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/malloc.h>
65 #include <sys/mbuf.h>
66 #include <sys/errno.h>
67 #include <sys/proc.h>
68 #include <sys/random.h>
69 #include <sys/sockio.h>
70 #include <sys/socket.h>
71 #include <sys/syslog.h>
72 #include <sys/libkern.h>
73
74 #include <net/if.h>
75 #include <net/if_types.h>
76 #include <net/bpf.h>
77 #include <net/netisr.h>
78 #include <net/route.h>
79 #include <net/vnet.h>
80
81 #include <netinet/in.h>
82
83 #include <netgraph/ng_message.h>
84 #include <netgraph/netgraph.h>
85 #include <netgraph/ng_parse.h>
86 #include <netgraph/ng_iface.h>
87 #include <netgraph/ng_cisco.h>
88
89 #ifdef NG_SEPARATE_MALLOC
90 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
91 #else
92 #define M_NETGRAPH_IFACE M_NETGRAPH
93 #endif
94
95 /* This struct describes one address family */
96 struct iffam {
97 sa_family_t family; /* Address family */
98 const char *hookname; /* Name for hook */
99 };
100 typedef const struct iffam *iffam_p;
101
102 /* List of address families supported by our interface */
103 const static struct iffam gFamilies[] = {
104 { AF_INET, NG_IFACE_HOOK_INET },
105 { AF_INET6, NG_IFACE_HOOK_INET6 },
106 { AF_APPLETALK, NG_IFACE_HOOK_ATALK },
107 { AF_IPX, NG_IFACE_HOOK_IPX },
108 { AF_ATM, NG_IFACE_HOOK_ATM },
109 { AF_NATM, NG_IFACE_HOOK_NATM },
110 };
111 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
112
113 /* Node private data */
114 struct ng_iface_private {
115 struct ifnet *ifp; /* Our interface */
116 int unit; /* Interface unit number */
117 node_p node; /* Our netgraph node */
118 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
119 };
120 typedef struct ng_iface_private *priv_p;
121
122 /* Interface methods */
123 static void ng_iface_start(struct ifnet *ifp);
124 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
125 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
126 struct sockaddr *dst, struct route *ro);
127 static void ng_iface_bpftap(struct ifnet *ifp,
128 struct mbuf *m, sa_family_t family);
129 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m,
130 sa_family_t sa);
131 #ifdef DEBUG
132 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
133 #endif
134
135 /* Netgraph methods */
136 static int ng_iface_mod_event(module_t, int, void *);
137 static ng_constructor_t ng_iface_constructor;
138 static ng_rcvmsg_t ng_iface_rcvmsg;
139 static ng_shutdown_t ng_iface_shutdown;
140 static ng_newhook_t ng_iface_newhook;
141 static ng_rcvdata_t ng_iface_rcvdata;
142 static ng_disconnect_t ng_iface_disconnect;
143
144 /* Helper stuff */
145 static iffam_p get_iffam_from_af(sa_family_t family);
146 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
147 static iffam_p get_iffam_from_name(const char *name);
148 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
149
150 /* Parse type for struct ng_cisco_ipaddr */
151 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
152 = NG_CISCO_IPADDR_TYPE_INFO;
153 static const struct ng_parse_type ng_cisco_ipaddr_type = {
154 &ng_parse_struct_type,
155 &ng_cisco_ipaddr_type_fields
156 };
157
158 /* List of commands and how to convert arguments to/from ASCII */
159 static const struct ng_cmdlist ng_iface_cmds[] = {
160 {
161 NGM_IFACE_COOKIE,
162 NGM_IFACE_GET_IFNAME,
163 "getifname",
164 NULL,
165 &ng_parse_string_type
166 },
167 {
168 NGM_IFACE_COOKIE,
169 NGM_IFACE_POINT2POINT,
170 "point2point",
171 NULL,
172 NULL
173 },
174 {
175 NGM_IFACE_COOKIE,
176 NGM_IFACE_BROADCAST,
177 "broadcast",
178 NULL,
179 NULL
180 },
181 {
182 NGM_CISCO_COOKIE,
183 NGM_CISCO_GET_IPADDR,
184 "getipaddr",
185 NULL,
186 &ng_cisco_ipaddr_type
187 },
188 {
189 NGM_IFACE_COOKIE,
190 NGM_IFACE_GET_IFINDEX,
191 "getifindex",
192 NULL,
193 &ng_parse_uint32_type
194 },
195 { 0 }
196 };
197
198 /* Node type descriptor */
199 static struct ng_type typestruct = {
200 .version = NG_ABI_VERSION,
201 .name = NG_IFACE_NODE_TYPE,
202 .mod_event = ng_iface_mod_event,
203 .constructor = ng_iface_constructor,
204 .rcvmsg = ng_iface_rcvmsg,
205 .shutdown = ng_iface_shutdown,
206 .newhook = ng_iface_newhook,
207 .rcvdata = ng_iface_rcvdata,
208 .disconnect = ng_iface_disconnect,
209 .cmdlist = ng_iface_cmds,
210 };
211 NETGRAPH_INIT(iface, &typestruct);
212
213 static VNET_DEFINE(struct unrhdr *, ng_iface_unit);
214 #define V_ng_iface_unit VNET(ng_iface_unit)
215
216 /************************************************************************
217 HELPER STUFF
218 ************************************************************************/
219
220 /*
221 * Get the family descriptor from the family ID
222 */
223 static __inline iffam_p
224 get_iffam_from_af(sa_family_t family)
225 {
226 iffam_p iffam;
227 int k;
228
229 for (k = 0; k < NUM_FAMILIES; k++) {
230 iffam = &gFamilies[k];
231 if (iffam->family == family)
232 return (iffam);
233 }
234 return (NULL);
235 }
236
237 /*
238 * Get the family descriptor from the hook
239 */
240 static __inline iffam_p
241 get_iffam_from_hook(priv_p priv, hook_p hook)
242 {
243 int k;
244
245 for (k = 0; k < NUM_FAMILIES; k++)
246 if (priv->hooks[k] == hook)
247 return (&gFamilies[k]);
248 return (NULL);
249 }
250
251 /*
252 * Get the hook from the iffam descriptor
253 */
254
255 static __inline hook_p *
256 get_hook_from_iffam(priv_p priv, iffam_p iffam)
257 {
258 return (&priv->hooks[iffam - gFamilies]);
259 }
260
261 /*
262 * Get the iffam descriptor from the name
263 */
264 static __inline iffam_p
265 get_iffam_from_name(const char *name)
266 {
267 iffam_p iffam;
268 int k;
269
270 for (k = 0; k < NUM_FAMILIES; k++) {
271 iffam = &gFamilies[k];
272 if (!strcmp(iffam->hookname, name))
273 return (iffam);
274 }
275 return (NULL);
276 }
277
278 /************************************************************************
279 INTERFACE STUFF
280 ************************************************************************/
281
282 /*
283 * Process an ioctl for the virtual interface
284 */
285 static int
286 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
287 {
288 struct ifreq *const ifr = (struct ifreq *) data;
289 int error = 0;
290
291 #ifdef DEBUG
292 ng_iface_print_ioctl(ifp, command, data);
293 #endif
294 switch (command) {
295
296 /* These two are mostly handled at a higher layer */
297 case SIOCSIFADDR:
298 ifp->if_flags |= IFF_UP;
299 ifp->if_drv_flags |= IFF_DRV_RUNNING;
300 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
301 break;
302 case SIOCGIFADDR:
303 break;
304
305 /* Set flags */
306 case SIOCSIFFLAGS:
307 /*
308 * If the interface is marked up and stopped, then start it.
309 * If it is marked down and running, then stop it.
310 */
311 if (ifr->ifr_flags & IFF_UP) {
312 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
313 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
314 ifp->if_drv_flags |= IFF_DRV_RUNNING;
315 }
316 } else {
317 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
318 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
319 IFF_DRV_OACTIVE);
320 }
321 break;
322
323 /* Set the interface MTU */
324 case SIOCSIFMTU:
325 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
326 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
327 error = EINVAL;
328 else
329 ifp->if_mtu = ifr->ifr_mtu;
330 break;
331
332 /* Stuff that's not supported */
333 case SIOCADDMULTI:
334 case SIOCDELMULTI:
335 error = 0;
336 break;
337 case SIOCSIFPHYS:
338 error = EOPNOTSUPP;
339 break;
340
341 default:
342 error = EINVAL;
343 break;
344 }
345 return (error);
346 }
347
348 /*
349 * This routine is called to deliver a packet out the interface.
350 * We simply look at the address family and relay the packet to
351 * the corresponding hook, if it exists and is connected.
352 */
353
354 static int
355 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
356 struct sockaddr *dst, struct route *ro)
357 {
358 struct m_tag *mtag;
359 uint32_t af;
360 int error;
361
362 /* Check interface flags */
363 if (!((ifp->if_flags & IFF_UP) &&
364 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
365 m_freem(m);
366 return (ENETDOWN);
367 }
368
369 /* Protect from deadly infinite recursion. */
370 mtag = NULL;
371 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
372 if (*(struct ifnet **)(mtag + 1) == ifp) {
373 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
374 m_freem(m);
375 return (EDEADLK);
376 }
377 }
378 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
379 M_NOWAIT);
380 if (mtag == NULL) {
381 m_freem(m);
382 return (ENOMEM);
383 }
384 *(struct ifnet **)(mtag + 1) = ifp;
385 m_tag_prepend(m, mtag);
386
387 /* BPF writes need to be handled specially. */
388 if (dst->sa_family == AF_UNSPEC) {
389 bcopy(dst->sa_data, &af, sizeof(af));
390 dst->sa_family = af;
391 }
392
393 /* Berkeley packet filter */
394 ng_iface_bpftap(ifp, m, dst->sa_family);
395
396 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
397 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
398 if (m == NULL) {
399 IFQ_LOCK(&ifp->if_snd);
400 IFQ_INC_DROPS(&ifp->if_snd);
401 IFQ_UNLOCK(&ifp->if_snd);
402 ifp->if_oerrors++;
403 return (ENOBUFS);
404 }
405 *(sa_family_t *)m->m_data = dst->sa_family;
406 error = (ifp->if_transmit)(ifp, m);
407 } else
408 error = ng_iface_send(ifp, m, dst->sa_family);
409
410 return (error);
411 }
412
413 /*
414 * Start method is used only when ALTQ is enabled.
415 */
416 static void
417 ng_iface_start(struct ifnet *ifp)
418 {
419 struct mbuf *m;
420 sa_family_t sa;
421
422 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
423
424 for(;;) {
425 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
426 if (m == NULL)
427 break;
428 sa = *mtod(m, sa_family_t *);
429 m_adj(m, sizeof(sa_family_t));
430 ng_iface_send(ifp, m, sa);
431 }
432 }
433
434 /*
435 * Flash a packet by the BPF (requires prepending 4 byte AF header)
436 * Note the phoney mbuf; this is OK because BPF treats it read-only.
437 */
438 static void
439 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
440 {
441 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
442 if (bpf_peers_present(ifp->if_bpf)) {
443 int32_t family4 = (int32_t)family;
444 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
445 }
446 }
447
448 /*
449 * This routine does actual delivery of the packet into the
450 * netgraph(4). It is called from ng_iface_start() and
451 * ng_iface_output().
452 */
453 static int
454 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
455 {
456 const priv_p priv = (priv_p) ifp->if_softc;
457 const iffam_p iffam = get_iffam_from_af(sa);
458 int error;
459 int len;
460
461 /* Check address family to determine hook (if known) */
462 if (iffam == NULL) {
463 m_freem(m);
464 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
465 return (EAFNOSUPPORT);
466 }
467
468 /* Copy length before the mbuf gets invalidated. */
469 len = m->m_pkthdr.len;
470
471 /* Send packet. If hook is not connected, mbuf will get freed. */
472 NG_OUTBOUND_THREAD_REF();
473 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
474 NG_OUTBOUND_THREAD_UNREF();
475
476 /* Update stats. */
477 if (error == 0) {
478 ifp->if_obytes += len;
479 ifp->if_opackets++;
480 }
481
482 return (error);
483 }
484
485 #ifdef DEBUG
486 /*
487 * Display an ioctl to the virtual interface
488 */
489
490 static void
491 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
492 {
493 char *str;
494
495 switch (command & IOC_DIRMASK) {
496 case IOC_VOID:
497 str = "IO";
498 break;
499 case IOC_OUT:
500 str = "IOR";
501 break;
502 case IOC_IN:
503 str = "IOW";
504 break;
505 case IOC_INOUT:
506 str = "IORW";
507 break;
508 default:
509 str = "IO??";
510 }
511 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
512 ifp->if_xname,
513 str,
514 IOCGROUP(command),
515 command & 0xff,
516 IOCPARM_LEN(command));
517 }
518 #endif /* DEBUG */
519
520 /************************************************************************
521 NETGRAPH NODE STUFF
522 ************************************************************************/
523
524 /*
525 * Constructor for a node
526 */
527 static int
528 ng_iface_constructor(node_p node)
529 {
530 struct ifnet *ifp;
531 priv_p priv;
532
533 /* Allocate node and interface private structures */
534 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
535 ifp = if_alloc(IFT_PROPVIRTUAL);
536 if (ifp == NULL) {
537 free(priv, M_NETGRAPH_IFACE);
538 return (ENOMEM);
539 }
540
541 /* Link them together */
542 ifp->if_softc = priv;
543 priv->ifp = ifp;
544
545 /* Get an interface unit number */
546 priv->unit = alloc_unr(V_ng_iface_unit);
547
548 /* Link together node and private info */
549 NG_NODE_SET_PRIVATE(node, priv);
550 priv->node = node;
551
552 /* Initialize interface structure */
553 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
554 ifp->if_output = ng_iface_output;
555 ifp->if_start = ng_iface_start;
556 ifp->if_ioctl = ng_iface_ioctl;
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, ifqmaxlen);
564 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
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 NG_HOOK_SET_TO_INBOUND(hook);
597 return (0);
598 }
599
600 /*
601 * Receive a control message
602 */
603 static int
604 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
605 {
606 const priv_p priv = NG_NODE_PRIVATE(node);
607 struct ifnet *const ifp = priv->ifp;
608 struct ng_mesg *resp = NULL;
609 int error = 0;
610 struct ng_mesg *msg;
611
612 NGI_GET_MSG(item, msg);
613 switch (msg->header.typecookie) {
614 case NGM_IFACE_COOKIE:
615 switch (msg->header.cmd) {
616 case NGM_IFACE_GET_IFNAME:
617 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
618 if (resp == NULL) {
619 error = ENOMEM;
620 break;
621 }
622 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
623 break;
624
625 case NGM_IFACE_POINT2POINT:
626 case NGM_IFACE_BROADCAST:
627 {
628
629 /* Deny request if interface is UP */
630 if ((ifp->if_flags & IFF_UP) != 0)
631 return (EBUSY);
632
633 /* Change flags */
634 switch (msg->header.cmd) {
635 case NGM_IFACE_POINT2POINT:
636 ifp->if_flags |= IFF_POINTOPOINT;
637 ifp->if_flags &= ~IFF_BROADCAST;
638 break;
639 case NGM_IFACE_BROADCAST:
640 ifp->if_flags &= ~IFF_POINTOPOINT;
641 ifp->if_flags |= IFF_BROADCAST;
642 break;
643 }
644 break;
645 }
646
647 case NGM_IFACE_GET_IFINDEX:
648 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
649 if (resp == NULL) {
650 error = ENOMEM;
651 break;
652 }
653 *((uint32_t *)resp->data) = priv->ifp->if_index;
654 break;
655
656 default:
657 error = EINVAL;
658 break;
659 }
660 break;
661 case NGM_CISCO_COOKIE:
662 switch (msg->header.cmd) {
663 case NGM_CISCO_GET_IPADDR: /* we understand this too */
664 {
665 struct ifaddr *ifa;
666
667 /* Return the first configured IP address */
668 if_addr_rlock(ifp);
669 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
670 struct ng_cisco_ipaddr *ips;
671
672 if (ifa->ifa_addr->sa_family != AF_INET)
673 continue;
674 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
675 if (resp == NULL) {
676 error = ENOMEM;
677 break;
678 }
679 ips = (struct ng_cisco_ipaddr *)resp->data;
680 ips->ipaddr = ((struct sockaddr_in *)
681 ifa->ifa_addr)->sin_addr;
682 ips->netmask = ((struct sockaddr_in *)
683 ifa->ifa_netmask)->sin_addr;
684 break;
685 }
686 if_addr_runlock(ifp);
687
688 /* No IP addresses on this interface? */
689 if (ifa == NULL)
690 error = EADDRNOTAVAIL;
691 break;
692 }
693 default:
694 error = EINVAL;
695 break;
696 }
697 break;
698 case NGM_FLOW_COOKIE:
699 switch (msg->header.cmd) {
700 case NGM_LINK_IS_UP:
701 ifp->if_drv_flags |= IFF_DRV_RUNNING;
702 break;
703 case NGM_LINK_IS_DOWN:
704 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
705 break;
706 default:
707 break;
708 }
709 break;
710 default:
711 error = EINVAL;
712 break;
713 }
714 NG_RESPOND_MSG(error, node, item, resp);
715 NG_FREE_MSG(msg);
716 return (error);
717 }
718
719 /*
720 * Recive data from a hook. Pass the packet to the correct input routine.
721 */
722 static int
723 ng_iface_rcvdata(hook_p hook, item_p item)
724 {
725 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
726 const iffam_p iffam = get_iffam_from_hook(priv, hook);
727 struct ifnet *const ifp = priv->ifp;
728 struct mbuf *m;
729 int isr;
730
731 NGI_GET_M(item, m);
732 NG_FREE_ITEM(item);
733 /* Sanity checks */
734 KASSERT(iffam != NULL, ("%s: iffam", __func__));
735 M_ASSERTPKTHDR(m);
736 if ((ifp->if_flags & IFF_UP) == 0) {
737 NG_FREE_M(m);
738 return (ENETDOWN);
739 }
740
741 /* Update interface stats */
742 ifp->if_ipackets++;
743 ifp->if_ibytes += m->m_pkthdr.len;
744
745 /* Note receiving interface */
746 m->m_pkthdr.rcvif = ifp;
747
748 /* Berkeley packet filter */
749 ng_iface_bpftap(ifp, m, iffam->family);
750
751 /* Send packet */
752 switch (iffam->family) {
753 #ifdef INET
754 case AF_INET:
755 isr = NETISR_IP;
756 break;
757 #endif
758 #ifdef INET6
759 case AF_INET6:
760 isr = NETISR_IPV6;
761 break;
762 #endif
763 #ifdef IPX
764 case AF_IPX:
765 isr = NETISR_IPX;
766 break;
767 #endif
768 #ifdef NETATALK
769 case AF_APPLETALK:
770 isr = NETISR_ATALK2;
771 break;
772 #endif
773 default:
774 m_freem(m);
775 return (EAFNOSUPPORT);
776 }
777 /* First chunk of an mbuf contains good junk */
778 if (harvest.point_to_point)
779 random_harvest(m, 16, 3, 0, RANDOM_NET);
780 M_SETFIB(m, ifp->if_fib);
781 netisr_dispatch(isr, m);
782 return (0);
783 }
784
785 /*
786 * Shutdown and remove the node and its associated interface.
787 */
788 static int
789 ng_iface_shutdown(node_p node)
790 {
791 const priv_p priv = NG_NODE_PRIVATE(node);
792
793 /*
794 * The ifnet may be in a different vnet than the netgraph node,
795 * hence we have to change the current vnet context here.
796 */
797 CURVNET_SET_QUIET(priv->ifp->if_vnet);
798 bpfdetach(priv->ifp);
799 if_detach(priv->ifp);
800 if_free(priv->ifp);
801 CURVNET_RESTORE();
802 priv->ifp = NULL;
803 free_unr(V_ng_iface_unit, priv->unit);
804 free(priv, M_NETGRAPH_IFACE);
805 NG_NODE_SET_PRIVATE(node, NULL);
806 NG_NODE_UNREF(node);
807 return (0);
808 }
809
810 /*
811 * Hook disconnection. Note that we do *not* shutdown when all
812 * hooks have been disconnected.
813 */
814 static int
815 ng_iface_disconnect(hook_p hook)
816 {
817 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
818 const iffam_p iffam = get_iffam_from_hook(priv, hook);
819
820 if (iffam == NULL)
821 panic("%s", __func__);
822 *get_hook_from_iffam(priv, iffam) = NULL;
823 return (0);
824 }
825
826 /*
827 * Handle loading and unloading for this node type.
828 */
829 static int
830 ng_iface_mod_event(module_t mod, int event, void *data)
831 {
832 int error = 0;
833
834 switch (event) {
835 case MOD_LOAD:
836 case MOD_UNLOAD:
837 break;
838 default:
839 error = EOPNOTSUPP;
840 break;
841 }
842 return (error);
843 }
844
845 static void
846 vnet_ng_iface_init(const void *unused)
847 {
848
849 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
850 }
851 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
852 vnet_ng_iface_init, NULL);
853
854 static void
855 vnet_ng_iface_uninit(const void *unused)
856 {
857
858 delete_unrhdr(V_ng_iface_unit);
859 }
860 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
861 vnet_ng_iface_uninit, NULL);
Cache object: d7fe0df8f124d2404a23121c8afb1c39
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