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/6.4/sys/netgraph/ng_eiface.c 167446 2007-03-11 10:11:16Z 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 (ifp->if_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 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
281 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
282 }
283
284 #ifdef DEBUG
285 /*
286 * Display an ioctl to the virtual interface
287 */
288
289 static void
290 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
291 {
292 char *str;
293
294 switch (command & IOC_DIRMASK) {
295 case IOC_VOID:
296 str = "IO";
297 break;
298 case IOC_OUT:
299 str = "IOR";
300 break;
301 case IOC_IN:
302 str = "IOW";
303 break;
304 case IOC_INOUT:
305 str = "IORW";
306 break;
307 default:
308 str = "IO??";
309 }
310 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
311 ifp->if_xname,
312 str,
313 IOCGROUP(command),
314 command & 0xff,
315 IOCPARM_LEN(command));
316 }
317 #endif /* DEBUG */
318
319 /************************************************************************
320 NETGRAPH NODE STUFF
321 ************************************************************************/
322
323 /*
324 * Constructor for a node
325 */
326 static int
327 ng_eiface_constructor(node_p node)
328 {
329 struct ifnet *ifp;
330 priv_p priv;
331 u_char eaddr[6] = {0,0,0,0,0,0};
332
333 /* Allocate node and interface private structures */
334 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
335 if (priv == NULL)
336 return (ENOMEM);
337
338 ifp = priv->ifp = if_alloc(IFT_ETHER);
339 if (ifp == NULL) {
340 free(priv, M_NETGRAPH);
341 return (ENOSPC);
342 }
343
344 /* Link them together */
345 ifp->if_softc = priv;
346
347 /* Get an interface unit number */
348 priv->unit = alloc_unr(ng_eiface_unit);
349
350 /* Link together node and private info */
351 NG_NODE_SET_PRIVATE(node, priv);
352 priv->node = node;
353
354 /* Initialize interface structure */
355 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
356 ifp->if_init = ng_eiface_init;
357 ifp->if_output = ether_output;
358 ifp->if_start = ng_eiface_start;
359 ifp->if_ioctl = ng_eiface_ioctl;
360 ifp->if_watchdog = NULL;
361 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
362 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
363
364 #if 0
365 /* Give this node name */
366 bzero(ifname, sizeof(ifname));
367 sprintf(ifname, "if%s", ifp->if_xname);
368 (void)ng_name_node(node, ifname);
369 #endif
370
371 /* Attach the interface */
372 ether_ifattach(ifp, eaddr);
373
374 /* Done */
375 return (0);
376 }
377
378 /*
379 * Give our ok for a hook to be added
380 */
381 static int
382 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
383 {
384 priv_p priv = NG_NODE_PRIVATE(node);
385 struct ifnet *ifp = priv->ifp;
386
387 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
388 return (EPFNOSUPPORT);
389 if (priv->ether != NULL)
390 return (EISCONN);
391 priv->ether = hook;
392 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
393
394 if_link_state_change(ifp, LINK_STATE_UP);
395
396 return (0);
397 }
398
399 /*
400 * Receive a control message
401 */
402 static int
403 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
404 {
405 const priv_p priv = NG_NODE_PRIVATE(node);
406 struct ifnet *const ifp = priv->ifp;
407 struct ng_mesg *resp = NULL;
408 int error = 0;
409 struct ng_mesg *msg;
410
411 NGI_GET_MSG(item, msg);
412 switch (msg->header.typecookie) {
413 case NGM_EIFACE_COOKIE:
414 switch (msg->header.cmd) {
415
416 case NGM_EIFACE_SET:
417 {
418 if (msg->header.arglen != ETHER_ADDR_LEN) {
419 error = EINVAL;
420 break;
421 }
422 error = if_setlladdr(priv->ifp,
423 (u_char *)msg->data, ETHER_ADDR_LEN);
424 break;
425 }
426
427 case NGM_EIFACE_GET_IFNAME:
428 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
429 if (resp == NULL) {
430 error = ENOMEM;
431 break;
432 }
433 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
434 break;
435
436 case NGM_EIFACE_GET_IFADDRS:
437 {
438 struct ifaddr *ifa;
439 caddr_t ptr;
440 int buflen;
441
442 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
443
444 /* Determine size of response and allocate it */
445 buflen = 0;
446 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
447 buflen += SA_SIZE(ifa->ifa_addr);
448 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
449 if (resp == NULL) {
450 error = ENOMEM;
451 break;
452 }
453
454 /* Add addresses */
455 ptr = resp->data;
456 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
457 const int len = SA_SIZE(ifa->ifa_addr);
458
459 if (buflen < len) {
460 log(LOG_ERR, "%s: len changed?\n",
461 ifp->if_xname);
462 break;
463 }
464 bcopy(ifa->ifa_addr, ptr, len);
465 ptr += len;
466 buflen -= len;
467 }
468 break;
469 #undef SA_SIZE
470 }
471
472 default:
473 error = EINVAL;
474 break;
475 } /* end of inner switch() */
476 break;
477 case NGM_FLOW_COOKIE:
478 switch (msg->header.cmd) {
479 case NGM_LINK_IS_UP:
480 if_link_state_change(ifp, LINK_STATE_UP);
481 break;
482 case NGM_LINK_IS_DOWN:
483 if_link_state_change(ifp, LINK_STATE_DOWN);
484 break;
485 default:
486 break;
487 }
488 break;
489 default:
490 error = EINVAL;
491 break;
492 }
493 NG_RESPOND_MSG(error, node, item, resp);
494 NG_FREE_MSG(msg);
495 return (error);
496 }
497
498 /*
499 * Receive data from a hook. Pass the packet to the ether_input routine.
500 */
501 static int
502 ng_eiface_rcvdata(hook_p hook, item_p item)
503 {
504 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
505 struct ifnet *const ifp = priv->ifp;
506 struct mbuf *m;
507
508 NGI_GET_M(item, m);
509 NG_FREE_ITEM(item);
510
511 if (!((ifp->if_flags & IFF_UP) &&
512 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
513 NG_FREE_M(m);
514 return (ENETDOWN);
515 }
516
517 if (m->m_len < ETHER_HDR_LEN) {
518 m = m_pullup(m, ETHER_HDR_LEN);
519 if (m == NULL)
520 return (EINVAL);
521 }
522
523 /* Note receiving interface */
524 m->m_pkthdr.rcvif = ifp;
525
526 /* Update interface stats */
527 ifp->if_ipackets++;
528
529 (*ifp->if_input)(ifp, m);
530
531 /* Done */
532 return (0);
533 }
534
535 /*
536 * Shutdown processing.
537 */
538 static int
539 ng_eiface_rmnode(node_p node)
540 {
541 const priv_p priv = NG_NODE_PRIVATE(node);
542 struct ifnet *const ifp = priv->ifp;
543
544 ether_ifdetach(ifp);
545 if_free(ifp);
546 free_unr(ng_eiface_unit, priv->unit);
547 FREE(priv, M_NETGRAPH);
548 NG_NODE_SET_PRIVATE(node, NULL);
549 NG_NODE_UNREF(node);
550 return (0);
551 }
552
553 /*
554 * Hook disconnection
555 */
556 static int
557 ng_eiface_disconnect(hook_p hook)
558 {
559 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
560
561 priv->ether = NULL;
562 return (0);
563 }
564
565 /*
566 * Handle loading and unloading for this node type.
567 */
568 static int
569 ng_eiface_mod_event(module_t mod, int event, void *data)
570 {
571 int error = 0;
572
573 switch (event) {
574 case MOD_LOAD:
575 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
576 break;
577 case MOD_UNLOAD:
578 delete_unrhdr(ng_eiface_unit);
579 break;
580 default:
581 error = EOPNOTSUPP;
582 break;
583 }
584 return (error);
585 }
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