;
867 default:
868 error = EOPNOTSUPP;
869 break;
870 }
871 return (error);
872 }
873
874 static void
875 vnet_ng_iface_init(const void *unused)
876 {
877
878 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
879 }
880 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
881 vnet_ng_iface_init, NULL);
882
883 static void
884 vnet_ng_iface_uninit(const void *unused)
885 {
886
887 delete_unrhdr(V_ng_iface_unit);
888 }
889 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
890 vnet_ng_iface_uninit, NULL);
Cache object: ab58176652dd515840efa00909944e21
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