xref: /dragonfly/sys/netgraph/eiface/ng_eiface.c (revision af79c6e5) 
1 /*
2  * ng_eiface.c
3  *
4  * Copyright (c) 1999-2000, Vitaly V Belekhov
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice unmodified, this list of conditions, and the following
12  *    disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * 	$Id: ng_eiface.c,v 1.14 2000/03/15 12:28:44 vitaly Exp $
30  * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.4.2.5 2002/12/17 21:47:48 julian Exp $
31  * $DragonFly: src/sys/netgraph/eiface/ng_eiface.c,v 1.3 2003/08/07 21:17:31 dillon Exp $
32  */
33 
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/errno.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40 #include <sys/errno.h>
41 #include <sys/sockio.h>
42 #include <sys/socket.h>
43 #include <sys/syslog.h>
44 
45 #include <net/if.h>
46 #include <net/if_types.h>
47 #include <net/netisr.h>
48 
49 
50 #include <netgraph/ng_message.h>
51 #include <netgraph/netgraph.h>
52 #include <netgraph/ng_parse.h>
53 #include "ng_eiface.h"
54 
55 #include <net/bpf.h>
56 #include <net/ethernet.h>
57 #include <net/if_arp.h>
58 
59 static const struct ng_parse_struct_field ng_eiface_par_fields[]
60 	= NG_EIFACE_PAR_FIELDS;
61 
62 static const struct ng_parse_type ng_eiface_par_type = {
63 	&ng_parse_struct_type,
64 	&ng_eiface_par_fields
65 };
66 
67 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
68 	{
69 	  NGM_EIFACE_COOKIE,
70 	  NGM_EIFACE_SET,
71 	  "set",
72 	  &ng_eiface_par_type,
73 	  NULL
74 	},
75 	{ 0 }
76 };
77 
78 /* Node private data */
79 struct ng_eiface_private {
80 	struct arpcom	arpcom;		/* per-interface network data */
81 	struct	ifnet *ifp;		/* This interface */
82 	node_p	node;			/* Our netgraph node */
83 	hook_p	ether;			/* Hook for ethernet stream */
84 	struct	private *next;		/* When hung on the free list */
85 };
86 typedef struct ng_eiface_private *priv_p;
87 
88 /* Interface methods */
89 static void	ng_eiface_init(void *xsc);
90 static void	ng_eiface_start(struct ifnet *ifp);
91 static int	ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
92 #ifdef DEBUG
93 static void	ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
94 #endif
95 
96 /* Netgraph methods */
97 static ng_constructor_t	ng_eiface_constructor;
98 static ng_rcvmsg_t	ng_eiface_rcvmsg;
99 static ng_shutdown_t	ng_eiface_rmnode;
100 static ng_newhook_t	ng_eiface_newhook;
101 static ng_rcvdata_t	ng_eiface_rcvdata;
102 static ng_connect_t	ng_eiface_connect;
103 static ng_disconnect_t	ng_eiface_disconnect;
104 
105 /* Node type descriptor */
106 static struct ng_type typestruct = {
107 	NG_VERSION,
108 	NG_EIFACE_NODE_TYPE,
109 	NULL,
110 	ng_eiface_constructor,
111 	ng_eiface_rcvmsg,
112 	ng_eiface_rmnode,
113 	ng_eiface_newhook,
114 	NULL,
115 	ng_eiface_connect,
116 	ng_eiface_rcvdata,
117 	ng_eiface_rcvdata,
118 	ng_eiface_disconnect,
119 	ng_eiface_cmdlist
120 };
121 NETGRAPH_INIT(eiface, &typestruct);
122 
123 static char ng_eiface_ifname[] = NG_EIFACE_EIFACE_NAME;
124 static int ng_eiface_next_unit;
125 
126 /************************************************************************
127 			INTERFACE STUFF
128  ************************************************************************/
129 
130 /*
131  * Process an ioctl for the virtual interface
132  */
133 static int
134 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
135 {
136 	struct ifreq *const ifr = (struct ifreq *) data;
137 	int s, error = 0;
138 
139 #ifdef DEBUG
140 	ng_eiface_print_ioctl(ifp, command, data);
141 #endif
142 	s = splimp();
143 	switch (command) {
144 
145 	/* These two are mostly handled at a higher layer */
146 	case SIOCSIFADDR:
147 		error = ether_ioctl(ifp, command, data);
148 		break;
149 	case SIOCGIFADDR:
150 		break;
151 
152 	/* Set flags */
153 	case SIOCSIFFLAGS:
154 		/*
155 		 * If the interface is marked up and stopped, then start it.
156 		 * If it is marked down and running, then stop it.
157 		 */
158 		if (ifr->ifr_flags & IFF_UP) {
159 			if (!(ifp->if_flags & IFF_RUNNING)) {
160 				ifp->if_flags &= ~(IFF_OACTIVE);
161 				ifp->if_flags |= IFF_RUNNING;
162 			}
163 		} else {
164 			if (ifp->if_flags & IFF_RUNNING)
165 				ifp->if_flags &= ~(IFF_RUNNING | IFF_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 	/* Stuff that's not supported */
179 	case SIOCADDMULTI:
180 	case SIOCDELMULTI:
181 		error = 0;
182 		break;
183 	case SIOCSIFPHYS:
184 		error = EOPNOTSUPP;
185 		break;
186 
187 	default:
188 		error = EINVAL;
189 		break;
190 	}
191 	(void) splx(s);
192 	return (error);
193 }
194 
195 static void
196 ng_eiface_init(void *xsc)
197 {
198 	priv_p sc = xsc;
199 	struct ifnet *ifp = sc->ifp;
200 	int s;
201 
202 	s = splimp();
203 
204 	ifp->if_flags |= IFF_RUNNING;
205 	ifp->if_flags &= ~IFF_OACTIVE;
206 
207 	splx(s);
208 
209 }
210 
211 /*
212  * This routine is called to deliver a packet out the interface.
213  * We simply relay the packet to
214  * the ether hook, if it is connected.
215  */
216 
217 static void
218 ng_eiface_start(struct ifnet *ifp)
219 {
220 	const priv_p priv = (priv_p) ifp->if_softc;
221 	meta_p meta = NULL;
222 	int len, error = 0;
223 	struct mbuf *m;
224 
225 	/* Check interface flags */
226 	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
227 		return;
228 
229 	/* Don't do anything if output is active */
230 	if( ifp->if_flags & IFF_OACTIVE )
231 		return;
232 
233 	ifp->if_flags |= IFF_OACTIVE;
234 
235 	/*
236 	 * Grab a packet to transmit.
237 	 */
238 	IF_DEQUEUE(&ifp->if_snd, m);
239 
240 	/* If there's nothing to send, return. */
241 	if(m == NULL)
242 	{
243 		ifp->if_flags &= ~IFF_OACTIVE;
244 		return;
245 	}
246 
247 	/* Berkeley packet filter */
248 	/*
249 	 * Pass packet to bpf if there is a listener.
250 	 */
251 	if (ifp->if_bpf)
252 	  bpf_mtap(ifp, m);
253 
254 	/* Copy length before the mbuf gets invalidated */
255 	len = m->m_pkthdr.len;
256 
257 	/* Send packet; if hook is not connected, mbuf will get freed. */
258 	NG_SEND_DATA(error, priv->ether, m, meta);
259 
260 	/* Update stats */
261 	if (error == 0) {
262 		ifp->if_obytes += len;
263 		ifp->if_opackets++;
264 	}
265 
266 	ifp->if_flags &= ~IFF_OACTIVE;
267 
268 	return;
269 }
270 
271 #ifdef DEBUG
272 /*
273  * Display an ioctl to the virtual interface
274  */
275 
276 static void
277 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
278 {
279 	char   *str;
280 
281 	switch (command & IOC_DIRMASK) {
282 	case IOC_VOID:
283 		str = "IO";
284 		break;
285 	case IOC_OUT:
286 		str = "IOR";
287 		break;
288 	case IOC_IN:
289 		str = "IOW";
290 		break;
291 	case IOC_INOUT:
292 		str = "IORW";
293 		break;
294 	default:
295 		str = "IO??";
296 	}
297 	log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
298 	       ifp->if_name, ifp->if_unit,
299 	       str,
300 	       IOCGROUP(command),
301 	       command & 0xff,
302 	       IOCPARM_LEN(command));
303 }
304 #endif /* DEBUG */
305 
306 /************************************************************************
307 			NETGRAPH NODE STUFF
308  ************************************************************************/
309 
310 /*
311  * Constructor for a node
312  */
313 static int
314 ng_eiface_constructor(node_p *nodep)
315 {
316 	struct ifnet *ifp;
317 	node_p node;
318 	priv_p priv;
319 	int error = 0;
320 
321 	/* Allocate node and interface private structures */
322 	MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
323 	if (priv == NULL)
324 		return (ENOMEM);
325 	bzero(priv, sizeof(*priv));
326 
327 	ifp = &(priv->arpcom.ac_if);
328 
329 	/* Link them together */
330 	ifp->if_softc = priv;
331 	priv->ifp = ifp;
332 
333 	/* Call generic node constructor */
334 	if ((error = ng_make_node_common(&typestruct, nodep))) {
335 		FREE(priv, M_NETGRAPH);
336 		return (error);
337 	}
338 	node = *nodep;
339 
340 	/* Link together node and private info */
341 	node->private = priv;
342 	priv->node = node;
343 
344 	/* Initialize interface structure */
345 	ifp->if_name = ng_eiface_ifname;
346 	ifp->if_unit = ng_eiface_next_unit++;
347 	ifp->if_init = ng_eiface_init;
348 	ifp->if_output = ether_output;
349 	ifp->if_start = ng_eiface_start;
350 	ifp->if_ioctl = ng_eiface_ioctl;
351 	ifp->if_watchdog = NULL;
352 	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
353 	ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
354 
355 	TAILQ_INIT(&ifp->if_addrhead);
356 
357 	/* Give this node name *
358 	bzero(ifname, sizeof(ifname));
359 	sprintf(ifname, "if%s%d", ifp->if_name, ifp->if_unit);
360 	(void) ng_name_node(node, ifname);
361 	*/
362 
363 	/* Attach the interface */
364 	ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
365 
366 	/* Done */
367 	return (0);
368 }
369 
370 /*
371  * Give our ok for a hook to be added
372  */
373 static int
374 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
375 {
376 	priv_p priv = node->private;
377 
378 	if (strcmp(name, NG_EIFACE_HOOK_ETHER))
379 		return (EPFNOSUPPORT);
380 	if (priv->ether != NULL)
381 		return (EISCONN);
382 	priv->ether = hook;
383 	hook->private = &priv->ether;
384 
385 	return (0);
386 }
387 
388 /*
389  * Receive a control message
390  */
391 static int
392 ng_eiface_rcvmsg(node_p node, struct ng_mesg *msg,
393 		const char *retaddr, struct ng_mesg **rptr)
394 {
395 	const priv_p priv = node->private;
396 	struct ifnet *const ifp = priv->ifp;
397 	struct ng_mesg *resp = NULL;
398 	int error = 0;
399 
400 	switch (msg->header.typecookie) {
401 	case NGM_EIFACE_COOKIE:
402 		switch (msg->header.cmd) {
403 
404 		case NGM_EIFACE_SET:
405 		    {
406 		      struct ng_eiface_par *eaddr;
407 
408 		      if (msg->header.arglen != sizeof(struct ng_eiface_par))
409 			{
410 			  error = EINVAL;
411 			  break;
412 			}
413 		      eaddr = (struct ng_eiface_par *)(msg->data);
414 
415 		      priv->arpcom.ac_enaddr[0] = eaddr->oct0;
416 		      priv->arpcom.ac_enaddr[1] = eaddr->oct1;
417 		      priv->arpcom.ac_enaddr[2] = eaddr->oct2;
418 		      priv->arpcom.ac_enaddr[3] = eaddr->oct3;
419 		      priv->arpcom.ac_enaddr[4] = eaddr->oct4;
420 		      priv->arpcom.ac_enaddr[5] = eaddr->oct5;
421 
422 		      break;
423 		    }
424 
425 		case NGM_EIFACE_GET_IFNAME:
426 		    {
427 			struct ng_eiface_ifname *arg;
428 
429 			NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
430 			if (resp == NULL) {
431 				error = ENOMEM;
432 				break;
433 			}
434 			arg = (struct ng_eiface_ifname *) resp->data;
435 			sprintf(arg->ngif_name,
436 			    "%s%d", ifp->if_name, ifp->if_unit);
437 			break;
438 		    }
439 
440 		case NGM_EIFACE_GET_IFADDRS:
441 		    {
442 			struct ifaddr *ifa;
443 			caddr_t ptr;
444 			int buflen;
445 
446 #define SA_SIZE(s)	((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
447 
448 			/* Determine size of response and allocate it */
449 			buflen = 0;
450 			TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
451 				buflen += SA_SIZE(ifa->ifa_addr);
452 			NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
453 			if (resp == NULL) {
454 				error = ENOMEM;
455 				break;
456 			}
457 
458 			/* Add addresses */
459 			ptr = resp->data;
460 			TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
461 				const int len = SA_SIZE(ifa->ifa_addr);
462 
463 				if (buflen < len) {
464 					log(LOG_ERR, "%s%d: len changed?\n",
465 					    ifp->if_name, ifp->if_unit);
466 					break;
467 				}
468 				bcopy(ifa->ifa_addr, ptr, len);
469 				ptr += len;
470 				buflen -= len;
471 			}
472 			break;
473 #undef SA_SIZE
474 		    }
475 
476 		default:
477 			error = EINVAL;
478 			break;
479 		}
480 		break;
481 	default:
482 		error = EINVAL;
483 		break;
484 	}
485 	if (rptr)
486 		*rptr = resp;
487 	else if (resp)
488 		FREE(resp, M_NETGRAPH);
489 	FREE(msg, M_NETGRAPH);
490 	return (error);
491 }
492 
493 /*
494  * Recive data from a hook. Pass the packet to the ether_input routine.
495  */
496 static int
497 ng_eiface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
498 {
499 	const priv_p priv = hook->node->private;
500 	struct ifnet *const ifp = priv->ifp;
501 	int s, error = 0;
502 	struct ether_header *eh;
503 	u_short ether_type;
504 
505 	/* Meta-data is end its life here... */
506 	NG_FREE_META(meta);
507 
508 	if (m == NULL)
509 	  {
510 	    printf("ng_eiface: mbuf is null.\n");
511 	    return (EINVAL);
512 	  }
513 
514 	if ( !(ifp->if_flags & IFF_UP) ) {
515 		return (ENETDOWN);
516 	}
517 
518 	/* Note receiving interface */
519 	m->m_pkthdr.rcvif = ifp;
520 
521 	/* Update interface stats */
522 	ifp->if_ipackets++;
523 
524 	/* Berkeley packet filter */
525 	if (ifp->if_bpf)
526 	  bpf_mtap(ifp, m);
527 
528 	eh = mtod( m, struct ether_header * );
529 	ether_type = ntohs(eh->ether_type);
530 
531 	s = splimp();
532 	    m->m_pkthdr.len -= sizeof(*eh);
533 	    m->m_len -= sizeof(*eh);
534 	    if ( m->m_len )
535 	      {
536 		m->m_data += sizeof(*eh);
537 	      }
538 	    else
539 	      {
540 		if ( ether_type == ETHERTYPE_ARP )
541 		{
542 		m->m_len = m->m_next->m_len;
543 		m->m_data = m->m_next->m_data;
544 		}
545 	      }
546 	splx(s);
547 
548 	ether_input(ifp, eh, m);
549 
550 	/* Done */
551 	return (error);
552 }
553 
554 /*
555  * Because the BSD networking code doesn't support the removal of
556  * networking interfaces, iface nodes (once created) are persistent.
557  * So this method breaks all connections and marks the interface
558  * down, but does not remove the node.
559  */
560 static int
561 ng_eiface_rmnode(node_p node)
562 {
563 	const priv_p priv = node->private;
564 	struct ifnet *const ifp = priv->ifp;
565 
566 	ng_cutlinks(node);
567 	node->flags &= ~NG_INVALID;
568 	ifp->if_flags &= ~(IFF_UP | IFF_RUNNING | IFF_OACTIVE);
569 	return (0);
570 }
571 
572 
573 /*
574  * This is called once we've already connected a new hook to the other node.
575  * It gives us a chance to balk at the last minute.
576  */
577 static int
578 ng_eiface_connect(hook_p hook)
579 {
580 	/* be really amiable and just say "YUP that's OK by me! " */
581 	return (0);
582 }
583 
584 /*
585  * Hook disconnection
586  */
587 static int
588 ng_eiface_disconnect(hook_p hook)
589 {
590 	const priv_p priv = hook->node->private;
591 
592 	priv->ether = NULL;
593 	return (0);
594 }
595