kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.
[dragonfly.git] / sys / netgraph7 / ng_eiface.c
CommitLineData
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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: src/sys/netgraph/ng_eiface.c,v 1.39 2007/07/26 10:54:33 glebius Exp $
5a975a3d 29 * $DragonFly: src/sys/netgraph7/ng_eiface.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
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30 */
31
32#include <sys/param.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/sockio.h>
40#include <sys/socket.h>
41#include <sys/syslog.h>
42
43#include <net/if.h>
44#include <net/if_types.h>
45#include <net/netisr.h>
46
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47#include "ng_message.h"
48#include "netgraph.h"
49#include "ng_parse.h"
50#include "ng_eiface.h"
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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 struct ifnet *ifp;
337 priv_p priv;
338 u_char eaddr[6] = {0,0,0,0,0,0};
339
340 /* Allocate node and interface private structures */
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341 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
342 M_WAITOK | M_NULLOK | M_ZERO);
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343 if (priv == NULL)
344 return (ENOMEM);
345
346 ifp = priv->ifp = if_alloc(IFT_ETHER);
347 if (ifp == NULL) {
5a975a3d 348 kfree(priv, M_NETGRAPH);
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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(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:
5a975a3d 436 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
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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#define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
451
452 /* Determine size of response and allocate it */
453 buflen = 0;
454 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
455 buflen += SA_SIZE(ifa->ifa_addr);
5a975a3d 456 NG_MKRESPONSE(resp, msg, buflen, M_WAITOK | M_NULLOK);
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457 if (resp == NULL) {
458 error = ENOMEM;
459 break;
460 }
461
462 /* Add addresses */
463 ptr = resp->data;
464 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
465 const int len = SA_SIZE(ifa->ifa_addr);
466
467 if (buflen < len) {
468 log(LOG_ERR, "%s: len changed?\n",
469 ifp->if_xname);
470 break;
471 }
472 bcopy(ifa->ifa_addr, ptr, len);
473 ptr += len;
474 buflen -= len;
475 }
476 break;
477#undef SA_SIZE
478 }
479
480 default:
481 error = EINVAL;
482 break;
483 } /* end of inner switch() */
484 break;
485 case NGM_FLOW_COOKIE:
486 switch (msg->header.cmd) {
487 case NGM_LINK_IS_UP:
488 if_link_state_change(ifp, LINK_STATE_UP);
489 break;
490 case NGM_LINK_IS_DOWN:
491 if_link_state_change(ifp, LINK_STATE_DOWN);
492 break;
493 default:
494 break;
495 }
496 break;
497 default:
498 error = EINVAL;
499 break;
500 }
501 NG_RESPOND_MSG(error, node, item, resp);
502 NG_FREE_MSG(msg);
503 return (error);
504}
505
506/*
507 * Receive data from a hook. Pass the packet to the ether_input routine.
508 */
509static int
510ng_eiface_rcvdata(hook_p hook, item_p item)
511{
512 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
513 struct ifnet *const ifp = priv->ifp;
514 struct mbuf *m;
515
516 NGI_GET_M(item, m);
517 NG_FREE_ITEM(item);
518
519 if (!((ifp->if_flags & IFF_UP) &&
520 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
521 NG_FREE_M(m);
522 return (ENETDOWN);
523 }
524
525 if (m->m_len < ETHER_HDR_LEN) {
526 m = m_pullup(m, ETHER_HDR_LEN);
527 if (m == NULL)
528 return (EINVAL);
529 }
530
531 /* Note receiving interface */
532 m->m_pkthdr.rcvif = ifp;
533
534 /* Update interface stats */
535 ifp->if_ipackets++;
536
537 (*ifp->if_input)(ifp, m);
538
539 /* Done */
540 return (0);
541}
542
543/*
544 * Shutdown processing.
545 */
546static int
547ng_eiface_rmnode(node_p node)
548{
549 const priv_p priv = NG_NODE_PRIVATE(node);
550 struct ifnet *const ifp = priv->ifp;
551
552 ether_ifdetach(ifp);
553 if_free(ifp);
554 free_unr(ng_eiface_unit, priv->unit);
fc025606 555 kfree(priv, M_NETGRAPH);
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556 NG_NODE_SET_PRIVATE(node, NULL);
557 NG_NODE_UNREF(node);
558 return (0);
559}
560
561/*
562 * Hook disconnection
563 */
564static int
565ng_eiface_disconnect(hook_p hook)
566{
567 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
568
569 priv->ether = NULL;
570 return (0);
571}
572
573/*
574 * Handle loading and unloading for this node type.
575 */
576static int
577ng_eiface_mod_event(module_t mod, int event, void *data)
578{
579 int error = 0;
580
581 switch (event) {
582 case MOD_LOAD:
583 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
584 break;
585 case MOD_UNLOAD:
586 delete_unrhdr(ng_eiface_unit);
587 break;
588 default:
589 error = EOPNOTSUPP;
590 break;
591 }
592 return (error);
593}