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/6.1/sys/netgraph/ng_eiface.c 155658 2006-02-14 06:21:47Z ru $
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/errno.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/mbuf.h>
37 #include <sys/errno.h>
38 #include <sys/sockio.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
41
42 #include <net/if.h>
43 #include <net/if_types.h>
44 #include <net/netisr.h>
45
46 #include <netgraph/ng_message.h>
47 #include <netgraph/netgraph.h>
48 #include <netgraph/ng_parse.h>
49 #include <netgraph/ng_eiface.h>
50
51 #include <net/bpf.h>
52 #include <net/ethernet.h>
53 #include <net/if_arp.h>
54
55 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
56 {
57 NGM_EIFACE_COOKIE,
58 NGM_EIFACE_GET_IFNAME,
59 "getifname",
60 NULL,
61 &ng_parse_string_type
62 },
63 {
64 NGM_EIFACE_COOKIE,
65 NGM_EIFACE_SET,
66 "set",
67 &ng_parse_enaddr_type,
68 NULL
69 },
70 { 0 }
71 };
72
73 /* Node private data */
74 struct ng_eiface_private {
75 struct ifnet *ifp; /* per-interface network data */
76 int unit; /* Interface unit number */
77 node_p node; /* Our netgraph node */
78 hook_p ether; /* Hook for ethernet stream */
79 };
80 typedef struct ng_eiface_private *priv_p;
81
82 /* Interface methods */
83 static void ng_eiface_init(void *xsc);
84 static void ng_eiface_start(struct ifnet *ifp);
85 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
86 #ifdef DEBUG
87 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
88 #endif
89
90 /* Netgraph methods */
91 static int ng_eiface_mod_event(module_t, int, void *);
92 static ng_constructor_t ng_eiface_constructor;
93 static ng_rcvmsg_t ng_eiface_rcvmsg;
94 static ng_shutdown_t ng_eiface_rmnode;
95 static ng_newhook_t ng_eiface_newhook;
96 static ng_rcvdata_t ng_eiface_rcvdata;
97 static ng_disconnect_t ng_eiface_disconnect;
98
99 /* Node type descriptor */
100 static struct ng_type typestruct = {
101 .version = NG_ABI_VERSION,
102 .name = NG_EIFACE_NODE_TYPE,
103 .mod_event = ng_eiface_mod_event,
104 .constructor = ng_eiface_constructor,
105 .rcvmsg = ng_eiface_rcvmsg,
106 .shutdown = ng_eiface_rmnode,
107 .newhook = ng_eiface_newhook,
108 .rcvdata = ng_eiface_rcvdata,
109 .disconnect = ng_eiface_disconnect,
110 .cmdlist = ng_eiface_cmdlist
111 };
112 NETGRAPH_INIT(eiface, &typestruct);
113
114 static struct unrhdr *ng_eiface_unit;
115
116 /************************************************************************
117 INTERFACE STUFF
118 ************************************************************************/
119
120 /*
121 * Process an ioctl for the virtual interface
122 */
123 static int
124 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
125 {
126 struct ifreq *const ifr = (struct ifreq *)data;
127 int s, error = 0;
128
129 #ifdef DEBUG
130 ng_eiface_print_ioctl(ifp, command, data);
131 #endif
132 s = splimp();
133 switch (command) {
134
135 /* These two are mostly handled at a higher layer */
136 case SIOCSIFADDR:
137 error = ether_ioctl(ifp, command, data);
138 break;
139 case SIOCGIFADDR:
140 break;
141
142 /* Set flags */
143 case SIOCSIFFLAGS:
144 /*
145 * If the interface is marked up and stopped, then start it.
146 * If it is marked down and running, then stop it.
147 */
148 if (ifr->ifr_flags & IFF_UP) {
149 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
150 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
151 ifp->if_drv_flags |= IFF_DRV_RUNNING;
152 }
153 } else {
154 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
155 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
156 IFF_DRV_OACTIVE);
157 }
158 break;
159
160 /* Set the interface MTU */
161 case SIOCSIFMTU:
162 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
163 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
164 error = EINVAL;
165 else
166 ifp->if_mtu = ifr->ifr_mtu;
167 break;
168
169 /* Stuff that's not supported */
170 case SIOCADDMULTI:
171 case SIOCDELMULTI:
172 error = 0;
173 break;
174 case SIOCSIFPHYS:
175 error = EOPNOTSUPP;
176 break;
177
178 default:
179 error = EINVAL;
180 break;
181 }
182 splx(s);
183 return (error);
184 }
185
186 static void
187 ng_eiface_init(void *xsc)
188 {
189 priv_p sc = xsc;
190 struct ifnet *ifp = sc->ifp;
191 int s;
192
193 s = splimp();
194
195 ifp->if_drv_flags |= IFF_DRV_RUNNING;
196 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
197
198 splx(s);
199 }
200
201 /*
202 * We simply relay the packet to the "ether" hook, if it is connected.
203 * We have been through the netgraph locking and are guaranteed to
204 * be the only code running in this node at this time.
205 */
206 static void
207 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
208 {
209 struct ifnet *ifp = arg1;
210 const priv_p priv = (priv_p)ifp->if_softc;
211 int error = 0;
212 struct mbuf *m;
213
214 /* Check interface flags */
215
216 if (!((ifp->if_flags & IFF_UP) &&
217 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
218 return;
219
220 for (;;) {
221 /*
222 * Grab a packet to transmit.
223 */
224 IF_DEQUEUE(&ifp->if_snd, m);
225
226 /* If there's nothing to send, break. */
227 if (m == NULL)
228 break;
229
230 /*
231 * Berkeley packet filter.
232 * Pass packet to bpf if there is a listener.
233 * XXX is this safe? locking?
234 */
235 BPF_MTAP(ifp, m);
236
237 /*
238 * Send packet; if hook is not connected, mbuf will get
239 * freed.
240 */
241 NG_SEND_DATA_ONLY(error, priv->ether, m);
242
243 /* Update stats */
244 if (error == 0)
245 ifp->if_opackets++;
246 else
247 ifp->if_oerrors++;
248 }
249
250 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
251
252 return;
253 }
254
255 /*
256 * This routine is called to deliver a packet out the interface.
257 * We simply queue the netgraph version to be called when netgraph locking
258 * allows it to happen.
259 * Until we know what the rest of the networking code is doing for
260 * locking, we don't know how we will interact with it.
261 * Take comfort from the fact that the ifnet struct is part of our
262 * private info and can't go away while we are queued.
263 * [Though we don't know it is still there now....]
264 * it is possible we don't gain anything from this because
265 * we would like to get the mbuf and queue it as data
266 * somehow, but we can't and if we did would we solve anything?
267 */
268 static void
269 ng_eiface_start(struct ifnet *ifp)
270 {
271
272 const priv_p priv = (priv_p)ifp->if_softc;
273
274 /* Don't do anything if output is active */
275 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
276 return;
277
278 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
279
280 ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
281 }
282
283 #ifdef DEBUG
284 /*
285 * Display an ioctl to the virtual interface
286 */
287
288 static void
289 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
290 {
291 char *str;
292
293 switch (command & IOC_DIRMASK) {
294 case IOC_VOID:
295 str = "IO";
296 break;
297 case IOC_OUT:
298 str = "IOR";
299 break;
300 case IOC_IN:
301 str = "IOW";
302 break;
303 case IOC_INOUT:
304 str = "IORW";
305 break;
306 default:
307 str = "IO??";
308 }
309 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
310 ifp->if_xname,
311 str,
312 IOCGROUP(command),
313 command & 0xff,
314 IOCPARM_LEN(command));
315 }
316 #endif /* DEBUG */
317
318 /************************************************************************
319 NETGRAPH NODE STUFF
320 ************************************************************************/
321
322 /*
323 * Constructor for a node
324 */
325 static int
326 ng_eiface_constructor(node_p node)
327 {
328 struct ifnet *ifp;
329 priv_p priv;
330 u_char eaddr[6] = {0,0,0,0,0,0};
331
332 /* Allocate node and interface private structures */
333 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
334 if (priv == NULL)
335 return (ENOMEM);
336
337 ifp = priv->ifp = if_alloc(IFT_ETHER);
338 if (ifp == NULL) {
339 free(priv, M_NETGRAPH);
340 return (ENOSPC);
341 }
342
343 /* Link them together */
344 ifp->if_softc = priv;
345
346 /* Get an interface unit number */
347 priv->unit = alloc_unr(ng_eiface_unit);
348
349 /* Link together node and private info */
350 NG_NODE_SET_PRIVATE(node, priv);
351 priv->node = node;
352
353 /* Initialize interface structure */
354 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
355 ifp->if_init = ng_eiface_init;
356 ifp->if_output = ether_output;
357 ifp->if_start = ng_eiface_start;
358 ifp->if_ioctl = ng_eiface_ioctl;
359 ifp->if_watchdog = NULL;
360 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
361 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
362
363 #if 0
364 /* Give this node name */
365 bzero(ifname, sizeof(ifname));
366 sprintf(ifname, "if%s", ifp->if_xname);
367 (void)ng_name_node(node, ifname);
368 #endif
369
370 /* Attach the interface */
371 ether_ifattach(ifp, eaddr);
372
373 /* Done */
374 return (0);
375 }
376
377 /*
378 * Give our ok for a hook to be added
379 */
380 static int
381 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
382 {
383 priv_p priv = NG_NODE_PRIVATE(node);
384 struct ifnet *ifp = priv->ifp;
385
386 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
387 return (EPFNOSUPPORT);
388 if (priv->ether != NULL)
389 return (EISCONN);
390 priv->ether = hook;
391 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
392
393 if_link_state_change(ifp, LINK_STATE_UP);
394
395 return (0);
396 }
397
398 /*
399 * Receive a control message
400 */
401 static int
402 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
403 {
404 const priv_p priv = NG_NODE_PRIVATE(node);
405 struct ifnet *const ifp = priv->ifp;
406 struct ng_mesg *resp = NULL;
407 int error = 0;
408 struct ng_mesg *msg;
409
410 NGI_GET_MSG(item, msg);
411 switch (msg->header.typecookie) {
412 case NGM_EIFACE_COOKIE:
413 switch (msg->header.cmd) {
414
415 case NGM_EIFACE_SET:
416 {
417 if (msg->header.arglen != ETHER_ADDR_LEN) {
418 error = EINVAL;
419 break;
420 }
421 error = if_setlladdr(priv->ifp,
422 (u_char *)msg->data, ETHER_ADDR_LEN);
423 break;
424 }
425
426 case NGM_EIFACE_GET_IFNAME:
427 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
428 if (resp == NULL) {
429 error = ENOMEM;
430 break;
431 }
432 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
433 break;
434
435 case NGM_EIFACE_GET_IFADDRS:
436 {
437 struct ifaddr *ifa;
438 caddr_t ptr;
439 int buflen;
440
441 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
442
443 /* Determine size of response and allocate it */
444 buflen = 0;
445 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
446 buflen += SA_SIZE(ifa->ifa_addr);
447 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
448 if (resp == NULL) {
449 error = ENOMEM;
450 break;
451 }
452
453 /* Add addresses */
454 ptr = resp->data;
455 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
456 const int len = SA_SIZE(ifa->ifa_addr);
457
458 if (buflen < len) {
459 log(LOG_ERR, "%s: len changed?\n",
460 ifp->if_xname);
461 break;
462 }
463 bcopy(ifa->ifa_addr, ptr, len);
464 ptr += len;
465 buflen -= len;
466 }
467 break;
468 #undef SA_SIZE
469 }
470
471 default:
472 error = EINVAL;
473 break;
474 } /* end of inner switch() */
475 break;
476 case NGM_FLOW_COOKIE:
477 switch (msg->header.cmd) {
478 case NGM_LINK_IS_UP:
479 if_link_state_change(ifp, LINK_STATE_UP);
480 break;
481 case NGM_LINK_IS_DOWN:
482 if_link_state_change(ifp, LINK_STATE_DOWN);
483 break;
484 default:
485 break;
486 }
487 break;
488 default:
489 error = EINVAL;
490 break;
491 }
492 NG_RESPOND_MSG(error, node, item, resp);
493 NG_FREE_MSG(msg);
494 return (error);
495 }
496
497 /*
498 * Receive data from a hook. Pass the packet to the ether_input routine.
499 */
500 static int
501 ng_eiface_rcvdata(hook_p hook, item_p item)
502 {
503 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
504 struct ifnet *const ifp = priv->ifp;
505 struct mbuf *m;
506
507 NGI_GET_M(item, m);
508 NG_FREE_ITEM(item);
509
510 if (!((ifp->if_flags & IFF_UP) &&
511 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
512 NG_FREE_M(m);
513 return (ENETDOWN);
514 }
515
516 if (m->m_len < ETHER_HDR_LEN) {
517 m = m_pullup(m, ETHER_HDR_LEN);
518 if (m == NULL)
519 return (EINVAL);
520 }
521
522 /* Note receiving interface */
523 m->m_pkthdr.rcvif = ifp;
524
525 /* Update interface stats */
526 ifp->if_ipackets++;
527
528 (*ifp->if_input)(ifp, m);
529
530 /* Done */
531 return (0);
532 }
533
534 /*
535 * Shutdown processing.
536 */
537 static int
538 ng_eiface_rmnode(node_p node)
539 {
540 const priv_p priv = NG_NODE_PRIVATE(node);
541 struct ifnet *const ifp = priv->ifp;
542
543 ether_ifdetach(ifp);
544 if_free(ifp);
545 free_unr(ng_eiface_unit, priv->unit);
546 FREE(priv, M_NETGRAPH);
547 NG_NODE_SET_PRIVATE(node, NULL);
548 NG_NODE_UNREF(node);
549 return (0);
550 }
551
552 /*
553 * Hook disconnection
554 */
555 static int
556 ng_eiface_disconnect(hook_p hook)
557 {
558 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
559
560 priv->ether = NULL;
561 return (0);
562 }
563
564 /*
565 * Handle loading and unloading for this node type.
566 */
567 static int
568 ng_eiface_mod_event(module_t mod, int event, void *data)
569 {
570 int error = 0;
571
572 switch (event) {
573 case MOD_LOAD:
574 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
575 break;
576 case MOD_UNLOAD:
577 delete_unrhdr(ng_eiface_unit);
578 break;
579 default:
580 error = EOPNOTSUPP;
581 break;
582 }
583 return (error);
584 }
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