1
2 /*
3 * ng_iface.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Archie Cobbs <archie@freebsd.org>
38 *
39 * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.7.2.5 2002/07/02 23:44:02 archie Exp $
40 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
41 */
42
43 /*
44 * This node is also a system networking interface. It has
45 * a hook for each protocol (IP, AppleTalk, etc). Packets
46 * are simply relayed between the interface and the hooks.
47 *
48 * Interfaces are named ng0, ng1, etc. New nodes take the
49 * first available interface name.
50 *
51 * This node also includes Berkeley packet filter support.
52 */
53
54 #include "opt_inet.h"
55 #include "opt_inet6.h"
56
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/errno.h>
60 #include <sys/kernel.h>
61 #include <sys/malloc.h>
62 #include <sys/mbuf.h>
63 #include <sys/sockio.h>
64 #include <sys/socket.h>
65 #include <sys/syslog.h>
66 #include <sys/libkern.h>
67 #include <sys/thread2.h>
68
69 #include <net/if.h>
70 #include <net/if_types.h>
71 #include <net/ifq_var.h>
72 #include <net/netisr.h>
73 #include <net/bpf.h>
74
75 #include <netinet/in.h>
76
77 #include <netgraph/ng_message.h>
78 #include <netgraph/netgraph.h>
79 #include <netgraph/ng_parse.h>
80 #include "ng_iface.h"
81 #include <netgraph/cisco/ng_cisco.h>
82
83 /* This struct describes one address family */
84 struct iffam {
85 sa_family_t family; /* Address family */
86 const char *hookname; /* Name for hook */
87 };
88 typedef const struct iffam *iffam_p;
89
90 /* List of address families supported by our interface */
91 static const struct iffam gFamilies[] = {
92 { AF_INET, NG_IFACE_HOOK_INET },
93 { AF_INET6, NG_IFACE_HOOK_INET6 },
94 { AF_ATM, NG_IFACE_HOOK_ATM },
95 { AF_NATM, NG_IFACE_HOOK_NATM },
96 };
97 #define NUM_FAMILIES NELEM(gFamilies)
98
99 /* Node private data */
100 struct ng_iface_private {
101 struct ifnet *ifp; /* Our interface */
102 int unit; /* Interface unit number */
103 node_p node; /* Our netgraph node */
104 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
105 };
106 typedef struct ng_iface_private *priv_p;
107
108 /* Interface methods */
109 static void ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *);
110 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
111 struct ucred *cr);
112 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
113 struct sockaddr *dst, struct rtentry *rt0);
114 static void ng_iface_bpftap(struct ifnet *ifp,
115 struct mbuf *m, sa_family_t family);
116 #ifdef DEBUG
117 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
118 #endif
119
120 /* Netgraph methods */
121 static ng_constructor_t ng_iface_constructor;
122 static ng_rcvmsg_t ng_iface_rcvmsg;
123 static ng_shutdown_t ng_iface_rmnode;
124 static ng_newhook_t ng_iface_newhook;
125 static ng_rcvdata_t ng_iface_rcvdata;
126 static ng_disconnect_t ng_iface_disconnect;
127
128 /* Helper stuff */
129 static iffam_p get_iffam_from_af(sa_family_t family);
130 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
131 static iffam_p get_iffam_from_name(const char *name);
132 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
133
134 /* Parse type for struct ng_iface_ifname */
135 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = {
136 NG_IFACE_IFACE_NAME_MAX + 1
137 };
138 static const struct ng_parse_type ng_iface_ifname_type = {
139 &ng_parse_fixedstring_type,
140 &ng_iface_ifname_info
141 };
142
143 /* Parse type for struct ng_cisco_ipaddr */
144 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
145 = NG_CISCO_IPADDR_TYPE_INFO;
146 static const struct ng_parse_type ng_cisco_ipaddr_type = {
147 &ng_parse_struct_type,
148 &ng_cisco_ipaddr_type_fields
149 };
150
151 /* List of commands and how to convert arguments to/from ASCII */
152 static const struct ng_cmdlist ng_iface_cmds[] = {
153 {
154 NGM_IFACE_COOKIE,
155 NGM_IFACE_GET_IFNAME,
156 "getifname",
157 NULL,
158 &ng_iface_ifname_type
159 },
160 {
161 NGM_IFACE_COOKIE,
162 NGM_IFACE_POINT2POINT,
163 "point2point",
164 NULL,
165 NULL
166 },
167 {
168 NGM_IFACE_COOKIE,
169 NGM_IFACE_BROADCAST,
170 "broadcast",
171 NULL,
172 NULL
173 },
174 {
175 NGM_CISCO_COOKIE,
176 NGM_CISCO_GET_IPADDR,
177 "getipaddr",
178 NULL,
179 &ng_cisco_ipaddr_type
180 },
181 { 0 }
182 };
183
184 /* Node type descriptor */
185 static struct ng_type typestruct = {
186 NG_VERSION,
187 NG_IFACE_NODE_TYPE,
188 NULL,
189 ng_iface_constructor,
190 ng_iface_rcvmsg,
191 ng_iface_rmnode,
192 ng_iface_newhook,
193 NULL,
194 NULL,
195 ng_iface_rcvdata,
196 ng_iface_rcvdata,
197 ng_iface_disconnect,
198 ng_iface_cmds
199 };
200 NETGRAPH_INIT(iface, &typestruct);
201
202 /* We keep a bitmap indicating which unit numbers are free.
203 One means the unit number is free, zero means it's taken. */
204 static int *ng_iface_units = NULL;
205 static int ng_iface_units_len = 0;
206
207 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY)
208
209 /************************************************************************
210 HELPER STUFF
211 ************************************************************************/
212
213 /*
214 * Get the family descriptor from the family ID
215 */
216 static __inline__ iffam_p
get_iffam_from_af(sa_family_t family)217 get_iffam_from_af(sa_family_t family)
218 {
219 iffam_p iffam;
220 int k;
221
222 for (k = 0; k < NUM_FAMILIES; k++) {
223 iffam = &gFamilies[k];
224 if (iffam->family == family)
225 return (iffam);
226 }
227 return (NULL);
228 }
229
230 /*
231 * Get the family descriptor from the hook
232 */
233 static __inline__ iffam_p
get_iffam_from_hook(priv_p priv,hook_p hook)234 get_iffam_from_hook(priv_p priv, hook_p hook)
235 {
236 int k;
237
238 for (k = 0; k < NUM_FAMILIES; k++)
239 if (priv->hooks[k] == hook)
240 return (&gFamilies[k]);
241 return (NULL);
242 }
243
244 /*
245 * Get the hook from the iffam descriptor
246 */
247
248 static __inline__ hook_p *
get_hook_from_iffam(priv_p priv,iffam_p iffam)249 get_hook_from_iffam(priv_p priv, iffam_p iffam)
250 {
251 return (&priv->hooks[iffam - gFamilies]);
252 }
253
254 /*
255 * Get the iffam descriptor from the name
256 */
257 static __inline__ iffam_p
get_iffam_from_name(const char * name)258 get_iffam_from_name(const char *name)
259 {
260 iffam_p iffam;
261 int k;
262
263 for (k = 0; k < NUM_FAMILIES; k++) {
264 iffam = &gFamilies[k];
265 if (!strcmp(iffam->hookname, name))
266 return (iffam);
267 }
268 return (NULL);
269 }
270
271 /*
272 * Find the first free unit number for a new interface.
273 * Increase the size of the unit bitmap as necessary.
274 */
275 static __inline__ int
ng_iface_get_unit(int * unit)276 ng_iface_get_unit(int *unit)
277 {
278 int index, bit;
279
280 for (index = 0; index < ng_iface_units_len
281 && ng_iface_units[index] == 0; index++);
282 if (index == ng_iface_units_len) { /* extend array */
283 int i, *newarray, newlen;
284
285 newlen = (2 * ng_iface_units_len) + 4;
286 newarray = kmalloc(newlen * sizeof(*ng_iface_units),
287 M_NETGRAPH, M_NOWAIT);
288 if (newarray == NULL)
289 return (ENOMEM);
290 bcopy(ng_iface_units, newarray,
291 ng_iface_units_len * sizeof(*ng_iface_units));
292 for (i = ng_iface_units_len; i < newlen; i++)
293 newarray[i] = ~0;
294 if (ng_iface_units != NULL)
295 kfree(ng_iface_units, M_NETGRAPH);
296 ng_iface_units = newarray;
297 ng_iface_units_len = newlen;
298 }
299 bit = ffs(ng_iface_units[index]) - 1;
300 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
301 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit));
302 ng_iface_units[index] &= ~(1 << bit);
303 *unit = (index * UNITS_BITSPERWORD) + bit;
304 return (0);
305 }
306
307 /*
308 * Free a no longer needed unit number.
309 */
310 static __inline__ void
ng_iface_free_unit(int unit)311 ng_iface_free_unit(int unit)
312 {
313 int index, bit;
314
315 index = unit / UNITS_BITSPERWORD;
316 bit = unit % UNITS_BITSPERWORD;
317 KASSERT(index < ng_iface_units_len,
318 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len));
319 KASSERT((ng_iface_units[index] & (1 << bit)) == 0,
320 ("%s: unit=%d is free", __func__, unit));
321 ng_iface_units[index] |= (1 << bit);
322 /*
323 * XXX We could think about reducing the size of ng_iface_units[]
324 * XXX here if the last portion is all ones
325 */
326 }
327
328 /************************************************************************
329 INTERFACE STUFF
330 ************************************************************************/
331
332 /*
333 * Process an ioctl for the virtual interface
334 */
335 static int
ng_iface_ioctl(struct ifnet * ifp,u_long command,caddr_t data,struct ucred * cr)336 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data,
337 struct ucred *cr)
338 {
339 struct ifreq *const ifr = (struct ifreq *) data;
340 int error = 0;
341
342 #ifdef DEBUG
343 ng_iface_print_ioctl(ifp, command, data);
344 #endif
345 crit_enter();
346 switch (command) {
347
348 /* These two are mostly handled at a higher layer */
349 case SIOCSIFADDR:
350 ifp->if_flags |= (IFF_UP | IFF_RUNNING);
351 ifq_clr_oactive(&ifp->if_snd);
352 break;
353 case SIOCGIFADDR:
354 break;
355
356 /* Set flags */
357 case SIOCSIFFLAGS:
358 /*
359 * If the interface is marked up and stopped, then start it.
360 * If it is marked down and running, then stop it.
361 */
362 if (ifr->ifr_flags & IFF_UP) {
363 if (!(ifp->if_flags & IFF_RUNNING)) {
364 ifq_clr_oactive(&ifp->if_snd);
365 ifp->if_flags |= IFF_RUNNING;
366 }
367 } else {
368 if (ifp->if_flags & IFF_RUNNING) {
369 ifp->if_flags &= ~IFF_RUNNING;
370 ifq_clr_oactive(&ifp->if_snd);
371 }
372 }
373 break;
374
375 /* Set the interface MTU */
376 case SIOCSIFMTU:
377 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
378 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
379 error = EINVAL;
380 else
381 ifp->if_mtu = ifr->ifr_mtu;
382 break;
383
384 /* Stuff that's not supported */
385 case SIOCADDMULTI:
386 case SIOCDELMULTI:
387 error = 0;
388 break;
389 case SIOCSIFPHYS:
390 error = EOPNOTSUPP;
391 break;
392
393 default:
394 error = EINVAL;
395 break;
396 }
397 crit_exit();
398 return (error);
399 }
400
401 /*
402 * This routine is called to deliver a packet out the interface.
403 * We simply look at the address family and relay the packet to
404 * the corresponding hook, if it exists and is connected.
405 */
406
407 static int
ng_iface_output_serialized(struct ifnet * ifp,struct mbuf * m,struct sockaddr * dst,struct rtentry * rt0)408 ng_iface_output_serialized(struct ifnet *ifp, struct mbuf *m,
409 struct sockaddr *dst, struct rtentry *rt0)
410 {
411 const priv_p priv = (priv_p) ifp->if_softc;
412 const iffam_p iffam = get_iffam_from_af(dst->sa_family);
413 meta_p meta = NULL;
414 int len, error = 0;
415
416 /* Check interface flags */
417 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
418 m_freem(m);
419 return (ENETDOWN);
420 }
421
422 /* BPF writes need to be handled specially */
423 if (dst->sa_family == AF_UNSPEC) {
424 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
425 return (ENOBUFS);
426 dst->sa_family = (sa_family_t)*mtod(m, int32_t *);
427 m->m_data += 4;
428 m->m_len -= 4;
429 m->m_pkthdr.len -= 4;
430 }
431
432 /* Berkeley packet filter */
433 ng_iface_bpftap(ifp, m, dst->sa_family);
434
435 /* Check address family to determine hook (if known) */
436 if (iffam == NULL) {
437 m_freem(m);
438 log(LOG_WARNING, "%s: can't handle af%d\n",
439 ifp->if_xname, (int)dst->sa_family);
440 return (EAFNOSUPPORT);
441 }
442
443 /* Copy length before the mbuf gets invalidated */
444 len = m->m_pkthdr.len;
445
446 /* Send packet; if hook is not connected, mbuf will get freed. */
447 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta);
448
449 /* Update stats */
450 if (error == 0) {
451 IFNET_STAT_INC(ifp, obytes, len);
452 IFNET_STAT_INC(ifp, opackets, 1);
453 }
454 return (error);
455 }
456
457 static int
ng_iface_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * dst,struct rtentry * rt0)458 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
459 struct sockaddr *dst, struct rtentry *rt0)
460 {
461 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
462 int error;
463
464 ifsq_serialize_hw(ifsq);
465 error = ng_iface_output_serialized(ifp, m, dst, rt0);
466 ifsq_deserialize_hw(ifsq);
467
468 return error;
469 }
470
471 /*
472 * This routine should never be called
473 */
474
475 static void
ng_iface_start(struct ifnet * ifp,struct ifaltq_subque * ifsq __unused)476 ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
477 {
478 kprintf("%s: %s called?", ifp->if_xname, __func__);
479 }
480
481 /*
482 * Flash a packet by the BPF (requires prepending 4 byte AF header)
483 */
484 static void
ng_iface_bpftap(struct ifnet * ifp,struct mbuf * m,sa_family_t family)485 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
486 {
487 int32_t family4 = (int32_t)family;
488
489 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
490
491 if (ifp->if_bpf) {
492 bpf_gettoken();
493 if (ifp->if_bpf)
494 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4));
495 bpf_reltoken();
496 }
497 }
498
499 #ifdef DEBUG
500 /*
501 * Display an ioctl to the virtual interface
502 */
503
504 static void
ng_iface_print_ioctl(struct ifnet * ifp,int command,caddr_t data)505 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
506 {
507 char *str;
508
509 switch (command & IOC_DIRMASK) {
510 case IOC_VOID:
511 str = "IO";
512 break;
513 case IOC_OUT:
514 str = "IOR";
515 break;
516 case IOC_IN:
517 str = "IOW";
518 break;
519 case IOC_INOUT:
520 str = "IORW";
521 break;
522 default:
523 str = "IO??";
524 }
525 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
526 ifp->if_xname,
527 str,
528 IOCGROUP(command),
529 command & 0xff,
530 IOCPARM_LEN(command));
531 }
532 #endif /* DEBUG */
533
534 /************************************************************************
535 NETGRAPH NODE STUFF
536 ************************************************************************/
537
538 /*
539 * Constructor for a node
540 */
541 static int
ng_iface_constructor(node_p * nodep)542 ng_iface_constructor(node_p *nodep)
543 {
544 char ifname[NG_IFACE_IFACE_NAME_MAX + 1];
545 struct ifnet *ifp;
546 node_p node;
547 priv_p priv;
548 int error = 0;
549
550 /* Allocate node and interface private structures */
551 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
552 if (priv == NULL)
553 return (ENOMEM);
554 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO);
555 if (ifp == NULL) {
556 kfree(priv, M_NETGRAPH);
557 return (ENOMEM);
558 }
559
560 /* Link them together */
561 ifp->if_softc = priv;
562 priv->ifp = ifp;
563
564 /* Get an interface unit number */
565 if ((error = ng_iface_get_unit(&priv->unit)) != 0) {
566 kfree(ifp, M_NETGRAPH);
567 kfree(priv, M_NETGRAPH);
568 return (error);
569 }
570
571 /* Call generic node constructor */
572 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) {
573 ng_iface_free_unit(priv->unit);
574 kfree(ifp, M_NETGRAPH);
575 kfree(priv, M_NETGRAPH);
576 return (error);
577 }
578 node = *nodep;
579
580 /* Link together node and private info */
581 node->private = priv;
582 priv->node = node;
583
584 /* Initialize interface structure */
585 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
586 ifp->if_output = ng_iface_output;
587 ifp->if_start = ng_iface_start;
588 ifp->if_ioctl = ng_iface_ioctl;
589 ifp->if_watchdog = NULL;
590 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
591 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
592 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
593 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
594 ifp->if_addrlen = 0; /* XXX */
595 ifp->if_hdrlen = 0; /* XXX */
596 ifp->if_baudrate = 64000; /* XXX */
597
598 /* Give this node the same name as the interface (if possible) */
599 bzero(ifname, sizeof(ifname));
600 strlcpy(ifname, ifp->if_xname, sizeof(ifname));
601 if (ng_name_node(node, ifname) != 0)
602 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
603
604 /* Attach the interface */
605 if_attach(ifp, NULL);
606 bpfattach(ifp, DLT_NULL, sizeof(uint32_t));
607
608 /* Done */
609 return (0);
610 }
611
612 /*
613 * Give our ok for a hook to be added
614 */
615 static int
ng_iface_newhook(node_p node,hook_p hook,const char * name)616 ng_iface_newhook(node_p node, hook_p hook, const char *name)
617 {
618 const iffam_p iffam = get_iffam_from_name(name);
619 hook_p *hookptr;
620
621 if (iffam == NULL)
622 return (EPFNOSUPPORT);
623 hookptr = get_hook_from_iffam((priv_p) node->private, iffam);
624 if (*hookptr != NULL)
625 return (EISCONN);
626 *hookptr = hook;
627 return (0);
628 }
629
630 /*
631 * Receive a control message
632 */
633 static int
ng_iface_rcvmsg(node_p node,struct ng_mesg * msg,const char * retaddr,struct ng_mesg ** rptr)634 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg,
635 const char *retaddr, struct ng_mesg **rptr)
636 {
637 const priv_p priv = node->private;
638 struct ifnet *const ifp = priv->ifp;
639 struct ng_mesg *resp = NULL;
640 int error = 0;
641
642 switch (msg->header.typecookie) {
643 case NGM_IFACE_COOKIE:
644 switch (msg->header.cmd) {
645 case NGM_IFACE_GET_IFNAME:
646 {
647 struct ng_iface_ifname *arg;
648
649 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
650 if (resp == NULL) {
651 error = ENOMEM;
652 break;
653 }
654 arg = (struct ng_iface_ifname *)resp->data;
655 strlcpy(arg->ngif_name, ifp->if_xname,
656 sizeof(arg->ngif_name));
657 break;
658 }
659
660 case NGM_IFACE_POINT2POINT:
661 case NGM_IFACE_BROADCAST:
662 {
663
664 /* Deny request if interface is UP */
665 if ((ifp->if_flags & IFF_UP) != 0)
666 return (EBUSY);
667
668 /* Change flags */
669 switch (msg->header.cmd) {
670 case NGM_IFACE_POINT2POINT:
671 ifp->if_flags |= IFF_POINTOPOINT;
672 ifp->if_flags &= ~IFF_BROADCAST;
673 break;
674 case NGM_IFACE_BROADCAST:
675 ifp->if_flags &= ~IFF_POINTOPOINT;
676 ifp->if_flags |= IFF_BROADCAST;
677 break;
678 }
679 break;
680 }
681
682 default:
683 error = EINVAL;
684 break;
685 }
686 break;
687 case NGM_CISCO_COOKIE:
688 switch (msg->header.cmd) {
689 case NGM_CISCO_GET_IPADDR: /* we understand this too */
690 {
691 struct ifaddr_container *ifac;
692
693 /* Return the first configured IP address */
694 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
695 ifa_link) {
696 struct ifaddr *ifa = ifac->ifa;
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
714 /* No IP addresses on this interface? */
715 if (ifac == NULL)
716 error = EADDRNOTAVAIL;
717 break;
718 }
719 default:
720 error = EINVAL;
721 break;
722 }
723 break;
724 default:
725 error = EINVAL;
726 break;
727 }
728 if (rptr)
729 *rptr = resp;
730 else if (resp)
731 kfree(resp, M_NETGRAPH);
732 kfree(msg, M_NETGRAPH);
733 return (error);
734 }
735
736 /*
737 * Recive data from a hook. Pass the packet to the correct input routine.
738 */
739 static int
ng_iface_rcvdata(hook_p hook,struct mbuf * m,meta_p meta)740 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
741 {
742 const priv_p priv = hook->node->private;
743 const iffam_p iffam = get_iffam_from_hook(priv, hook);
744 struct ifnet *const ifp = priv->ifp;
745 int isr;
746
747 /* Sanity checks */
748 KASSERT(iffam != NULL, ("%s: iffam", __func__));
749 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
750 if (m == NULL)
751 return (EINVAL);
752 if ((ifp->if_flags & IFF_UP) == 0) {
753 NG_FREE_DATA(m, meta);
754 return (ENETDOWN);
755 }
756
757 /* Update interface stats */
758 IFNET_STAT_INC(ifp, ipackets, 1);
759 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);
760
761 /* Note receiving interface */
762 m->m_pkthdr.rcvif = ifp;
763
764 /* Berkeley packet filter */
765 ng_iface_bpftap(ifp, m, iffam->family);
766
767 /* Ignore any meta-data */
768 NG_FREE_META(meta);
769
770 /* Send packet */
771 switch (iffam->family) {
772 #ifdef INET
773 case AF_INET:
774 isr = NETISR_IP;
775 break;
776 #endif
777 #ifdef INET6
778 case AF_INET6:
779 isr = NETISR_IPV6;
780 break;
781 #endif
782 default:
783 m_freem(m);
784 return (EAFNOSUPPORT);
785 }
786 netisr_queue(isr, m);
787 return (0);
788 }
789
790 /*
791 * Shutdown and remove the node and its associated interface.
792 */
793 static int
ng_iface_rmnode(node_p node)794 ng_iface_rmnode(node_p node)
795 {
796 const priv_p priv = node->private;
797
798 ng_cutlinks(node);
799 ng_unname(node);
800 bpfdetach(priv->ifp);
801 if_detach(priv->ifp);
802 kfree(priv->ifp, M_NETGRAPH);
803 priv->ifp = NULL;
804 ng_iface_free_unit(priv->unit);
805 kfree(priv, M_NETGRAPH);
806 node->private = NULL;
807 ng_unref(node);
808 return (0);
809 }
810
811 /*
812 * Hook disconnection. Note that we do *not* shutdown when all
813 * hooks have been disconnected.
814 */
815 static int
ng_iface_disconnect(hook_p hook)816 ng_iface_disconnect(hook_p hook)
817 {
818 const priv_p priv = hook->node->private;
819 const iffam_p iffam = get_iffam_from_hook(priv, hook);
820
821 if (iffam == NULL)
822 panic(__func__);
823 *get_hook_from_iffam(priv, iffam) = NULL;
824 return (0);
825 }
826
827