1 | /* |
2 | * Copyright (c) 2000-2021 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* $FreeBSD: src/sys/net/if_gif.c,v 1.4.2.6 2001/07/24 19:10:18 brooks Exp $ */ |
29 | /* $KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $ */ |
30 | |
31 | /* |
32 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
33 | * All rights reserved. |
34 | * |
35 | * Redistribution and use in source and binary forms, with or without |
36 | * modification, are permitted provided that the following conditions |
37 | * are met: |
38 | * 1. Redistributions of source code must retain the above copyright |
39 | * notice, this list of conditions and the following disclaimer. |
40 | * 2. Redistributions in binary form must reproduce the above copyright |
41 | * notice, this list of conditions and the following disclaimer in the |
42 | * documentation and/or other materials provided with the distribution. |
43 | * 3. Neither the name of the project nor the names of its contributors |
44 | * may be used to endorse or promote products derived from this software |
45 | * without specific prior written permission. |
46 | * |
47 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
48 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
49 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
50 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
51 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
52 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
53 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
54 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
55 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
56 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
57 | * SUCH DAMAGE. |
58 | */ |
59 | /* |
60 | * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce |
61 | * support for mandatory and extensible security protections. This notice |
62 | * is included in support of clause 2.2 (b) of the Apple Public License, |
63 | * Version 2.0. |
64 | */ |
65 | |
66 | #include <sys/param.h> |
67 | #include <sys/systm.h> |
68 | #include <sys/kernel.h> |
69 | #include <sys/malloc.h> |
70 | #include <sys/mbuf.h> |
71 | #include <sys/socket.h> |
72 | #include <sys/sockio.h> |
73 | #include <sys/errno.h> |
74 | #include <sys/time.h> |
75 | #include <sys/syslog.h> |
76 | #include <sys/protosw.h> |
77 | #include <kern/cpu_number.h> |
78 | #include <kern/zalloc.h> |
79 | |
80 | #include <net/if.h> |
81 | #include <net/if_types.h> |
82 | #include <net/route.h> |
83 | #include <net/bpf.h> |
84 | #include <net/kpi_protocol.h> |
85 | #include <net/kpi_interface.h> |
86 | #include <net/init.h> |
87 | |
88 | #include <netinet/in.h> |
89 | #include <netinet/in_systm.h> |
90 | #include <netinet/ip.h> |
91 | #if INET |
92 | #include <netinet/in_var.h> |
93 | #include <netinet/in_gif.h> |
94 | #include <netinet/ip_var.h> |
95 | #endif /* INET */ |
96 | |
97 | #include <netinet6/in6_var.h> |
98 | #include <netinet/ip6.h> |
99 | #include <netinet6/ip6_var.h> |
100 | #include <netinet6/in6_gif.h> |
101 | #include <netinet6/ip6protosw.h> |
102 | |
103 | #include <netinet/ip_encap.h> |
104 | #include <net/dlil.h> |
105 | #include <net/if_gif.h> |
106 | |
107 | #include <net/net_osdep.h> |
108 | |
109 | #include <net/sockaddr_utils.h> |
110 | |
111 | #define GIFNAME "gif" |
112 | #define GIFDEV "if_gif" |
113 | |
114 | #define GIF_MAXUNIT IF_MAXUNIT |
115 | #define GIF_ZONE_MAX_ELEM MIN(IFNETS_MAX, GIF_MAXUNIT) |
116 | |
117 | /* gif lock variables */ |
118 | static LCK_GRP_DECLARE(gif_mtx_grp, "gif" ); |
119 | static LCK_ATTR_DECLARE(gif_mtx_attr, 0, 0); |
120 | static LCK_MTX_DECLARE_ATTR(gif_mtx, &gif_mtx_grp, &gif_mtx_attr); |
121 | |
122 | TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs); |
123 | |
124 | static int gif_encapcheck(const struct mbuf *, int, int, void *); |
125 | static errno_t gif_output(ifnet_t ifp, mbuf_t m); |
126 | static errno_t gif_input(ifnet_t ifp, protocol_family_t protocol_family, |
127 | mbuf_t m, char *); |
128 | static errno_t gif_ioctl(ifnet_t ifp, u_long cmd, void *data); |
129 | |
130 | static int ngif = 0; /* number of interfaces */ |
131 | |
132 | #if INET |
133 | static struct protosw in_gif_protosw = |
134 | { |
135 | .pr_type = SOCK_RAW, |
136 | .pr_protocol = 0, /* IPPROTO_IPV[46] */ |
137 | .pr_flags = PR_ATOMIC | PR_ADDR, |
138 | .pr_input = in_gif_input, |
139 | .pr_usrreqs = &rip_usrreqs, |
140 | .pr_unlock = rip_unlock, |
141 | }; |
142 | #endif |
143 | static struct ip6protosw in6_gif_protosw = |
144 | { |
145 | .pr_type = SOCK_RAW, |
146 | .pr_protocol = 0, /* IPPROTO_IPV[46] */ |
147 | .pr_flags = PR_ATOMIC | PR_ADDR, |
148 | .pr_input = in6_gif_input, |
149 | .pr_usrreqs = &rip6_usrreqs, |
150 | .pr_unlock = rip_unlock, |
151 | }; |
152 | |
153 | static int gif_remove(struct ifnet *); |
154 | static int gif_clone_create(struct if_clone *, uint32_t, void *); |
155 | static int gif_clone_destroy(struct ifnet *); |
156 | static void gif_delete_tunnel(struct gif_softc *); |
157 | static void gif_detach(struct ifnet *); |
158 | |
159 | static struct if_clone gif_cloner = |
160 | IF_CLONE_INITIALIZER(GIFNAME, gif_clone_create, gif_clone_destroy, |
161 | 0, GIF_MAXUNIT); |
162 | /* |
163 | * Theory of operation: initially, one gif interface is created. |
164 | * Any time a gif interface is configured, if there are no other |
165 | * unconfigured gif interfaces, a new gif interface is created. |
166 | * BSD uses the clone mechanism to dynamically create more |
167 | * gif interfaces. |
168 | * |
169 | * We have some extra glue to support DLIL. |
170 | */ |
171 | |
172 | /* GIF interface module support */ |
173 | static int |
174 | gif_demux( |
175 | ifnet_t ifp, |
176 | __unused mbuf_t m, |
177 | __unused char *, |
178 | protocol_family_t *protocol_family) |
179 | { |
180 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
181 | |
182 | GIF_LOCK(sc); |
183 | /* Only one protocol may be attached to a gif interface. */ |
184 | *protocol_family = sc->gif_proto; |
185 | GIF_UNLOCK(sc); |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | static errno_t |
191 | gif_add_proto( |
192 | ifnet_t ifp, |
193 | protocol_family_t protocol_family, |
194 | __unused const struct ifnet_demux_desc *demux_array, |
195 | __unused u_int32_t demux_count) |
196 | { |
197 | /* Only one protocol may be attached at a time */ |
198 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
199 | |
200 | GIF_LOCK(sc); |
201 | if (sc->gif_proto != 0) { |
202 | printf("gif_add_proto: request add_proto for gif%d\n" , |
203 | ifnet_unit(interface: ifp)); |
204 | } |
205 | |
206 | sc->gif_proto = protocol_family; |
207 | GIF_UNLOCK(sc); |
208 | |
209 | return 0; |
210 | } |
211 | |
212 | static errno_t |
213 | gif_del_proto( |
214 | ifnet_t ifp, |
215 | protocol_family_t protocol_family) |
216 | { |
217 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
218 | |
219 | GIF_LOCK(sc); |
220 | if (sc->gif_proto == protocol_family) { |
221 | sc->gif_proto = 0; |
222 | } |
223 | GIF_UNLOCK(sc); |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | /* Glue code to attach inet to a gif interface through DLIL */ |
229 | static errno_t |
230 | gif_attach_proto_family( |
231 | ifnet_t ifp, |
232 | protocol_family_t protocol_family) |
233 | { |
234 | struct ifnet_attach_proto_param reg; |
235 | errno_t stat; |
236 | |
237 | bzero(s: ®, n: sizeof(reg)); |
238 | reg.input = gif_input; |
239 | |
240 | stat = ifnet_attach_protocol(interface: ifp, protocol_family, proto_details: ®); |
241 | if (stat && stat != EEXIST) { |
242 | printf("gif_attach_proto_family can't attach interface \ |
243 | fam=%d\n" , protocol_family); |
244 | } |
245 | |
246 | return stat; |
247 | } |
248 | |
249 | /* Function to setup the first gif interface */ |
250 | void |
251 | gif_init(void) |
252 | { |
253 | errno_t result; |
254 | |
255 | /* Initialize the list of interfaces */ |
256 | TAILQ_INIT(&gifs); |
257 | |
258 | /* Register protocol registration functions */ |
259 | result = proto_register_plumber(PF_INET, APPLE_IF_FAM_GIF, |
260 | plumb: gif_attach_proto_family, NULL); |
261 | if (result != 0) { |
262 | printf("proto_register_plumber failed for AF_INET error=%d\n" , |
263 | result); |
264 | } |
265 | |
266 | result = proto_register_plumber(PF_INET6, APPLE_IF_FAM_GIF, |
267 | plumb: gif_attach_proto_family, NULL); |
268 | if (result != 0) { |
269 | printf("proto_register_plumber failed for AF_INET6 error=%d\n" , |
270 | result); |
271 | } |
272 | |
273 | result = if_clone_attach(&gif_cloner); |
274 | if (result != 0) { |
275 | panic("%s: if_clone_attach() failed, error %d" , __func__, result); |
276 | } |
277 | |
278 | gif_clone_create(&gif_cloner, 0, NULL); |
279 | } |
280 | |
281 | static errno_t |
282 | gif_set_bpf_tap( |
283 | ifnet_t ifp, |
284 | bpf_tap_mode mode, |
285 | bpf_packet_func callback) |
286 | { |
287 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
288 | |
289 | GIF_LOCK(sc); |
290 | sc->tap_mode = mode; |
291 | sc->tap_callback = callback; |
292 | GIF_UNLOCK(sc); |
293 | |
294 | return 0; |
295 | } |
296 | |
297 | static void |
298 | gif_detach(struct ifnet *ifp) |
299 | { |
300 | struct gif_softc *sc = ifp->if_softc; |
301 | lck_mtx_destroy(lck: &sc->gif_lock, grp: &gif_mtx_grp); |
302 | kfree_type(struct gif_softc, sc); |
303 | ifp->if_softc = NULL; |
304 | (void) ifnet_release(interface: ifp); |
305 | } |
306 | |
307 | static int |
308 | gif_clone_create(struct if_clone *ifc, uint32_t unit, __unused void *params) |
309 | { |
310 | struct gif_softc *sc = NULL; |
311 | struct ifnet_init_eparams gif_init_params; |
312 | errno_t error = 0; |
313 | |
314 | lck_mtx_lock(lck: &gif_mtx); |
315 | |
316 | /* Can't create more than GIF_MAXUNIT */ |
317 | if (ngif >= GIF_MAXUNIT) { |
318 | error = ENXIO; |
319 | goto done; |
320 | } |
321 | |
322 | sc = kalloc_type(struct gif_softc, Z_WAITOK_ZERO_NOFAIL); |
323 | |
324 | /* use the interface name as the unique id for ifp recycle */ |
325 | snprintf(sc->gif_ifname, count: sizeof(sc->gif_ifname), "%s%d" , |
326 | ifc->ifc_name, unit); |
327 | |
328 | lck_mtx_init(lck: &sc->gif_lock, grp: &gif_mtx_grp, attr: &gif_mtx_attr); |
329 | |
330 | bzero(s: &gif_init_params, n: sizeof(gif_init_params)); |
331 | gif_init_params.ver = IFNET_INIT_CURRENT_VERSION; |
332 | gif_init_params.len = sizeof(gif_init_params); |
333 | gif_init_params.flags = IFNET_INIT_LEGACY; |
334 | gif_init_params.uniqueid = sc->gif_ifname; |
335 | gif_init_params.uniqueid_len = strlen(s: sc->gif_ifname); |
336 | gif_init_params.name = GIFNAME; |
337 | gif_init_params.unit = unit; |
338 | gif_init_params.type = IFT_GIF; |
339 | gif_init_params.family = IFNET_FAMILY_GIF; |
340 | gif_init_params.output = gif_output; |
341 | gif_init_params.demux = gif_demux; |
342 | gif_init_params.add_proto = gif_add_proto; |
343 | gif_init_params.del_proto = gif_del_proto; |
344 | gif_init_params.softc = sc; |
345 | gif_init_params.ioctl = gif_ioctl; |
346 | gif_init_params.set_bpf_tap = gif_set_bpf_tap; |
347 | gif_init_params.detach = gif_detach; |
348 | |
349 | error = ifnet_allocate_extended(init: &gif_init_params, interface: &sc->gif_if); |
350 | if (error != 0) { |
351 | printf("gif_clone_create, ifnet_allocate failed - %d\n" , error); |
352 | kfree_type(struct gif_softc, sc); |
353 | error = ENOBUFS; |
354 | goto done; |
355 | } |
356 | |
357 | sc->encap_cookie4 = sc->encap_cookie6 = NULL; |
358 | #if INET |
359 | sc->encap_cookie4 = encap_attach_func(AF_INET, -1, |
360 | gif_encapcheck, &in_gif_protosw, sc); |
361 | if (sc->encap_cookie4 == NULL) { |
362 | printf("%s: unable to attach encap4\n" , if_name(sc->gif_if)); |
363 | ifnet_release(interface: sc->gif_if); |
364 | kfree_type(struct gif_softc, sc); |
365 | error = ENOBUFS; |
366 | goto done; |
367 | } |
368 | #endif |
369 | sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, |
370 | gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); |
371 | if (sc->encap_cookie6 == NULL) { |
372 | if (sc->encap_cookie4) { |
373 | encap_detach(sc->encap_cookie4); |
374 | sc->encap_cookie4 = NULL; |
375 | } |
376 | printf("%s: unable to attach encap6\n" , if_name(sc->gif_if)); |
377 | ifnet_release(interface: sc->gif_if); |
378 | kfree_type(struct gif_softc, sc); |
379 | error = ENOBUFS; |
380 | goto done; |
381 | } |
382 | sc->gif_called = 0; |
383 | ifnet_set_mtu(interface: sc->gif_if, GIF_MTU); |
384 | ifnet_set_flags(interface: sc->gif_if, IFF_POINTOPOINT | IFF_MULTICAST, mask: 0xffff); |
385 | sc->gif_flags |= IFGIF_DETACHING; |
386 | error = ifnet_attach(interface: sc->gif_if, NULL); |
387 | if (error != 0) { |
388 | printf("gif_clone_create - ifnet_attach failed - %d\n" , error); |
389 | ifnet_release(interface: sc->gif_if); |
390 | if (sc->encap_cookie4) { |
391 | encap_detach(sc->encap_cookie4); |
392 | sc->encap_cookie4 = NULL; |
393 | } |
394 | if (sc->encap_cookie6) { |
395 | encap_detach(sc->encap_cookie6); |
396 | sc->encap_cookie6 = NULL; |
397 | } |
398 | kfree_type(struct gif_softc, sc); |
399 | goto done; |
400 | } |
401 | bpfattach(interface: sc->gif_if, DLT_NULL, header_length: sizeof(u_int)); |
402 | sc->gif_flags &= ~IFGIF_DETACHING; |
403 | TAILQ_INSERT_TAIL(&gifs, sc, gif_link); |
404 | ngif++; |
405 | done: |
406 | lck_mtx_unlock(lck: &gif_mtx); |
407 | |
408 | return error; |
409 | } |
410 | |
411 | static int |
412 | gif_remove(struct ifnet *ifp) |
413 | { |
414 | int error = 0; |
415 | struct gif_softc *sc = NULL; |
416 | const struct encaptab *encap_cookie4 = NULL; |
417 | const struct encaptab *encap_cookie6 = NULL; |
418 | |
419 | lck_mtx_lock(lck: &gif_mtx); |
420 | sc = ifp->if_softc; |
421 | |
422 | if (sc == NULL) { |
423 | error = EINVAL; |
424 | goto done; |
425 | } |
426 | |
427 | GIF_LOCK(sc); |
428 | if (sc->gif_flags & IFGIF_DETACHING) { |
429 | error = EINVAL; |
430 | goto done; |
431 | } |
432 | |
433 | sc->gif_flags |= IFGIF_DETACHING; |
434 | TAILQ_REMOVE(&gifs, sc, gif_link); |
435 | ngif--; |
436 | |
437 | gif_delete_tunnel(sc); |
438 | encap_cookie6 = sc->encap_cookie6; |
439 | #ifdef INET |
440 | encap_cookie4 = sc->encap_cookie4; |
441 | #endif |
442 | done: |
443 | if (sc != NULL) { |
444 | GIF_UNLOCK(sc); |
445 | } |
446 | lck_mtx_unlock(lck: &gif_mtx); |
447 | |
448 | if (encap_cookie6 != NULL) { |
449 | error = encap_detach(encap_cookie6); |
450 | KASSERT(error == 0, ("gif_clone_destroy: Unexpected " |
451 | "error detaching encap_cookie6" )); |
452 | } |
453 | |
454 | if (encap_cookie4 != NULL) { |
455 | error = encap_detach(encap_cookie4); |
456 | KASSERT(error == 0, ("gif_clone_destroy: Unexpected " |
457 | "error detaching encap_cookie4" )); |
458 | } |
459 | |
460 | return error; |
461 | } |
462 | |
463 | static int |
464 | gif_clone_destroy(struct ifnet *ifp) |
465 | { |
466 | int error = 0; |
467 | |
468 | error = gif_remove(ifp); |
469 | if (error != 0) { |
470 | printf("gif_clone_destroy: gif remove failed %d\n" , error); |
471 | return error; |
472 | } |
473 | |
474 | error = ifnet_set_flags(interface: ifp, new_flags: 0, IFF_UP); |
475 | if (error != 0) { |
476 | printf("gif_clone_destroy: ifnet_set_flags failed %d\n" , error); |
477 | } |
478 | |
479 | error = ifnet_detach(interface: ifp); |
480 | if (error != 0) { |
481 | panic("gif_clone_destroy: ifnet_detach(%p) failed %d" , ifp, |
482 | error); |
483 | } |
484 | return 0; |
485 | } |
486 | |
487 | static int |
488 | gif_encapcheck( |
489 | const struct mbuf *m, |
490 | int off, |
491 | int proto, |
492 | void *arg) |
493 | { |
494 | int error = 0; |
495 | struct ip ip; |
496 | struct gif_softc *sc; |
497 | |
498 | sc = (struct gif_softc *)arg; |
499 | if (sc == NULL) { |
500 | return error; |
501 | } |
502 | |
503 | GIF_LOCK(sc); |
504 | if ((ifnet_flags(interface: sc->gif_if) & IFF_UP) == 0) { |
505 | goto done; |
506 | } |
507 | |
508 | /* no physical address */ |
509 | if (!sc->gif_psrc || !sc->gif_pdst) { |
510 | goto done; |
511 | } |
512 | |
513 | switch (proto) { |
514 | #if INET |
515 | case IPPROTO_IPV4: |
516 | break; |
517 | #endif |
518 | case IPPROTO_IPV6: |
519 | break; |
520 | default: |
521 | goto done; |
522 | } |
523 | |
524 | mbuf_copydata(mbuf: (struct mbuf *)(size_t)m, offset: 0, length: sizeof(ip), out_data: &ip); |
525 | |
526 | switch (ip.ip_v) { |
527 | #if INET |
528 | case 4: |
529 | if (sc->gif_psrc->sa_family != AF_INET || |
530 | sc->gif_pdst->sa_family != AF_INET) { |
531 | goto done; |
532 | } |
533 | error = gif_encapcheck4(m, off, proto, arg); |
534 | #endif |
535 | OS_FALLTHROUGH; |
536 | case 6: |
537 | if (sc->gif_psrc->sa_family != AF_INET6 || |
538 | sc->gif_pdst->sa_family != AF_INET6) { |
539 | goto done; |
540 | } |
541 | error = gif_encapcheck6(m, off, proto, arg); |
542 | OS_FALLTHROUGH; |
543 | default: |
544 | goto done; |
545 | } |
546 | done: |
547 | GIF_UNLOCK(sc); |
548 | return error; |
549 | } |
550 | |
551 | static errno_t |
552 | gif_output( |
553 | ifnet_t ifp, |
554 | mbuf_t m) |
555 | { |
556 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
557 | struct sockaddr *gif_psrc; |
558 | struct sockaddr *gif_pdst; |
559 | int error = 0; |
560 | |
561 | GIF_LOCK(sc); |
562 | gif_psrc = sc->gif_psrc; |
563 | gif_pdst = sc->gif_pdst; |
564 | GIF_UNLOCK(sc); |
565 | |
566 | /* |
567 | * max_gif_nesting check used to live here. It doesn't anymore |
568 | * because there is no guaruntee that we won't be called |
569 | * concurrently from more than one thread. |
570 | */ |
571 | m->m_flags &= ~(M_BCAST | M_MCAST); |
572 | if (!(ifnet_flags(interface: ifp) & IFF_UP) || |
573 | gif_psrc == NULL || gif_pdst == NULL) { |
574 | ifnet_touch_lastchange(interface: ifp); |
575 | m_freem(m); /* free it here not in dlil_output */ |
576 | error = ENETDOWN; |
577 | goto end; |
578 | } |
579 | |
580 | bpf_tap_out(interface: ifp, dlt: 0, packet: m, header: &sc->gif_proto, header_len: sizeof(sc->gif_proto)); |
581 | |
582 | GIF_LOCK(sc); |
583 | |
584 | /* inner AF-specific encapsulation */ |
585 | |
586 | /* XXX should we check if our outer source is legal? */ |
587 | |
588 | /* |
589 | * Save the length as m may be free by the output functions |
590 | * as they call m_pullup |
591 | */ |
592 | u_int32_t bytes_out = m->m_pkthdr.len; |
593 | |
594 | /* dispatch to output logic based on outer AF */ |
595 | switch (sc->gif_psrc->sa_family) { |
596 | #if INET |
597 | case AF_INET: |
598 | error = in_gif_output(ifp, sc->gif_proto, m, NULL); |
599 | break; |
600 | #endif |
601 | case AF_INET6: |
602 | error = in6_gif_output(ifp, sc->gif_proto, m, NULL); |
603 | break; |
604 | default: |
605 | error = ENETDOWN; |
606 | break; |
607 | } |
608 | |
609 | GIF_UNLOCK(sc); |
610 | end: |
611 | if (error) { |
612 | /* the mbuf was freed either by in_gif_output or in here */ |
613 | ifnet_stat_increment_out(interface: ifp, packets_out: 0, bytes_out: 0, errors_out: 1); |
614 | } else { |
615 | ifnet_stat_increment_out(interface: ifp, packets_out: 1, bytes_out, errors_out: 0); |
616 | } |
617 | if (error == 0) { |
618 | error = EJUSTRETURN; /* if no error, packet got sent already */ |
619 | } |
620 | return error; |
621 | } |
622 | |
623 | /* |
624 | * gif_input is the input handler for IP and IPv6 attached to gif |
625 | */ |
626 | static errno_t |
627 | gif_input( |
628 | ifnet_t ifp, |
629 | protocol_family_t protocol_family, |
630 | mbuf_t m, |
631 | __unused char *) |
632 | { |
633 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
634 | |
635 | bpf_tap_in(interface: ifp, dlt: 0, packet: m, header: &sc->gif_proto, header_len: sizeof(sc->gif_proto)); |
636 | |
637 | /* |
638 | * Put the packet to the network layer input queue according to the |
639 | * specified address family. |
640 | * Note: older versions of gif_input directly called network layer |
641 | * input functions, e.g. ip6_input, here. We changed the policy to |
642 | * prevent too many recursive calls of such input functions, which |
643 | * might cause kernel panic. But the change may introduce another |
644 | * problem; if the input queue is full, packets are discarded. |
645 | * We believed it rarely occurs and changed the policy. If we find |
646 | * it occurs more times than we thought, we may change the policy |
647 | * again. |
648 | */ |
649 | int32_t pktlen = m->m_pkthdr.len; |
650 | if (proto_input(protocol: protocol_family, packet: m) != 0) { |
651 | ifnet_stat_increment_in(interface: ifp, packets_in: 0, bytes_in: 0, errors_in: 1); |
652 | m_freem(m); |
653 | } else { |
654 | ifnet_stat_increment_in(interface: ifp, packets_in: 1, bytes_in: pktlen, errors_in: 0); |
655 | } |
656 | |
657 | return 0; |
658 | } |
659 | |
660 | /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ |
661 | static errno_t |
662 | gif_ioctl( |
663 | ifnet_t ifp, |
664 | u_long cmd, |
665 | void *data) |
666 | { |
667 | struct gif_softc *sc = ifnet_softc(interface: ifp); |
668 | struct ifreq *ifr = (struct ifreq *)data; |
669 | int error = 0, size; |
670 | struct sockaddr *dst = NULL, *src = NULL; |
671 | struct sockaddr *sa; |
672 | struct ifnet *ifp2; |
673 | struct gif_softc *sc2; |
674 | |
675 | switch (cmd) { |
676 | case SIOCSIFADDR: |
677 | break; |
678 | |
679 | case SIOCSIFDSTADDR: |
680 | break; |
681 | |
682 | case SIOCADDMULTI: |
683 | case SIOCDELMULTI: |
684 | break; |
685 | |
686 | #ifdef SIOCSIFMTU /* xxx */ |
687 | case SIOCGIFMTU: |
688 | break; |
689 | |
690 | case SIOCSIFMTU: |
691 | { |
692 | u_int32_t mtu; |
693 | mtu = ifr->ifr_mtu; |
694 | if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { |
695 | return EINVAL; |
696 | } |
697 | ifnet_set_mtu(interface: ifp, mtu); |
698 | } |
699 | break; |
700 | #endif /* SIOCSIFMTU */ |
701 | |
702 | case SIOCSIFPHYADDR: |
703 | case SIOCSIFPHYADDR_IN6_32: |
704 | case SIOCSIFPHYADDR_IN6_64: |
705 | switch (cmd) { |
706 | #if INET |
707 | case SIOCSIFPHYADDR: { |
708 | struct in_aliasreq *ifra = |
709 | (struct in_aliasreq*)data; |
710 | |
711 | src = SA(&ifra->ifra_addr); |
712 | dst = SA(&ifra->ifra_dstaddr); |
713 | break; |
714 | } |
715 | #endif |
716 | case SIOCSIFPHYADDR_IN6_32: { |
717 | struct in6_aliasreq_32 *ifra_32 = |
718 | (struct in6_aliasreq_32 *)data; |
719 | |
720 | src = SA(&ifra_32->ifra_addr); |
721 | dst = SA(&ifra_32->ifra_dstaddr); |
722 | break; |
723 | } |
724 | |
725 | case SIOCSIFPHYADDR_IN6_64: { |
726 | struct in6_aliasreq_64 *ifra_64 = |
727 | (struct in6_aliasreq_64 *)data; |
728 | |
729 | src = SA(&ifra_64->ifra_addr); |
730 | dst = SA(&ifra_64->ifra_dstaddr); |
731 | break; |
732 | } |
733 | } |
734 | |
735 | /* sa_family must be equal */ |
736 | if (src->sa_family != dst->sa_family) { |
737 | return EINVAL; |
738 | } |
739 | |
740 | /* validate sa_len */ |
741 | switch (src->sa_family) { |
742 | #if INET |
743 | case AF_INET: |
744 | if (src->sa_len != sizeof(struct sockaddr_in)) { |
745 | return EINVAL; |
746 | } |
747 | break; |
748 | #endif |
749 | case AF_INET6: |
750 | if (src->sa_len != sizeof(struct sockaddr_in6)) { |
751 | return EINVAL; |
752 | } |
753 | break; |
754 | default: |
755 | return EAFNOSUPPORT; |
756 | } |
757 | switch (dst->sa_family) { |
758 | #if INET |
759 | case AF_INET: |
760 | if (dst->sa_len != sizeof(struct sockaddr_in)) { |
761 | return EINVAL; |
762 | } |
763 | break; |
764 | #endif |
765 | case AF_INET6: |
766 | if (dst->sa_len != sizeof(struct sockaddr_in6)) { |
767 | return EINVAL; |
768 | } |
769 | break; |
770 | default: |
771 | return EAFNOSUPPORT; |
772 | } |
773 | |
774 | /* check sa_family looks sane for the cmd */ |
775 | switch (cmd) { |
776 | case SIOCSIFPHYADDR: |
777 | if (src->sa_family == AF_INET) { |
778 | break; |
779 | } |
780 | return EAFNOSUPPORT; |
781 | case SIOCSIFPHYADDR_IN6_32: |
782 | case SIOCSIFPHYADDR_IN6_64: |
783 | if (src->sa_family == AF_INET6) { |
784 | break; |
785 | } |
786 | return EAFNOSUPPORT; |
787 | } |
788 | |
789 | #define GIF_ORDERED_LOCK(sc, sc2) \ |
790 | if (sc < sc2) { \ |
791 | GIF_LOCK(sc); \ |
792 | GIF_LOCK(sc2); \ |
793 | } else { \ |
794 | GIF_LOCK(sc2); \ |
795 | GIF_LOCK(sc); \ |
796 | } |
797 | |
798 | #define GIF_ORDERED_UNLOCK(sc, sc2) \ |
799 | if (sc > sc2) { \ |
800 | GIF_UNLOCK(sc); \ |
801 | GIF_UNLOCK(sc2); \ |
802 | } else { \ |
803 | GIF_UNLOCK(sc2); \ |
804 | GIF_UNLOCK(sc); \ |
805 | } |
806 | |
807 | ifnet_head_lock_shared(); |
808 | TAILQ_FOREACH(ifp2, &ifnet_head, if_link) { |
809 | if (strcmp(s1: ifnet_name(interface: ifp2), GIFNAME) != 0) { |
810 | continue; |
811 | } |
812 | sc2 = ifnet_softc(interface: ifp2); |
813 | if (sc2 == sc) { |
814 | continue; |
815 | } |
816 | /* lock sc and sc2 in increasing order of ifnet index */ |
817 | GIF_ORDERED_LOCK(sc, sc2); |
818 | if (!sc2->gif_pdst || !sc2->gif_psrc) { |
819 | GIF_ORDERED_UNLOCK(sc, sc2); |
820 | continue; |
821 | } |
822 | if (sc2->gif_pdst->sa_family != dst->sa_family || |
823 | sc2->gif_pdst->sa_len != dst->sa_len || |
824 | sc2->gif_psrc->sa_family != src->sa_family || |
825 | sc2->gif_psrc->sa_len != src->sa_len) { |
826 | GIF_ORDERED_UNLOCK(sc, sc2); |
827 | continue; |
828 | } |
829 | #ifndef XBONEHACK |
830 | /* can't configure same pair of address onto two gifs */ |
831 | if (SOCKADDR_CMP(sc2->gif_pdst, dst, dst->sa_len) == 0 && |
832 | SOCKADDR_CMP(sc2->gif_psrc, src, src->sa_len) == 0) { |
833 | GIF_ORDERED_UNLOCK(sc, sc2); |
834 | error = EADDRNOTAVAIL; |
835 | ifnet_head_done(); |
836 | goto bad; |
837 | } |
838 | #endif |
839 | |
840 | /* can't configure multiple multi-dest interfaces */ |
841 | #define multidest(x) \ |
842 | (((struct sockaddr_in *)(void *)(x))->sin_addr.s_addr == INADDR_ANY) |
843 | #define multidest6(x) \ |
844 | (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) \ |
845 | (void *)(x))->sin6_addr)) |
846 | if (dst->sa_family == AF_INET && |
847 | multidest(dst) && multidest(sc2->gif_pdst)) { |
848 | GIF_ORDERED_UNLOCK(sc, sc2); |
849 | error = EADDRNOTAVAIL; |
850 | ifnet_head_done(); |
851 | goto bad; |
852 | } |
853 | if (dst->sa_family == AF_INET6 && |
854 | multidest6(dst) && multidest6(sc2->gif_pdst)) { |
855 | GIF_ORDERED_UNLOCK(sc, sc2); |
856 | error = EADDRNOTAVAIL; |
857 | ifnet_head_done(); |
858 | goto bad; |
859 | } |
860 | GIF_ORDERED_UNLOCK(sc, sc2); |
861 | } |
862 | ifnet_head_done(); |
863 | |
864 | GIF_LOCK(sc); |
865 | if (sc->gif_psrc) { |
866 | kfree_data(sc->gif_psrc, sc->gif_psrc->sa_len); |
867 | } |
868 | sa = SA(kalloc_data(src->sa_len, Z_WAITOK)); |
869 | if (sa == NULL) { |
870 | GIF_UNLOCK(sc); |
871 | return ENOBUFS; |
872 | } |
873 | bcopy(src: (caddr_t)src, dst: (caddr_t)sa, n: src->sa_len); |
874 | sc->gif_psrc = sa; |
875 | |
876 | if (sc->gif_pdst) { |
877 | kfree_data(sc->gif_pdst, sc->gif_pdst->sa_len); |
878 | } |
879 | sa = SA(kalloc_data(dst->sa_len, Z_WAITOK)); |
880 | if (sa == NULL) { |
881 | GIF_UNLOCK(sc); |
882 | return ENOBUFS; |
883 | } |
884 | bcopy(src: (caddr_t)dst, dst: (caddr_t)sa, n: dst->sa_len); |
885 | sc->gif_pdst = sa; |
886 | GIF_UNLOCK(sc); |
887 | |
888 | ifnet_set_flags(interface: ifp, IFF_RUNNING | IFF_UP, IFF_RUNNING | |
889 | IFF_UP); |
890 | |
891 | error = 0; |
892 | break; |
893 | |
894 | #ifdef SIOCDIFPHYADDR |
895 | case SIOCDIFPHYADDR: |
896 | GIF_LOCK(sc); |
897 | if (sc->gif_psrc) { |
898 | kfree_data(sc->gif_psrc, sc->gif_psrc->sa_len); |
899 | sc->gif_psrc = NULL; |
900 | } |
901 | if (sc->gif_pdst) { |
902 | kfree_data(sc->gif_pdst, sc->gif_pdst->sa_len); |
903 | sc->gif_pdst = NULL; |
904 | } |
905 | GIF_UNLOCK(sc); |
906 | /* change the IFF_{UP, RUNNING} flag as well? */ |
907 | break; |
908 | #endif |
909 | |
910 | case SIOCGIFPSRCADDR: |
911 | case SIOCGIFPSRCADDR_IN6: |
912 | GIF_LOCK(sc); |
913 | if (sc->gif_psrc == NULL) { |
914 | GIF_UNLOCK(sc); |
915 | error = EADDRNOTAVAIL; |
916 | goto bad; |
917 | } |
918 | src = sc->gif_psrc; |
919 | switch (cmd) { |
920 | #if INET |
921 | case SIOCGIFPSRCADDR: |
922 | dst = &ifr->ifr_addr; |
923 | size = sizeof(ifr->ifr_addr); |
924 | break; |
925 | #endif /* INET */ |
926 | case SIOCGIFPSRCADDR_IN6: { |
927 | struct in6_ifreq *ifreq = |
928 | (struct in6_ifreq*)data; |
929 | |
930 | dst = SA(&ifreq->ifr_addr); |
931 | size = sizeof(ifreq->ifr_addr); |
932 | break; |
933 | } |
934 | default: |
935 | GIF_UNLOCK(sc); |
936 | error = EADDRNOTAVAIL; |
937 | goto bad; |
938 | } |
939 | if (src->sa_len > size) { |
940 | GIF_UNLOCK(sc); |
941 | return EINVAL; |
942 | } |
943 | bcopy(src: (caddr_t)src, dst: (caddr_t)dst, n: src->sa_len); |
944 | GIF_UNLOCK(sc); |
945 | break; |
946 | |
947 | case SIOCGIFPDSTADDR: |
948 | case SIOCGIFPDSTADDR_IN6: |
949 | GIF_LOCK(sc); |
950 | if (sc->gif_pdst == NULL) { |
951 | GIF_UNLOCK(sc); |
952 | error = EADDRNOTAVAIL; |
953 | goto bad; |
954 | } |
955 | src = sc->gif_pdst; |
956 | switch (cmd) { |
957 | #if INET |
958 | case SIOCGIFPDSTADDR: |
959 | dst = &ifr->ifr_addr; |
960 | size = sizeof(ifr->ifr_addr); |
961 | break; |
962 | #endif /* INET */ |
963 | case SIOCGIFPDSTADDR_IN6: { |
964 | struct in6_ifreq *ifreq = |
965 | (struct in6_ifreq*)data; |
966 | |
967 | dst = SA(&ifreq->ifr_addr); |
968 | size = sizeof(ifreq->ifr_addr); |
969 | break; |
970 | } |
971 | default: |
972 | error = EADDRNOTAVAIL; |
973 | GIF_UNLOCK(sc); |
974 | goto bad; |
975 | } |
976 | if (src->sa_len > size) { |
977 | GIF_UNLOCK(sc); |
978 | return EINVAL; |
979 | } |
980 | bcopy(src: (caddr_t)src, dst: (caddr_t)dst, n: src->sa_len); |
981 | GIF_UNLOCK(sc); |
982 | break; |
983 | |
984 | case SIOCSIFFLAGS: |
985 | /* if_ioctl() takes care of it */ |
986 | break; |
987 | |
988 | default: |
989 | error = EOPNOTSUPP; |
990 | break; |
991 | } |
992 | bad: |
993 | return error; |
994 | } |
995 | |
996 | static void |
997 | gif_delete_tunnel(struct gif_softc *sc) |
998 | { |
999 | GIF_LOCK_ASSERT(sc); |
1000 | if (sc->gif_psrc) { |
1001 | kfree_data(sc->gif_psrc, sc->gif_psrc->sa_len); |
1002 | sc->gif_psrc = NULL; |
1003 | } |
1004 | if (sc->gif_pdst) { |
1005 | kfree_data(sc->gif_pdst, sc->gif_pdst->sa_len); |
1006 | sc->gif_pdst = NULL; |
1007 | } |
1008 | ROUTE_RELEASE(&sc->gif_ro); |
1009 | /* change the IFF_UP flag as well? */ |
1010 | } |
1011 | |