kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.
[dragonfly.git] / sys / netgraph7 / ng_iface.c
CommitLineData
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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 1.48 2008/01/31 08:51:48 mav 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
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55#include "opt_inet.h"
56#include "opt_inet6.h"
57#include "opt_ipx.h"
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/errno.h>
62#include <sys/kernel.h>
63#include <sys/malloc.h>
64#include <sys/mbuf.h>
65#include <sys/errno.h>
66#include <sys/random.h>
67#include <sys/sockio.h>
68#include <sys/socket.h>
69#include <sys/syslog.h>
70#include <sys/libkern.h>
71
72#include <net/if.h>
73#include <net/if_types.h>
74#include <net/bpf.h>
75#include <net/netisr.h>
76
77#include <netinet/in.h>
78
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79#include "ng_message.h"
80#include "netgraph.h"
81#include "ng_parse.h"
82#include "ng_iface.h"
83#include "ng_cisco.h"
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84
85#ifdef NG_SEPARATE_MALLOC
86MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
87#else
88#define M_NETGRAPH_IFACE M_NETGRAPH
89#endif
90
91/* This struct describes one address family */
92struct iffam {
93 sa_family_t family; /* Address family */
94 const char *hookname; /* Name for hook */
95};
96typedef const struct iffam *iffam_p;
97
98/* List of address families supported by our interface */
99const static struct iffam gFamilies[] = {
100 { AF_INET, NG_IFACE_HOOK_INET },
101 { AF_INET6, NG_IFACE_HOOK_INET6 },
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102 { AF_IPX, NG_IFACE_HOOK_IPX },
103 { AF_ATM, NG_IFACE_HOOK_ATM },
104 { AF_NATM, NG_IFACE_HOOK_NATM },
105};
b370aff7 106#define NUM_FAMILIES NELEM(gFamilies)
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107
108/* Node private data */
109struct ng_iface_private {
110 struct ifnet *ifp; /* Our interface */
111 int unit; /* Interface unit number */
112 node_p node; /* Our netgraph node */
113 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
114};
115typedef struct ng_iface_private *priv_p;
116
117/* Interface methods */
118static void ng_iface_start(struct ifnet *ifp);
119static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
120static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
121 struct sockaddr *dst, struct rtentry *rt0);
122static void ng_iface_bpftap(struct ifnet *ifp,
123 struct mbuf *m, sa_family_t family);
124static int ng_iface_send(struct ifnet *ifp, struct mbuf *m,
125 sa_family_t sa);
126#ifdef DEBUG
127static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
128#endif
129
130/* Netgraph methods */
131static int ng_iface_mod_event(module_t, int, void *);
132static ng_constructor_t ng_iface_constructor;
133static ng_rcvmsg_t ng_iface_rcvmsg;
134static ng_shutdown_t ng_iface_shutdown;
135static ng_newhook_t ng_iface_newhook;
136static ng_rcvdata_t ng_iface_rcvdata;
137static ng_disconnect_t ng_iface_disconnect;
138
139/* Helper stuff */
140static iffam_p get_iffam_from_af(sa_family_t family);
141static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
142static iffam_p get_iffam_from_name(const char *name);
143static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
144
145/* Parse type for struct ng_cisco_ipaddr */
146static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
147 = NG_CISCO_IPADDR_TYPE_INFO;
148static const struct ng_parse_type ng_cisco_ipaddr_type = {
149 &ng_parse_struct_type,
150 &ng_cisco_ipaddr_type_fields
151};
152
153/* List of commands and how to convert arguments to/from ASCII */
154static const struct ng_cmdlist ng_iface_cmds[] = {
155 {
156 NGM_IFACE_COOKIE,
157 NGM_IFACE_GET_IFNAME,
158 "getifname",
159 NULL,
160 &ng_parse_string_type
161 },
162 {
163 NGM_IFACE_COOKIE,
164 NGM_IFACE_POINT2POINT,
165 "point2point",
166 NULL,
167 NULL
168 },
169 {
170 NGM_IFACE_COOKIE,
171 NGM_IFACE_BROADCAST,
172 "broadcast",
173 NULL,
174 NULL
175 },
176 {
177 NGM_CISCO_COOKIE,
178 NGM_CISCO_GET_IPADDR,
179 "getipaddr",
180 NULL,
181 &ng_cisco_ipaddr_type
182 },
183 {
184 NGM_IFACE_COOKIE,
185 NGM_IFACE_GET_IFINDEX,
186 "getifindex",
187 NULL,
188 &ng_parse_uint32_type
189 },
190 { 0 }
191};
192
193/* Node type descriptor */
194static struct ng_type typestruct = {
195 .version = NG_ABI_VERSION,
196 .name = NG_IFACE_NODE_TYPE,
197 .mod_event = ng_iface_mod_event,
198 .constructor = ng_iface_constructor,
199 .rcvmsg = ng_iface_rcvmsg,
200 .shutdown = ng_iface_shutdown,
201 .newhook = ng_iface_newhook,
202 .rcvdata = ng_iface_rcvdata,
203 .disconnect = ng_iface_disconnect,
204 .cmdlist = ng_iface_cmds,
205};
206NETGRAPH_INIT(iface, &typestruct);
207
208static struct unrhdr *ng_iface_unit;
209
210/************************************************************************
211 HELPER STUFF
212 ************************************************************************/
213
214/*
215 * Get the family descriptor from the family ID
216 */
217static __inline iffam_p
218get_iffam_from_af(sa_family_t family)
219{
220 iffam_p iffam;
221 int k;
222
223 for (k = 0; k < NUM_FAMILIES; k++) {
224 iffam = &gFamilies[k];
225 if (iffam->family == family)
226 return (iffam);
227 }
228 return (NULL);
229}
230
231/*
232 * Get the family descriptor from the hook
233 */
234static __inline iffam_p
235get_iffam_from_hook(priv_p priv, hook_p hook)
236{
237 int k;
238
239 for (k = 0; k < NUM_FAMILIES; k++)
240 if (priv->hooks[k] == hook)
241 return (&gFamilies[k]);
242 return (NULL);
243}
244
245/*
246 * Get the hook from the iffam descriptor
247 */
248
249static __inline hook_p *
250get_hook_from_iffam(priv_p priv, iffam_p iffam)
251{
252 return (&priv->hooks[iffam - gFamilies]);
253}
254
255/*
256 * Get the iffam descriptor from the name
257 */
258static __inline iffam_p
259get_iffam_from_name(const char *name)
260{
261 iffam_p iffam;
262 int k;
263
264 for (k = 0; k < NUM_FAMILIES; k++) {
265 iffam = &gFamilies[k];
266 if (!strcmp(iffam->hookname, name))
267 return (iffam);
268 }
269 return (NULL);
270}
271
272/************************************************************************
273 INTERFACE STUFF
274 ************************************************************************/
275
276/*
277 * Process an ioctl for the virtual interface
278 */
279static int
280ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
281{
282 struct ifreq *const ifr = (struct ifreq *) data;
283 int s, error = 0;
284
285#ifdef DEBUG
286 ng_iface_print_ioctl(ifp, command, data);
287#endif
288 s = splimp();
289 switch (command) {
290
291 /* These two are mostly handled at a higher layer */
292 case SIOCSIFADDR:
293 ifp->if_flags |= IFF_UP;
294 ifp->if_drv_flags |= IFF_DRV_RUNNING;
295 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
296 break;
297 case SIOCGIFADDR:
298 break;
299
300 /* Set flags */
301 case SIOCSIFFLAGS:
302 /*
303 * If the interface is marked up and stopped, then start it.
304 * If it is marked down and running, then stop it.
305 */
306 if (ifr->ifr_flags & IFF_UP) {
307 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
308 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
309 ifp->if_drv_flags |= IFF_DRV_RUNNING;
310 }
311 } else {
312 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
313 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
314 IFF_DRV_OACTIVE);
315 }
316 break;
317
318 /* Set the interface MTU */
319 case SIOCSIFMTU:
320 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
321 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
322 error = EINVAL;
323 else
324 ifp->if_mtu = ifr->ifr_mtu;
325 break;
326
327 /* Stuff that's not supported */
328 case SIOCADDMULTI:
329 case SIOCDELMULTI:
330 error = 0;
331 break;
332 case SIOCSIFPHYS:
333 error = EOPNOTSUPP;
334 break;
335
336 default:
337 error = EINVAL;
338 break;
339 }
340 (void) splx(s);
341 return (error);
342}
343
344/*
345 * This routine is called to deliver a packet out the interface.
346 * We simply look at the address family and relay the packet to
347 * the corresponding hook, if it exists and is connected.
348 */
349
350static int
351ng_iface_output(struct ifnet *ifp, struct mbuf *m,
352 struct sockaddr *dst, struct rtentry *rt0)
353{
354 uint32_t af;
355 int error;
356
357 /* Check interface flags */
358 if (!((ifp->if_flags & IFF_UP) &&
359 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
360 m_freem(m);
361 return (ENETDOWN);
362 }
363
364 /* BPF writes need to be handled specially. */
365 if (dst->sa_family == AF_UNSPEC) {
366 bcopy(dst->sa_data, &af, sizeof(af));
367 dst->sa_family = af;
368 }
369
370 /* Berkeley packet filter */
371 ng_iface_bpftap(ifp, m, dst->sa_family);
372
373 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
5a975a3d 374 M_PREPEND(m, sizeof(sa_family_t), MB_DONTWAIT);
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375 if (m == NULL) {
376 IFQ_LOCK(&ifp->if_snd);
377 IFQ_INC_DROPS(&ifp->if_snd);
378 IFQ_UNLOCK(&ifp->if_snd);
379 ifp->if_oerrors++;
380 return (ENOBUFS);
381 }
382 *(sa_family_t *)m->m_data = dst->sa_family;
383 IFQ_HANDOFF(ifp, m, error);
384 } else
385 error = ng_iface_send(ifp, m, dst->sa_family);
386
387 return (error);
388}
389
390/*
391 * Start method is used only when ALTQ is enabled.
392 */
393static void
394ng_iface_start(struct ifnet *ifp)
395{
396 struct mbuf *m;
397 sa_family_t sa;
398
399 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
400
401 for(;;) {
402 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
403 if (m == NULL)
404 break;
405 sa = *mtod(m, sa_family_t *);
406 m_adj(m, sizeof(sa_family_t));
407 ng_iface_send(ifp, m, sa);
408 }
409}
410
411/*
412 * Flash a packet by the BPF (requires prepending 4 byte AF header)
413 * Note the phoney mbuf; this is OK because BPF treats it read-only.
414 */
415static void
416ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
417{
418 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
419 if (bpf_peers_present(ifp->if_bpf)) {
420 int32_t family4 = (int32_t)family;
421 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
422 }
423}
424
425/*
426 * This routine does actual delivery of the packet into the
427 * netgraph(4). It is called from ng_iface_start() and
428 * ng_iface_output().
429 */
430static int
431ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
432{
433 const priv_p priv = (priv_p) ifp->if_softc;
434 const iffam_p iffam = get_iffam_from_af(sa);
435 int error;
436 int len;
437
438 /* Check address family to determine hook (if known) */
439 if (iffam == NULL) {
440 m_freem(m);
441 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
442 return (EAFNOSUPPORT);
443 }
444
445 /* Copy length before the mbuf gets invalidated. */
446 len = m->m_pkthdr.len;
447
448 /* Send packet. If hook is not connected,
449 mbuf will get freed. */
450 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
451
452 /* Update stats. */
453 if (error == 0) {
454 ifp->if_obytes += len;
455 ifp->if_opackets++;
456 }
457
458 return (error);
459}
460
461#ifdef DEBUG
462/*
463 * Display an ioctl to the virtual interface
464 */
465
466static void
467ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
468{
469 char *str;
470
471 switch (command & IOC_DIRMASK) {
472 case IOC_VOID:
473 str = "IO";
474 break;
475 case IOC_OUT:
476 str = "IOR";
477 break;
478 case IOC_IN:
479 str = "IOW";
480 break;
481 case IOC_INOUT:
482 str = "IORW";
483 break;
484 default:
485 str = "IO??";
486 }
487 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
488 ifp->if_xname,
489 str,
490 IOCGROUP(command),
491 command & 0xff,
492 IOCPARM_LEN(command));
493}
494#endif /* DEBUG */
495
496/************************************************************************
497 NETGRAPH NODE STUFF
498 ************************************************************************/
499
500/*
501 * Constructor for a node
502 */
503static int
504ng_iface_constructor(node_p node)
505{
506 struct ifnet *ifp;
507 priv_p priv;
508
509 /* Allocate node and interface private structures */
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510 priv = kmalloc(sizeof(*priv), M_NETGRAPH_IFACE,
511 M_WAITOK | M_NULLOK | M_ZERO);
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512 if (priv == NULL)
513 return (ENOMEM);
514 ifp = if_alloc(IFT_PROPVIRTUAL);
515 if (ifp == NULL) {
fc025606 516 kfree(priv, M_NETGRAPH_IFACE);
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517 return (ENOMEM);
518 }
519
520 /* Link them together */
521 ifp->if_softc = priv;
522 priv->ifp = ifp;
523
524 /* Get an interface unit number */
525 priv->unit = alloc_unr(ng_iface_unit);
526
527 /* Link together node and private info */
528 NG_NODE_SET_PRIVATE(node, priv);
529 priv->node = node;
530
531 /* Initialize interface structure */
532 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
533 ifp->if_output = ng_iface_output;
534 ifp->if_start = ng_iface_start;
535 ifp->if_ioctl = ng_iface_ioctl;
536 ifp->if_watchdog = NULL;
537 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
538 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
539 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
540 ifp->if_addrlen = 0; /* XXX */
541 ifp->if_hdrlen = 0; /* XXX */
542 ifp->if_baudrate = 64000; /* XXX */
543 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
544 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
545 IFQ_SET_READY(&ifp->if_snd);
546
547 /* Give this node the same name as the interface (if possible) */
548 if (ng_name_node(node, ifp->if_xname) != 0)
549 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
550 ifp->if_xname);
551
552 /* Attach the interface */
553 if_attach(ifp);
554 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
555
556 /* Done */
557 return (0);
558}
559
560/*
561 * Give our ok for a hook to be added
562 */
563static int
564ng_iface_newhook(node_p node, hook_p hook, const char *name)
565{
566 const iffam_p iffam = get_iffam_from_name(name);
567 hook_p *hookptr;
568
569 if (iffam == NULL)
570 return (EPFNOSUPPORT);
571 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
572 if (*hookptr != NULL)
573 return (EISCONN);
574 *hookptr = hook;
575 NG_HOOK_HI_STACK(hook);
576 return (0);
577}
578
579/*
580 * Receive a control message
581 */
582static int
583ng_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:
5a975a3d 596 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
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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:
5a975a3d 627 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK);
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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;
5a975a3d 652 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK);
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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 */
699static int
700ng_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
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745 default:
746 m_freem(m);
747 return (EAFNOSUPPORT);
748 }
749 /* First chunk of an mbuf contains good junk */
750 if (harvest.point_to_point)
751 random_harvest(m, 16, 3, 0, RANDOM_NET);
c3c96e44 752 netisr_queue(isr, m);
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753 return (0);
754}
755
756/*
757 * Shutdown and remove the node and its associated interface.
758 */
759static int
760ng_iface_shutdown(node_p node)
761{
762 const priv_p priv = NG_NODE_PRIVATE(node);
763
764 bpfdetach(priv->ifp);
765 if_detach(priv->ifp);
766 if_free(priv->ifp);
767 priv->ifp = NULL;
768 free_unr(ng_iface_unit, priv->unit);
fc025606 769 kfree(priv, M_NETGRAPH_IFACE);
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770 NG_NODE_SET_PRIVATE(node, NULL);
771 NG_NODE_UNREF(node);
772 return (0);
773}
774
775/*
776 * Hook disconnection. Note that we do *not* shutdown when all
777 * hooks have been disconnected.
778 */
779static int
780ng_iface_disconnect(hook_p hook)
781{
782 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
783 const iffam_p iffam = get_iffam_from_hook(priv, hook);
784
785 if (iffam == NULL)
786 panic(__func__);
787 *get_hook_from_iffam(priv, iffam) = NULL;
788 return (0);
789}
790
791/*
792 * Handle loading and unloading for this node type.
793 */
794static int
795ng_iface_mod_event(module_t mod, int event, void *data)
796{
797 int error = 0;
798
799 switch (event) {
800 case MOD_LOAD:
801 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
802 break;
803 case MOD_UNLOAD:
804 delete_unrhdr(ng_iface_unit);
805 break;
806 default:
807 error = EOPNOTSUPP;
808 break;
809 }
810 return (error);
811}