1 /*-
2 *
3 * Copyright (c) 1999-2001, Vitaly V Belekhov
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
11 * disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/11.2/sys/netgraph/ng_eiface.c 302054 2016-06-21 13:48:49Z bz $
29 */
30
31 #include <sys/param.h>
32 #include <sys/eventhandler.h>
33 #include <sys/systm.h>
34 #include <sys/errno.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mbuf.h>
38 #include <sys/errno.h>
39 #include <sys/proc.h>
40 #include <sys/sockio.h>
41 #include <sys/socket.h>
42 #include <sys/syslog.h>
43
44 #include <net/if.h>
45 #include <net/if_var.h>
46 #include <net/if_media.h>
47 #include <net/if_types.h>
48 #include <net/netisr.h>
49 #include <net/route.h>
50 #include <net/vnet.h>
51
52 #include <netgraph/ng_message.h>
53 #include <netgraph/netgraph.h>
54 #include <netgraph/ng_parse.h>
55 #include <netgraph/ng_eiface.h>
56
57 #include <net/bpf.h>
58 #include <net/ethernet.h>
59 #include <net/if_arp.h>
60
61 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
62 {
63 NGM_EIFACE_COOKIE,
64 NGM_EIFACE_GET_IFNAME,
65 "getifname",
66 NULL,
67 &ng_parse_string_type
68 },
69 {
70 NGM_EIFACE_COOKIE,
71 NGM_EIFACE_SET,
72 "set",
73 &ng_parse_enaddr_type,
74 NULL
75 },
76 { 0 }
77 };
78
79 /* Node private data */
80 struct ng_eiface_private {
81 struct ifnet *ifp; /* per-interface network data */
82 struct ifmedia media; /* (fake) media information */
83 int link_status; /* fake */
84 int unit; /* Interface unit number */
85 node_p node; /* Our netgraph node */
86 hook_p ether; /* Hook for ethernet stream */
87 };
88 typedef struct ng_eiface_private *priv_p;
89
90 /* Interface methods */
91 static void ng_eiface_init(void *xsc);
92 static void ng_eiface_start(struct ifnet *ifp);
93 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
94 #ifdef DEBUG
95 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
96 #endif
97
98 /* Netgraph methods */
99 static int ng_eiface_mod_event(module_t, int, void *);
100 static ng_constructor_t ng_eiface_constructor;
101 static ng_rcvmsg_t ng_eiface_rcvmsg;
102 static ng_shutdown_t ng_eiface_rmnode;
103 static ng_newhook_t ng_eiface_newhook;
104 static ng_rcvdata_t ng_eiface_rcvdata;
105 static ng_disconnect_t ng_eiface_disconnect;
106
107 /* Node type descriptor */
108 static struct ng_type typestruct = {
109 .version = NG_ABI_VERSION,
110 .name = NG_EIFACE_NODE_TYPE,
111 .mod_event = ng_eiface_mod_event,
112 .constructor = ng_eiface_constructor,
113 .rcvmsg = ng_eiface_rcvmsg,
114 .shutdown = ng_eiface_rmnode,
115 .newhook = ng_eiface_newhook,
116 .rcvdata = ng_eiface_rcvdata,
117 .disconnect = ng_eiface_disconnect,
118 .cmdlist = ng_eiface_cmdlist
119 };
120 NETGRAPH_INIT(eiface, &typestruct);
121
122 static VNET_DEFINE(struct unrhdr *, ng_eiface_unit);
123 #define V_ng_eiface_unit VNET(ng_eiface_unit)
124
125 /************************************************************************
126 INTERFACE STUFF
127 ************************************************************************/
128
129 /*
130 * Process an ioctl for the virtual interface
131 */
132 static int
133 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
134 {
135 const priv_p priv = (priv_p)ifp->if_softc;
136 struct ifreq *const ifr = (struct ifreq *)data;
137 int error = 0;
138
139 #ifdef DEBUG
140 ng_eiface_print_ioctl(ifp, command, data);
141 #endif
142 switch (command) {
143
144 /* These two are mostly handled at a higher layer */
145 case SIOCSIFADDR:
146 error = ether_ioctl(ifp, command, data);
147 break;
148 case SIOCGIFADDR:
149 break;
150
151 /* Set flags */
152 case SIOCSIFFLAGS:
153 /*
154 * If the interface is marked up and stopped, then start it.
155 * If it is marked down and running, then stop it.
156 */
157 if (ifp->if_flags & IFF_UP) {
158 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
159 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
160 ifp->if_drv_flags |= IFF_DRV_RUNNING;
161 }
162 } else {
163 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
164 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
165 IFF_DRV_OACTIVE);
166 }
167 break;
168
169 /* Set the interface MTU */
170 case SIOCSIFMTU:
171 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
172 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
173 error = EINVAL;
174 else
175 ifp->if_mtu = ifr->ifr_mtu;
176 break;
177
178 /* (Fake) media type manipulation */
179 case SIOCSIFMEDIA:
180 case SIOCGIFMEDIA:
181 error = ifmedia_ioctl(ifp, ifr, &priv->media, command);
182 break;
183
184 /* Stuff that's not supported */
185 case SIOCADDMULTI:
186 case SIOCDELMULTI:
187 error = 0;
188 break;
189 case SIOCSIFPHYS:
190 error = EOPNOTSUPP;
191 break;
192
193 default:
194 error = EINVAL;
195 break;
196 }
197 return (error);
198 }
199
200 static void
201 ng_eiface_init(void *xsc)
202 {
203 priv_p sc = xsc;
204 struct ifnet *ifp = sc->ifp;
205
206 ifp->if_drv_flags |= IFF_DRV_RUNNING;
207 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
208 }
209
210 /*
211 * We simply relay the packet to the "ether" hook, if it is connected.
212 * We have been through the netgraph locking and are guaranteed to
213 * be the only code running in this node at this time.
214 */
215 static void
216 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
217 {
218 struct ifnet *ifp = arg1;
219 const priv_p priv = (priv_p)ifp->if_softc;
220 int error = 0;
221 struct mbuf *m;
222
223 /* Check interface flags */
224
225 if (!((ifp->if_flags & IFF_UP) &&
226 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
227 return;
228
229 for (;;) {
230 /*
231 * Grab a packet to transmit.
232 */
233 IF_DEQUEUE(&ifp->if_snd, m);
234
235 /* If there's nothing to send, break. */
236 if (m == NULL)
237 break;
238
239 /* Peel the mbuf off any stale tags */
240 m_tag_delete_chain(m, NULL);
241
242 /*
243 * Berkeley packet filter.
244 * Pass packet to bpf if there is a listener.
245 * XXX is this safe? locking?
246 */
247 BPF_MTAP(ifp, m);
248
249 if (ifp->if_flags & IFF_MONITOR) {
250 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
251 m_freem(m);
252 continue;
253 }
254
255 /*
256 * Send packet; if hook is not connected, mbuf will get
257 * freed.
258 */
259 NG_OUTBOUND_THREAD_REF();
260 NG_SEND_DATA_ONLY(error, priv->ether, m);
261 NG_OUTBOUND_THREAD_UNREF();
262
263 /* Update stats */
264 if (error == 0)
265 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
266 else
267 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
268 }
269
270 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
271
272 return;
273 }
274
275 /*
276 * This routine is called to deliver a packet out the interface.
277 * We simply queue the netgraph version to be called when netgraph locking
278 * allows it to happen.
279 * Until we know what the rest of the networking code is doing for
280 * locking, we don't know how we will interact with it.
281 * Take comfort from the fact that the ifnet struct is part of our
282 * private info and can't go away while we are queued.
283 * [Though we don't know it is still there now....]
284 * it is possible we don't gain anything from this because
285 * we would like to get the mbuf and queue it as data
286 * somehow, but we can't and if we did would we solve anything?
287 */
288 static void
289 ng_eiface_start(struct ifnet *ifp)
290 {
291 const priv_p priv = (priv_p)ifp->if_softc;
292
293 /* Don't do anything if output is active */
294 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
295 return;
296
297 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
298
299 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
300 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
301 }
302
303 #ifdef DEBUG
304 /*
305 * Display an ioctl to the virtual interface
306 */
307
308 static void
309 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
310 {
311 char *str;
312
313 switch (command & IOC_DIRMASK) {
314 case IOC_VOID:
315 str = "IO";
316 break;
317 case IOC_OUT:
318 str = "IOR";
319 break;
320 case IOC_IN:
321 str = "IOW";
322 break;
323 case IOC_INOUT:
324 str = "IORW";
325 break;
326 default:
327 str = "IO??";
328 }
329 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
330 ifp->if_xname,
331 str,
332 IOCGROUP(command),
333 command & 0xff,
334 IOCPARM_LEN(command));
335 }
336 #endif /* DEBUG */
337
338 /*
339 * ifmedia stuff
340 */
341 static int
342 ng_eiface_mediachange(struct ifnet *ifp)
343 {
344 const priv_p priv = (priv_p)ifp->if_softc;
345 struct ifmedia *ifm = &priv->media;
346
347 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
348 return (EINVAL);
349 if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
350 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
351 else
352 ifp->if_baudrate = ifmedia_baudrate(ifm->ifm_media);
353
354 return (0);
355 }
356
357 static void
358 ng_eiface_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
359 {
360 const priv_p priv = (priv_p)ifp->if_softc;
361 struct ifmedia *ifm = &priv->media;
362
363 if (ifm->ifm_cur->ifm_media == (IFM_ETHER | IFM_AUTO) &&
364 (priv->link_status & IFM_ACTIVE))
365 ifmr->ifm_active = IFM_ETHER | IFM_1000_T | IFM_FDX;
366 else
367 ifmr->ifm_active = ifm->ifm_cur->ifm_media;
368 ifmr->ifm_status = priv->link_status;
369
370 return;
371 }
372
373 /************************************************************************
374 NETGRAPH NODE STUFF
375 ************************************************************************/
376
377 /*
378 * Constructor for a node
379 */
380 static int
381 ng_eiface_constructor(node_p node)
382 {
383 struct ifnet *ifp;
384 priv_p priv;
385 u_char eaddr[6] = {0,0,0,0,0,0};
386
387 /* Allocate node and interface private structures */
388 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
389
390 ifp = priv->ifp = if_alloc(IFT_ETHER);
391 if (ifp == NULL) {
392 free(priv, M_NETGRAPH);
393 return (ENOSPC);
394 }
395
396 /* Link them together */
397 ifp->if_softc = priv;
398
399 /* Get an interface unit number */
400 priv->unit = alloc_unr(V_ng_eiface_unit);
401
402 /* Link together node and private info */
403 NG_NODE_SET_PRIVATE(node, priv);
404 priv->node = node;
405
406 /* Initialize interface structure */
407 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
408 ifp->if_init = ng_eiface_init;
409 ifp->if_output = ether_output;
410 ifp->if_start = ng_eiface_start;
411 ifp->if_ioctl = ng_eiface_ioctl;
412 ifp->if_snd.ifq_maxlen = ifqmaxlen;
413 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
414 ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
415 ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
416 ifmedia_init(&priv->media, 0, ng_eiface_mediachange,
417 ng_eiface_mediastatus);
418 ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T, 0, NULL);
419 ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
420 ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX, 0, NULL);
421 ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
422 ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T, 0, NULL);
423 ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
424 ifmedia_add(&priv->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL);
425 ifmedia_add(&priv->media, IFM_ETHER | IFM_AUTO, 0, NULL);
426 ifmedia_set(&priv->media, IFM_ETHER | IFM_AUTO);
427 priv->link_status = IFM_AVALID;
428
429 /* Give this node the same name as the interface (if possible) */
430 if (ng_name_node(node, ifp->if_xname) != 0)
431 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
432 ifp->if_xname);
433
434 /* Attach the interface */
435 ether_ifattach(ifp, eaddr);
436 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
437
438 /* Done */
439 return (0);
440 }
441
442 /*
443 * Give our ok for a hook to be added
444 */
445 static int
446 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
447 {
448 priv_p priv = NG_NODE_PRIVATE(node);
449 struct ifnet *ifp = priv->ifp;
450
451 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
452 return (EPFNOSUPPORT);
453 if (priv->ether != NULL)
454 return (EISCONN);
455 priv->ether = hook;
456 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
457 NG_HOOK_SET_TO_INBOUND(hook);
458
459 priv->link_status |= IFM_ACTIVE;
460 CURVNET_SET_QUIET(ifp->if_vnet);
461 if_link_state_change(ifp, LINK_STATE_UP);
462 CURVNET_RESTORE();
463
464 return (0);
465 }
466
467 /*
468 * Receive a control message
469 */
470 static int
471 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
472 {
473 const priv_p priv = NG_NODE_PRIVATE(node);
474 struct ifnet *const ifp = priv->ifp;
475 struct ng_mesg *resp = NULL;
476 int error = 0;
477 struct ng_mesg *msg;
478
479 NGI_GET_MSG(item, msg);
480 switch (msg->header.typecookie) {
481 case NGM_EIFACE_COOKIE:
482 switch (msg->header.cmd) {
483
484 case NGM_EIFACE_SET:
485 {
486 if (msg->header.arglen != ETHER_ADDR_LEN) {
487 error = EINVAL;
488 break;
489 }
490 error = if_setlladdr(priv->ifp,
491 (u_char *)msg->data, ETHER_ADDR_LEN);
492 break;
493 }
494
495 case NGM_EIFACE_GET_IFNAME:
496 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
497 if (resp == NULL) {
498 error = ENOMEM;
499 break;
500 }
501 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
502 break;
503
504 case NGM_EIFACE_GET_IFADDRS:
505 {
506 struct ifaddr *ifa;
507 caddr_t ptr;
508 int buflen;
509
510 /* Determine size of response and allocate it */
511 buflen = 0;
512 if_addr_rlock(ifp);
513 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
514 buflen += SA_SIZE(ifa->ifa_addr);
515 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
516 if (resp == NULL) {
517 if_addr_runlock(ifp);
518 error = ENOMEM;
519 break;
520 }
521
522 /* Add addresses */
523 ptr = resp->data;
524 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
525 const int len = SA_SIZE(ifa->ifa_addr);
526
527 if (buflen < len) {
528 log(LOG_ERR, "%s: len changed?\n",
529 ifp->if_xname);
530 break;
531 }
532 bcopy(ifa->ifa_addr, ptr, len);
533 ptr += len;
534 buflen -= len;
535 }
536 if_addr_runlock(ifp);
537 break;
538 }
539
540 default:
541 error = EINVAL;
542 break;
543 } /* end of inner switch() */
544 break;
545 case NGM_FLOW_COOKIE:
546 CURVNET_SET_QUIET(ifp->if_vnet);
547 switch (msg->header.cmd) {
548 case NGM_LINK_IS_UP:
549 priv->link_status |= IFM_ACTIVE;
550 if_link_state_change(ifp, LINK_STATE_UP);
551 break;
552 case NGM_LINK_IS_DOWN:
553 priv->link_status &= ~IFM_ACTIVE;
554 if_link_state_change(ifp, LINK_STATE_DOWN);
555 break;
556 default:
557 break;
558 }
559 CURVNET_RESTORE();
560 break;
561 default:
562 error = EINVAL;
563 break;
564 }
565 NG_RESPOND_MSG(error, node, item, resp);
566 NG_FREE_MSG(msg);
567 return (error);
568 }
569
570 /*
571 * Receive data from a hook. Pass the packet to the ether_input routine.
572 */
573 static int
574 ng_eiface_rcvdata(hook_p hook, item_p item)
575 {
576 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
577 struct ifnet *const ifp = priv->ifp;
578 struct mbuf *m;
579
580 NGI_GET_M(item, m);
581 NG_FREE_ITEM(item);
582
583 if (!((ifp->if_flags & IFF_UP) &&
584 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
585 NG_FREE_M(m);
586 return (ENETDOWN);
587 }
588
589 if (m->m_len < ETHER_HDR_LEN) {
590 m = m_pullup(m, ETHER_HDR_LEN);
591 if (m == NULL)
592 return (EINVAL);
593 }
594
595 /* Note receiving interface */
596 m->m_pkthdr.rcvif = ifp;
597
598 /* Update interface stats */
599 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
600
601 (*ifp->if_input)(ifp, m);
602
603 /* Done */
604 return (0);
605 }
606
607 /*
608 * Shutdown processing.
609 */
610 static int
611 ng_eiface_rmnode(node_p node)
612 {
613 const priv_p priv = NG_NODE_PRIVATE(node);
614 struct ifnet *const ifp = priv->ifp;
615
616 /*
617 * the ifnet may be in a different vnet than the netgraph node,
618 * hence we have to change the current vnet context here.
619 */
620 CURVNET_SET_QUIET(ifp->if_vnet);
621 ifmedia_removeall(&priv->media);
622 ether_ifdetach(ifp);
623 if_free(ifp);
624 CURVNET_RESTORE();
625 free_unr(V_ng_eiface_unit, priv->unit);
626 free(priv, M_NETGRAPH);
627 NG_NODE_SET_PRIVATE(node, NULL);
628 NG_NODE_UNREF(node);
629 return (0);
630 }
631
632 /*
633 * Hook disconnection
634 */
635 static int
636 ng_eiface_disconnect(hook_p hook)
637 {
638 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
639
640 priv->ether = NULL;
641 priv->link_status &= ~IFM_ACTIVE;
642 CURVNET_SET_QUIET(priv->ifp->if_vnet);
643 if_link_state_change(priv->ifp, LINK_STATE_DOWN);
644 CURVNET_RESTORE();
645 return (0);
646 }
647
648 /*
649 * Handle loading and unloading for this node type.
650 */
651 static int
652 ng_eiface_mod_event(module_t mod, int event, void *data)
653 {
654 int error = 0;
655
656 switch (event) {
657 case MOD_LOAD:
658 case MOD_UNLOAD:
659 break;
660 default:
661 error = EOPNOTSUPP;
662 break;
663 }
664 return (error);
665 }
666
667 static void
668 vnet_ng_eiface_init(const void *unused)
669 {
670
671 V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
672 }
673 VNET_SYSINIT(vnet_ng_eiface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
674 vnet_ng_eiface_init, NULL);
675
676 static void
677 vnet_ng_eiface_uninit(const void *unused)
678 {
679
680 delete_unrhdr(V_ng_eiface_unit);
681 }
682 VNET_SYSUNINIT(vnet_ng_eiface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
683 vnet_ng_eiface_uninit, NULL);
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