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 *
| 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 *
|
46
47#include <netgraph/ng_message.h>
48#include <netgraph/netgraph.h>
49#include <netgraph/ng_parse.h>
50#include <netgraph/ng_eiface.h>
51
52#include <net/bpf.h>
53#include <net/ethernet.h>
54#include <net/if_arp.h>
55
56static const struct ng_cmdlist ng_eiface_cmdlist[] = {
57 {
58 NGM_EIFACE_COOKIE,
59 NGM_EIFACE_GET_IFNAME,
60 "getifname",
61 NULL,
62 &ng_parse_string_type
63 },
64 {
65 NGM_EIFACE_COOKIE,
66 NGM_EIFACE_SET,
67 "set",
68 &ng_parse_enaddr_type,
69 NULL
70 },
71 { 0 }
72};
73
74/* Node private data */
75struct ng_eiface_private {
76 struct ifnet *ifp; /* per-interface network data */
77 int unit; /* Interface unit number */
78 node_p node; /* Our netgraph node */
79 hook_p ether; /* Hook for ethernet stream */
80};
81typedef struct ng_eiface_private *priv_p;
82
83/* Interface methods */
84static void ng_eiface_init(void *xsc);
85static void ng_eiface_start(struct ifnet *ifp);
86static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
87#ifdef DEBUG
88static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
89#endif
90
91/* Netgraph methods */
92static int ng_eiface_mod_event(module_t, int, void *);
93static ng_constructor_t ng_eiface_constructor;
94static ng_rcvmsg_t ng_eiface_rcvmsg;
95static ng_shutdown_t ng_eiface_rmnode;
96static ng_newhook_t ng_eiface_newhook;
97static ng_rcvdata_t ng_eiface_rcvdata;
98static ng_disconnect_t ng_eiface_disconnect;
99
100/* Node type descriptor */
101static struct ng_type typestruct = {
102 .version = NG_ABI_VERSION,
103 .name = NG_EIFACE_NODE_TYPE,
104 .mod_event = ng_eiface_mod_event,
105 .constructor = ng_eiface_constructor,
106 .rcvmsg = ng_eiface_rcvmsg,
107 .shutdown = ng_eiface_rmnode,
108 .newhook = ng_eiface_newhook,
109 .rcvdata = ng_eiface_rcvdata,
110 .disconnect = ng_eiface_disconnect,
111 .cmdlist = ng_eiface_cmdlist
112};
113NETGRAPH_INIT(eiface, &typestruct);
114
115static struct unrhdr *ng_eiface_unit;
116
117/************************************************************************
118 INTERFACE STUFF
119 ************************************************************************/
120
121/*
122 * Process an ioctl for the virtual interface
123 */
124static int
125ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
126{
127 struct ifreq *const ifr = (struct ifreq *)data;
128 int s, error = 0;
129
130#ifdef DEBUG
131 ng_eiface_print_ioctl(ifp, command, data);
132#endif
133 s = splimp();
134 switch (command) {
135
136 /* These two are mostly handled at a higher layer */
137 case SIOCSIFADDR:
138 error = ether_ioctl(ifp, command, data);
139 break;
140 case SIOCGIFADDR:
141 break;
142
143 /* Set flags */
144 case SIOCSIFFLAGS:
145 /*
146 * If the interface is marked up and stopped, then start it.
147 * If it is marked down and running, then stop it.
148 */
149 if (ifp->if_flags & IFF_UP) {
150 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
151 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
152 ifp->if_drv_flags |= IFF_DRV_RUNNING;
153 }
154 } else {
155 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
156 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
157 IFF_DRV_OACTIVE);
158 }
159 break;
160
161 /* Set the interface MTU */
162 case SIOCSIFMTU:
163 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
164 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
165 error = EINVAL;
166 else
167 ifp->if_mtu = ifr->ifr_mtu;
168 break;
169
170 /* Stuff that's not supported */
171 case SIOCADDMULTI:
172 case SIOCDELMULTI:
173 error = 0;
174 break;
175 case SIOCSIFPHYS:
176 error = EOPNOTSUPP;
177 break;
178
179 default:
180 error = EINVAL;
181 break;
182 }
183 splx(s);
184 return (error);
185}
186
187static void
188ng_eiface_init(void *xsc)
189{
190 priv_p sc = xsc;
191 struct ifnet *ifp = sc->ifp;
192 int s;
193
194 s = splimp();
195
196 ifp->if_drv_flags |= IFF_DRV_RUNNING;
197 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
198
199 splx(s);
200}
201
202/*
203 * We simply relay the packet to the "ether" hook, if it is connected.
204 * We have been through the netgraph locking and are guaranteed to
205 * be the only code running in this node at this time.
206 */
207static void
208ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
209{
210 struct ifnet *ifp = arg1;
211 const priv_p priv = (priv_p)ifp->if_softc;
212 int error = 0;
213 struct mbuf *m;
214
215 /* Check interface flags */
216
217 if (!((ifp->if_flags & IFF_UP) &&
218 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
219 return;
220
221 for (;;) {
222 /*
223 * Grab a packet to transmit.
224 */
225 IF_DEQUEUE(&ifp->if_snd, m);
226
227 /* If there's nothing to send, break. */
228 if (m == NULL)
229 break;
230
231 /*
232 * Berkeley packet filter.
233 * Pass packet to bpf if there is a listener.
234 * XXX is this safe? locking?
235 */
236 BPF_MTAP(ifp, m);
237
238 if (ifp->if_flags & IFF_MONITOR) {
239 ifp->if_ipackets++;
240 m_freem(m);
241 continue;
242 }
243
244 /*
245 * Send packet; if hook is not connected, mbuf will get
246 * freed.
247 */
248 NG_SEND_DATA_ONLY(error, priv->ether, m);
249
250 /* Update stats */
251 if (error == 0)
252 ifp->if_opackets++;
253 else
254 ifp->if_oerrors++;
255 }
256
257 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
258
259 return;
260}
261
262/*
263 * This routine is called to deliver a packet out the interface.
264 * We simply queue the netgraph version to be called when netgraph locking
265 * allows it to happen.
266 * Until we know what the rest of the networking code is doing for
267 * locking, we don't know how we will interact with it.
268 * Take comfort from the fact that the ifnet struct is part of our
269 * private info and can't go away while we are queued.
270 * [Though we don't know it is still there now....]
271 * it is possible we don't gain anything from this because
272 * we would like to get the mbuf and queue it as data
273 * somehow, but we can't and if we did would we solve anything?
274 */
275static void
276ng_eiface_start(struct ifnet *ifp)
277{
278
279 const priv_p priv = (priv_p)ifp->if_softc;
280
281 /* Don't do anything if output is active */
282 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
283 return;
284
285 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
286
287 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
288 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
289}
290
291#ifdef DEBUG
292/*
293 * Display an ioctl to the virtual interface
294 */
295
296static void
297ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
298{
299 char *str;
300
301 switch (command & IOC_DIRMASK) {
302 case IOC_VOID:
303 str = "IO";
304 break;
305 case IOC_OUT:
306 str = "IOR";
307 break;
308 case IOC_IN:
309 str = "IOW";
310 break;
311 case IOC_INOUT:
312 str = "IORW";
313 break;
314 default:
315 str = "IO??";
316 }
317 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
318 ifp->if_xname,
319 str,
320 IOCGROUP(command),
321 command & 0xff,
322 IOCPARM_LEN(command));
323}
324#endif /* DEBUG */
325
326/************************************************************************
327 NETGRAPH NODE STUFF
328 ************************************************************************/
329
330/*
331 * Constructor for a node
332 */
333static int
334ng_eiface_constructor(node_p node)
335{
336 INIT_VNET_NETGRAPH(curvnet);
337 struct ifnet *ifp;
338 priv_p priv;
339 u_char eaddr[6] = {0,0,0,0,0,0};
340
341 /* Allocate node and interface private structures */
342 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
343 if (priv == NULL)
344 return (ENOMEM);
345
346 ifp = priv->ifp = if_alloc(IFT_ETHER);
347 if (ifp == NULL) {
348 free(priv, M_NETGRAPH);
349 return (ENOSPC);
350 }
351
352 /* Link them together */
353 ifp->if_softc = priv;
354
355 /* Get an interface unit number */
356 priv->unit = alloc_unr(V_ng_eiface_unit);
357
358 /* Link together node and private info */
359 NG_NODE_SET_PRIVATE(node, priv);
360 priv->node = node;
361
362 /* Initialize interface structure */
363 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
364 ifp->if_init = ng_eiface_init;
365 ifp->if_output = ether_output;
366 ifp->if_start = ng_eiface_start;
367 ifp->if_ioctl = ng_eiface_ioctl;
368 ifp->if_watchdog = NULL;
369 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
370 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
371
372#if 0
373 /* Give this node name */
374 bzero(ifname, sizeof(ifname));
375 sprintf(ifname, "if%s", ifp->if_xname);
376 (void)ng_name_node(node, ifname);
377#endif
378
379 /* Attach the interface */
380 ether_ifattach(ifp, eaddr);
381
382 /* Done */
383 return (0);
384}
385
386/*
387 * Give our ok for a hook to be added
388 */
389static int
390ng_eiface_newhook(node_p node, hook_p hook, const char *name)
391{
392 priv_p priv = NG_NODE_PRIVATE(node);
393 struct ifnet *ifp = priv->ifp;
394
395 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
396 return (EPFNOSUPPORT);
397 if (priv->ether != NULL)
398 return (EISCONN);
399 priv->ether = hook;
400 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
401
402 if_link_state_change(ifp, LINK_STATE_UP);
403
404 return (0);
405}
406
407/*
408 * Receive a control message
409 */
410static int
411ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
412{
413 const priv_p priv = NG_NODE_PRIVATE(node);
414 struct ifnet *const ifp = priv->ifp;
415 struct ng_mesg *resp = NULL;
416 int error = 0;
417 struct ng_mesg *msg;
418
419 NGI_GET_MSG(item, msg);
420 switch (msg->header.typecookie) {
421 case NGM_EIFACE_COOKIE:
422 switch (msg->header.cmd) {
423
424 case NGM_EIFACE_SET:
425 {
426 if (msg->header.arglen != ETHER_ADDR_LEN) {
427 error = EINVAL;
428 break;
429 }
430 error = if_setlladdr(priv->ifp,
431 (u_char *)msg->data, ETHER_ADDR_LEN);
432 break;
433 }
434
435 case NGM_EIFACE_GET_IFNAME:
436 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
437 if (resp == NULL) {
438 error = ENOMEM;
439 break;
440 }
441 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
442 break;
443
444 case NGM_EIFACE_GET_IFADDRS:
445 {
446 struct ifaddr *ifa;
447 caddr_t ptr;
448 int buflen;
449
450 /* Determine size of response and allocate it */
451 buflen = 0;
452 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
453 buflen += SA_SIZE(ifa->ifa_addr);
454 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
455 if (resp == NULL) {
456 error = ENOMEM;
457 break;
458 }
459
460 /* Add addresses */
461 ptr = resp->data;
462 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
463 const int len = SA_SIZE(ifa->ifa_addr);
464
465 if (buflen < len) {
466 log(LOG_ERR, "%s: len changed?\n",
467 ifp->if_xname);
468 break;
469 }
470 bcopy(ifa->ifa_addr, ptr, len);
471 ptr += len;
472 buflen -= len;
473 }
474 break;
475 }
476
477 default:
478 error = EINVAL;
479 break;
480 } /* end of inner switch() */
481 break;
482 case NGM_FLOW_COOKIE:
483 switch (msg->header.cmd) {
484 case NGM_LINK_IS_UP:
485 if_link_state_change(ifp, LINK_STATE_UP);
486 break;
487 case NGM_LINK_IS_DOWN:
488 if_link_state_change(ifp, LINK_STATE_DOWN);
489 break;
490 default:
491 break;
492 }
493 break;
494 default:
495 error = EINVAL;
496 break;
497 }
498 NG_RESPOND_MSG(error, node, item, resp);
499 NG_FREE_MSG(msg);
500 return (error);
501}
502
503/*
504 * Receive data from a hook. Pass the packet to the ether_input routine.
505 */
506static int
507ng_eiface_rcvdata(hook_p hook, item_p item)
508{
509 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
510 struct ifnet *const ifp = priv->ifp;
511 struct mbuf *m;
512
513 NGI_GET_M(item, m);
514 NG_FREE_ITEM(item);
515
516 if (!((ifp->if_flags & IFF_UP) &&
517 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
518 NG_FREE_M(m);
519 return (ENETDOWN);
520 }
521
522 if (m->m_len < ETHER_HDR_LEN) {
523 m = m_pullup(m, ETHER_HDR_LEN);
524 if (m == NULL)
525 return (EINVAL);
526 }
527
528 /* Note receiving interface */
529 m->m_pkthdr.rcvif = ifp;
530
531 /* Update interface stats */
532 ifp->if_ipackets++;
533
534 (*ifp->if_input)(ifp, m);
535
536 /* Done */
537 return (0);
538}
539
540/*
541 * Shutdown processing.
542 */
543static int
544ng_eiface_rmnode(node_p node)
545{
546 INIT_VNET_NETGRAPH(curvnet);
547 const priv_p priv = NG_NODE_PRIVATE(node);
548 struct ifnet *const ifp = priv->ifp;
549
550 /*
551 * the ifnet may be in a different vnet than the netgraph node,
552 * hence we have to change the current vnet context here.
553 */
554 CURVNET_SET_QUIET(ifp->if_vnet);
555 ether_ifdetach(ifp);
556 if_free(ifp);
557 CURVNET_RESTORE();
558 free_unr(V_ng_eiface_unit, priv->unit);
559 free(priv, M_NETGRAPH);
560 NG_NODE_SET_PRIVATE(node, NULL);
561 NG_NODE_UNREF(node);
562 return (0);
563}
564
565/*
566 * Hook disconnection
567 */
568static int
569ng_eiface_disconnect(hook_p hook)
570{
571 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
572
573 priv->ether = NULL;
574 return (0);
575}
576
577/*
578 * Handle loading and unloading for this node type.
579 */
580static int
581ng_eiface_mod_event(module_t mod, int event, void *data)
582{
583 int error = 0;
584
585 switch (event) {
586 case MOD_LOAD:
587 V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
588 break;
589 case MOD_UNLOAD:
590 delete_unrhdr(V_ng_eiface_unit);
591 break;
592 default:
593 error = EOPNOTSUPP;
594 break;
595 }
596 return (error);
597}
| 47
48#include <netgraph/ng_message.h>
49#include <netgraph/netgraph.h>
50#include <netgraph/ng_parse.h>
51#include <netgraph/ng_eiface.h>
52
53#include <net/bpf.h>
54#include <net/ethernet.h>
55#include <net/if_arp.h>
56
57static const struct ng_cmdlist ng_eiface_cmdlist[] = {
58 {
59 NGM_EIFACE_COOKIE,
60 NGM_EIFACE_GET_IFNAME,
61 "getifname",
62 NULL,
63 &ng_parse_string_type
64 },
65 {
66 NGM_EIFACE_COOKIE,
67 NGM_EIFACE_SET,
68 "set",
69 &ng_parse_enaddr_type,
70 NULL
71 },
72 { 0 }
73};
74
75/* Node private data */
76struct ng_eiface_private {
77 struct ifnet *ifp; /* per-interface network data */
78 int unit; /* Interface unit number */
79 node_p node; /* Our netgraph node */
80 hook_p ether; /* Hook for ethernet stream */
81};
82typedef struct ng_eiface_private *priv_p;
83
84/* Interface methods */
85static void ng_eiface_init(void *xsc);
86static void ng_eiface_start(struct ifnet *ifp);
87static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
88#ifdef DEBUG
89static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
90#endif
91
92/* Netgraph methods */
93static int ng_eiface_mod_event(module_t, int, void *);
94static ng_constructor_t ng_eiface_constructor;
95static ng_rcvmsg_t ng_eiface_rcvmsg;
96static ng_shutdown_t ng_eiface_rmnode;
97static ng_newhook_t ng_eiface_newhook;
98static ng_rcvdata_t ng_eiface_rcvdata;
99static ng_disconnect_t ng_eiface_disconnect;
100
101/* Node type descriptor */
102static struct ng_type typestruct = {
103 .version = NG_ABI_VERSION,
104 .name = NG_EIFACE_NODE_TYPE,
105 .mod_event = ng_eiface_mod_event,
106 .constructor = ng_eiface_constructor,
107 .rcvmsg = ng_eiface_rcvmsg,
108 .shutdown = ng_eiface_rmnode,
109 .newhook = ng_eiface_newhook,
110 .rcvdata = ng_eiface_rcvdata,
111 .disconnect = ng_eiface_disconnect,
112 .cmdlist = ng_eiface_cmdlist
113};
114NETGRAPH_INIT(eiface, &typestruct);
115
116static struct unrhdr *ng_eiface_unit;
117
118/************************************************************************
119 INTERFACE STUFF
120 ************************************************************************/
121
122/*
123 * Process an ioctl for the virtual interface
124 */
125static int
126ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
127{
128 struct ifreq *const ifr = (struct ifreq *)data;
129 int s, error = 0;
130
131#ifdef DEBUG
132 ng_eiface_print_ioctl(ifp, command, data);
133#endif
134 s = splimp();
135 switch (command) {
136
137 /* These two are mostly handled at a higher layer */
138 case SIOCSIFADDR:
139 error = ether_ioctl(ifp, command, data);
140 break;
141 case SIOCGIFADDR:
142 break;
143
144 /* Set flags */
145 case SIOCSIFFLAGS:
146 /*
147 * If the interface is marked up and stopped, then start it.
148 * If it is marked down and running, then stop it.
149 */
150 if (ifp->if_flags & IFF_UP) {
151 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
152 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
153 ifp->if_drv_flags |= IFF_DRV_RUNNING;
154 }
155 } else {
156 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
157 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
158 IFF_DRV_OACTIVE);
159 }
160 break;
161
162 /* Set the interface MTU */
163 case SIOCSIFMTU:
164 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
165 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
166 error = EINVAL;
167 else
168 ifp->if_mtu = ifr->ifr_mtu;
169 break;
170
171 /* Stuff that's not supported */
172 case SIOCADDMULTI:
173 case SIOCDELMULTI:
174 error = 0;
175 break;
176 case SIOCSIFPHYS:
177 error = EOPNOTSUPP;
178 break;
179
180 default:
181 error = EINVAL;
182 break;
183 }
184 splx(s);
185 return (error);
186}
187
188static void
189ng_eiface_init(void *xsc)
190{
191 priv_p sc = xsc;
192 struct ifnet *ifp = sc->ifp;
193 int s;
194
195 s = splimp();
196
197 ifp->if_drv_flags |= IFF_DRV_RUNNING;
198 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
199
200 splx(s);
201}
202
203/*
204 * We simply relay the packet to the "ether" hook, if it is connected.
205 * We have been through the netgraph locking and are guaranteed to
206 * be the only code running in this node at this time.
207 */
208static void
209ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
210{
211 struct ifnet *ifp = arg1;
212 const priv_p priv = (priv_p)ifp->if_softc;
213 int error = 0;
214 struct mbuf *m;
215
216 /* Check interface flags */
217
218 if (!((ifp->if_flags & IFF_UP) &&
219 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
220 return;
221
222 for (;;) {
223 /*
224 * Grab a packet to transmit.
225 */
226 IF_DEQUEUE(&ifp->if_snd, m);
227
228 /* If there's nothing to send, break. */
229 if (m == NULL)
230 break;
231
232 /*
233 * Berkeley packet filter.
234 * Pass packet to bpf if there is a listener.
235 * XXX is this safe? locking?
236 */
237 BPF_MTAP(ifp, m);
238
239 if (ifp->if_flags & IFF_MONITOR) {
240 ifp->if_ipackets++;
241 m_freem(m);
242 continue;
243 }
244
245 /*
246 * Send packet; if hook is not connected, mbuf will get
247 * freed.
248 */
249 NG_SEND_DATA_ONLY(error, priv->ether, m);
250
251 /* Update stats */
252 if (error == 0)
253 ifp->if_opackets++;
254 else
255 ifp->if_oerrors++;
256 }
257
258 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
259
260 return;
261}
262
263/*
264 * This routine is called to deliver a packet out the interface.
265 * We simply queue the netgraph version to be called when netgraph locking
266 * allows it to happen.
267 * Until we know what the rest of the networking code is doing for
268 * locking, we don't know how we will interact with it.
269 * Take comfort from the fact that the ifnet struct is part of our
270 * private info and can't go away while we are queued.
271 * [Though we don't know it is still there now....]
272 * it is possible we don't gain anything from this because
273 * we would like to get the mbuf and queue it as data
274 * somehow, but we can't and if we did would we solve anything?
275 */
276static void
277ng_eiface_start(struct ifnet *ifp)
278{
279
280 const priv_p priv = (priv_p)ifp->if_softc;
281
282 /* Don't do anything if output is active */
283 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
284 return;
285
286 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
287
288 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
289 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
290}
291
292#ifdef DEBUG
293/*
294 * Display an ioctl to the virtual interface
295 */
296
297static void
298ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
299{
300 char *str;
301
302 switch (command & IOC_DIRMASK) {
303 case IOC_VOID:
304 str = "IO";
305 break;
306 case IOC_OUT:
307 str = "IOR";
308 break;
309 case IOC_IN:
310 str = "IOW";
311 break;
312 case IOC_INOUT:
313 str = "IORW";
314 break;
315 default:
316 str = "IO??";
317 }
318 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
319 ifp->if_xname,
320 str,
321 IOCGROUP(command),
322 command & 0xff,
323 IOCPARM_LEN(command));
324}
325#endif /* DEBUG */
326
327/************************************************************************
328 NETGRAPH NODE STUFF
329 ************************************************************************/
330
331/*
332 * Constructor for a node
333 */
334static int
335ng_eiface_constructor(node_p node)
336{
337 INIT_VNET_NETGRAPH(curvnet);
338 struct ifnet *ifp;
339 priv_p priv;
340 u_char eaddr[6] = {0,0,0,0,0,0};
341
342 /* Allocate node and interface private structures */
343 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
344 if (priv == NULL)
345 return (ENOMEM);
346
347 ifp = priv->ifp = if_alloc(IFT_ETHER);
348 if (ifp == NULL) {
349 free(priv, M_NETGRAPH);
350 return (ENOSPC);
351 }
352
353 /* Link them together */
354 ifp->if_softc = priv;
355
356 /* Get an interface unit number */
357 priv->unit = alloc_unr(V_ng_eiface_unit);
358
359 /* Link together node and private info */
360 NG_NODE_SET_PRIVATE(node, priv);
361 priv->node = node;
362
363 /* Initialize interface structure */
364 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
365 ifp->if_init = ng_eiface_init;
366 ifp->if_output = ether_output;
367 ifp->if_start = ng_eiface_start;
368 ifp->if_ioctl = ng_eiface_ioctl;
369 ifp->if_watchdog = NULL;
370 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
371 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
372
373#if 0
374 /* Give this node name */
375 bzero(ifname, sizeof(ifname));
376 sprintf(ifname, "if%s", ifp->if_xname);
377 (void)ng_name_node(node, ifname);
378#endif
379
380 /* Attach the interface */
381 ether_ifattach(ifp, eaddr);
382
383 /* Done */
384 return (0);
385}
386
387/*
388 * Give our ok for a hook to be added
389 */
390static int
391ng_eiface_newhook(node_p node, hook_p hook, const char *name)
392{
393 priv_p priv = NG_NODE_PRIVATE(node);
394 struct ifnet *ifp = priv->ifp;
395
396 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
397 return (EPFNOSUPPORT);
398 if (priv->ether != NULL)
399 return (EISCONN);
400 priv->ether = hook;
401 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
402
403 if_link_state_change(ifp, LINK_STATE_UP);
404
405 return (0);
406}
407
408/*
409 * Receive a control message
410 */
411static int
412ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
413{
414 const priv_p priv = NG_NODE_PRIVATE(node);
415 struct ifnet *const ifp = priv->ifp;
416 struct ng_mesg *resp = NULL;
417 int error = 0;
418 struct ng_mesg *msg;
419
420 NGI_GET_MSG(item, msg);
421 switch (msg->header.typecookie) {
422 case NGM_EIFACE_COOKIE:
423 switch (msg->header.cmd) {
424
425 case NGM_EIFACE_SET:
426 {
427 if (msg->header.arglen != ETHER_ADDR_LEN) {
428 error = EINVAL;
429 break;
430 }
431 error = if_setlladdr(priv->ifp,
432 (u_char *)msg->data, ETHER_ADDR_LEN);
433 break;
434 }
435
436 case NGM_EIFACE_GET_IFNAME:
437 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
438 if (resp == NULL) {
439 error = ENOMEM;
440 break;
441 }
442 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
443 break;
444
445 case NGM_EIFACE_GET_IFADDRS:
446 {
447 struct ifaddr *ifa;
448 caddr_t ptr;
449 int buflen;
450
451 /* Determine size of response and allocate it */
452 buflen = 0;
453 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
454 buflen += SA_SIZE(ifa->ifa_addr);
455 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
456 if (resp == NULL) {
457 error = ENOMEM;
458 break;
459 }
460
461 /* Add addresses */
462 ptr = resp->data;
463 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
464 const int len = SA_SIZE(ifa->ifa_addr);
465
466 if (buflen < len) {
467 log(LOG_ERR, "%s: len changed?\n",
468 ifp->if_xname);
469 break;
470 }
471 bcopy(ifa->ifa_addr, ptr, len);
472 ptr += len;
473 buflen -= len;
474 }
475 break;
476 }
477
478 default:
479 error = EINVAL;
480 break;
481 } /* end of inner switch() */
482 break;
483 case NGM_FLOW_COOKIE:
484 switch (msg->header.cmd) {
485 case NGM_LINK_IS_UP:
486 if_link_state_change(ifp, LINK_STATE_UP);
487 break;
488 case NGM_LINK_IS_DOWN:
489 if_link_state_change(ifp, LINK_STATE_DOWN);
490 break;
491 default:
492 break;
493 }
494 break;
495 default:
496 error = EINVAL;
497 break;
498 }
499 NG_RESPOND_MSG(error, node, item, resp);
500 NG_FREE_MSG(msg);
501 return (error);
502}
503
504/*
505 * Receive data from a hook. Pass the packet to the ether_input routine.
506 */
507static int
508ng_eiface_rcvdata(hook_p hook, item_p item)
509{
510 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
511 struct ifnet *const ifp = priv->ifp;
512 struct mbuf *m;
513
514 NGI_GET_M(item, m);
515 NG_FREE_ITEM(item);
516
517 if (!((ifp->if_flags & IFF_UP) &&
518 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
519 NG_FREE_M(m);
520 return (ENETDOWN);
521 }
522
523 if (m->m_len < ETHER_HDR_LEN) {
524 m = m_pullup(m, ETHER_HDR_LEN);
525 if (m == NULL)
526 return (EINVAL);
527 }
528
529 /* Note receiving interface */
530 m->m_pkthdr.rcvif = ifp;
531
532 /* Update interface stats */
533 ifp->if_ipackets++;
534
535 (*ifp->if_input)(ifp, m);
536
537 /* Done */
538 return (0);
539}
540
541/*
542 * Shutdown processing.
543 */
544static int
545ng_eiface_rmnode(node_p node)
546{
547 INIT_VNET_NETGRAPH(curvnet);
548 const priv_p priv = NG_NODE_PRIVATE(node);
549 struct ifnet *const ifp = priv->ifp;
550
551 /*
552 * the ifnet may be in a different vnet than the netgraph node,
553 * hence we have to change the current vnet context here.
554 */
555 CURVNET_SET_QUIET(ifp->if_vnet);
556 ether_ifdetach(ifp);
557 if_free(ifp);
558 CURVNET_RESTORE();
559 free_unr(V_ng_eiface_unit, priv->unit);
560 free(priv, M_NETGRAPH);
561 NG_NODE_SET_PRIVATE(node, NULL);
562 NG_NODE_UNREF(node);
563 return (0);
564}
565
566/*
567 * Hook disconnection
568 */
569static int
570ng_eiface_disconnect(hook_p hook)
571{
572 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
573
574 priv->ether = NULL;
575 return (0);
576}
577
578/*
579 * Handle loading and unloading for this node type.
580 */
581static int
582ng_eiface_mod_event(module_t mod, int event, void *data)
583{
584 int error = 0;
585
586 switch (event) {
587 case MOD_LOAD:
588 V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
589 break;
590 case MOD_UNLOAD:
591 delete_unrhdr(V_ng_eiface_unit);
592 break;
593 default:
594 error = EOPNOTSUPP;
595 break;
596 }
597 return (error);
598}
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