1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 */
30
31 #include <sys/cdefs.h>
32 #include "opt_capsicum.h"
33 #include "opt_sctp.h"
34 #include "opt_ktrace.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/capsicum.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/sysproto.h>
43 #include <sys/malloc.h>
44 #include <sys/filedesc.h>
45 #include <sys/event.h>
46 #include <sys/proc.h>
47 #include <sys/fcntl.h>
48 #include <sys/file.h>
49 #include <sys/filio.h>
50 #include <sys/jail.h>
51 #include <sys/mount.h>
52 #include <sys/mbuf.h>
53 #include <sys/protosw.h>
54 #include <sys/sf_buf.h>
55 #include <sys/sysent.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/signalvar.h>
59 #include <sys/syscall.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/uio.h>
63 #include <sys/vnode.h>
64 #ifdef KTRACE
65 #include <sys/ktrace.h>
66 #endif
67 #ifdef COMPAT_FREEBSD32
68 #include <compat/freebsd32/freebsd32.h>
69 #include <compat/freebsd32/freebsd32_syscall.h>
70 #include <compat/freebsd32/freebsd32_util.h>
71 #endif
72
73 #include <net/vnet.h>
74
75 #include <security/audit/audit.h>
76 #include <security/mac/mac_framework.h>
77
78 #include <netinet/sctp.h>
79 #include <netinet/sctp_os_bsd.h>
80 #include <netinet/sctp_peeloff.h>
81
82 static struct syscall_helper_data sctp_syscalls[] = {
83 SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED),
84 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED),
85 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED),
86 SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED),
87 SYSCALL_INIT_LAST
88 };
89
90 #ifdef COMPAT_FREEBSD32
91 static struct syscall_helper_data sctp32_syscalls[] = {
92 SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff),
93 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg),
94 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov),
95 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg),
96 SYSCALL_INIT_LAST
97 };
98 #endif
99
100 int
sctp_syscalls_init(void)101 sctp_syscalls_init(void)
102 {
103 int error;
104
105 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD);
106 if (error != 0)
107 return (error);
108 #ifdef COMPAT_FREEBSD32
109 error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD);
110 if (error != 0)
111 return (error);
112 #endif
113 return (0);
114 }
115
116 #ifdef SCTP
117 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
118 #endif
119
120 int
sctp_syscalls_uninit(void)121 sctp_syscalls_uninit(void)
122 {
123 int error;
124
125 #ifdef COMPAT_FREEBSD32
126 error = syscall32_helper_unregister(sctp32_syscalls);
127 if (error != 0)
128 return (error);
129 #endif
130 error = syscall_helper_unregister(sctp_syscalls);
131 if (error != 0)
132 return (error);
133 return (0);
134 }
135
136 /*
137 * SCTP syscalls.
138 */
139 int
sys_sctp_peeloff(struct thread * td,struct sctp_peeloff_args * uap)140 sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap)
141 {
142 struct file *headfp, *nfp = NULL;
143 struct socket *head, *so;
144 cap_rights_t rights;
145 u_int fflag;
146 int error, fd;
147
148 AUDIT_ARG_FD(uap->sd);
149 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF),
150 &headfp);
151 if (error != 0)
152 goto done2;
153 fflag = atomic_load_int(&headfp->f_flag);
154 head = headfp->f_data;
155 if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
156 error = EOPNOTSUPP;
157 goto done;
158 }
159 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
160 if (error != 0)
161 goto done;
162 /*
163 * At this point we know we do have a assoc to pull
164 * we proceed to get the fd setup. This may block
165 * but that is ok.
166 */
167
168 error = falloc(td, &nfp, &fd, 0);
169 if (error != 0)
170 goto done;
171 td->td_retval[0] = fd;
172
173 CURVNET_SET(head->so_vnet);
174 so = sopeeloff(head);
175 if (so == NULL) {
176 error = ENOMEM;
177 goto noconnection;
178 }
179 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
180 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
181 if (error != 0)
182 goto noconnection;
183 if (head->so_sigio != NULL)
184 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
185
186 noconnection:
187 /*
188 * close the new descriptor, assuming someone hasn't ripped it
189 * out from under us.
190 */
191 if (error != 0)
192 fdclose(td, nfp, fd);
193
194 /*
195 * Release explicitly held references before returning.
196 */
197 CURVNET_RESTORE();
198 done:
199 if (nfp != NULL)
200 fdrop(nfp, td);
201 fdrop(headfp, td);
202 done2:
203 return (error);
204 }
205
206 int
sys_sctp_generic_sendmsg(struct thread * td,struct sctp_generic_sendmsg_args * uap)207 sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap)
208 {
209 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
210 struct socket *so;
211 struct file *fp = NULL;
212 struct sockaddr *to = NULL;
213 #ifdef KTRACE
214 struct uio *ktruio = NULL;
215 #endif
216 struct uio auio;
217 struct iovec iov[1];
218 cap_rights_t rights;
219 int error = 0, len;
220
221 if (uap->sinfo != NULL) {
222 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
223 if (error != 0)
224 return (error);
225 u_sinfo = &sinfo;
226 }
227
228 cap_rights_init_one(&rights, CAP_SEND);
229 if (uap->tolen != 0) {
230 error = getsockaddr(&to, uap->to, uap->tolen);
231 if (error != 0) {
232 to = NULL;
233 goto sctp_bad2;
234 }
235 cap_rights_set_one(&rights, CAP_CONNECT);
236 }
237
238 AUDIT_ARG_FD(uap->sd);
239 error = getsock(td, uap->sd, &rights, &fp);
240 if (error != 0)
241 goto sctp_bad;
242 #ifdef KTRACE
243 if (to && (KTRPOINT(td, KTR_STRUCT)))
244 ktrsockaddr(to);
245 #endif
246
247 iov[0].iov_base = uap->msg;
248 iov[0].iov_len = uap->mlen;
249
250 so = (struct socket *)fp->f_data;
251 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
252 error = EOPNOTSUPP;
253 goto sctp_bad;
254 }
255 #ifdef MAC
256 error = mac_socket_check_send(td->td_ucred, so);
257 if (error != 0)
258 goto sctp_bad;
259 #endif /* MAC */
260
261 auio.uio_iov = iov;
262 auio.uio_iovcnt = 1;
263 auio.uio_segflg = UIO_USERSPACE;
264 auio.uio_rw = UIO_WRITE;
265 auio.uio_td = td;
266 auio.uio_offset = 0; /* XXX */
267 auio.uio_resid = 0;
268 #ifdef KTRACE
269 if (KTRPOINT(td, KTR_GENIO))
270 ktruio = cloneuio(&auio);
271 #endif /* KTRACE */
272 len = auio.uio_resid = uap->mlen;
273 CURVNET_SET(so->so_vnet);
274 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
275 (struct mbuf *)NULL, uap->flags, u_sinfo, td);
276 CURVNET_RESTORE();
277 if (error != 0) {
278 if (auio.uio_resid != len && (error == ERESTART ||
279 error == EINTR || error == EWOULDBLOCK))
280 error = 0;
281 /* Generation of SIGPIPE can be controlled per socket. */
282 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
283 !(uap->flags & MSG_NOSIGNAL)) {
284 PROC_LOCK(td->td_proc);
285 tdsignal(td, SIGPIPE);
286 PROC_UNLOCK(td->td_proc);
287 }
288 }
289 if (error == 0)
290 td->td_retval[0] = len - auio.uio_resid;
291 #ifdef KTRACE
292 if (ktruio != NULL) {
293 if (error == 0)
294 ktruio->uio_resid = td->td_retval[0];
295 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
296 }
297 #endif /* KTRACE */
298 sctp_bad:
299 if (fp != NULL)
300 fdrop(fp, td);
301 sctp_bad2:
302 free(to, M_SONAME);
303 return (error);
304 }
305
306 int
sys_sctp_generic_sendmsg_iov(struct thread * td,struct sctp_generic_sendmsg_iov_args * uap)307 sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap)
308 {
309 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
310 struct socket *so;
311 struct file *fp = NULL;
312 struct sockaddr *to = NULL;
313 #ifdef KTRACE
314 struct uio *ktruio = NULL;
315 #endif
316 struct uio auio;
317 struct iovec *iov, *tiov;
318 cap_rights_t rights;
319 ssize_t len;
320 int error, i;
321
322 if (uap->sinfo != NULL) {
323 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
324 if (error != 0)
325 return (error);
326 u_sinfo = &sinfo;
327 }
328 cap_rights_init_one(&rights, CAP_SEND);
329 if (uap->tolen != 0) {
330 error = getsockaddr(&to, uap->to, uap->tolen);
331 if (error != 0) {
332 to = NULL;
333 goto sctp_bad2;
334 }
335 cap_rights_set_one(&rights, CAP_CONNECT);
336 }
337
338 AUDIT_ARG_FD(uap->sd);
339 error = getsock(td, uap->sd, &rights, &fp);
340 if (error != 0)
341 goto sctp_bad1;
342
343 #ifdef COMPAT_FREEBSD32
344 if (SV_CURPROC_FLAG(SV_ILP32))
345 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
346 uap->iovlen, &iov, EMSGSIZE);
347 else
348 #endif
349 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
350 if (error != 0)
351 goto sctp_bad1;
352 #ifdef KTRACE
353 if (to && (KTRPOINT(td, KTR_STRUCT)))
354 ktrsockaddr(to);
355 #endif
356
357 so = (struct socket *)fp->f_data;
358 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
359 error = EOPNOTSUPP;
360 goto sctp_bad;
361 }
362 #ifdef MAC
363 error = mac_socket_check_send(td->td_ucred, so);
364 if (error != 0)
365 goto sctp_bad;
366 #endif /* MAC */
367
368 auio.uio_iov = iov;
369 auio.uio_iovcnt = uap->iovlen;
370 auio.uio_segflg = UIO_USERSPACE;
371 auio.uio_rw = UIO_WRITE;
372 auio.uio_td = td;
373 auio.uio_offset = 0; /* XXX */
374 auio.uio_resid = 0;
375 tiov = iov;
376 for (i = 0; i <uap->iovlen; i++, tiov++) {
377 if ((auio.uio_resid += tiov->iov_len) < 0) {
378 error = EINVAL;
379 goto sctp_bad;
380 }
381 }
382 #ifdef KTRACE
383 if (KTRPOINT(td, KTR_GENIO))
384 ktruio = cloneuio(&auio);
385 #endif /* KTRACE */
386 len = auio.uio_resid;
387 CURVNET_SET(so->so_vnet);
388 error = sctp_lower_sosend(so, to, &auio,
389 (struct mbuf *)NULL, (struct mbuf *)NULL,
390 uap->flags, u_sinfo, td);
391 CURVNET_RESTORE();
392 if (error != 0) {
393 if (auio.uio_resid != len && (error == ERESTART ||
394 error == EINTR || error == EWOULDBLOCK))
395 error = 0;
396 /* Generation of SIGPIPE can be controlled per socket */
397 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
398 !(uap->flags & MSG_NOSIGNAL)) {
399 PROC_LOCK(td->td_proc);
400 tdsignal(td, SIGPIPE);
401 PROC_UNLOCK(td->td_proc);
402 }
403 }
404 if (error == 0)
405 td->td_retval[0] = len - auio.uio_resid;
406 #ifdef KTRACE
407 if (ktruio != NULL) {
408 if (error == 0)
409 ktruio->uio_resid = td->td_retval[0];
410 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
411 }
412 #endif /* KTRACE */
413 sctp_bad:
414 free(iov, M_IOV);
415 sctp_bad1:
416 if (fp != NULL)
417 fdrop(fp, td);
418 sctp_bad2:
419 free(to, M_SONAME);
420 return (error);
421 }
422
423 int
sys_sctp_generic_recvmsg(struct thread * td,struct sctp_generic_recvmsg_args * uap)424 sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap)
425 {
426 uint8_t sockbufstore[256];
427 struct uio auio;
428 struct iovec *iov, *tiov;
429 struct sctp_sndrcvinfo sinfo;
430 struct socket *so;
431 struct file *fp = NULL;
432 struct sockaddr *fromsa;
433 cap_rights_t rights;
434 #ifdef KTRACE
435 struct uio *ktruio = NULL;
436 #endif
437 ssize_t len;
438 int error, fromlen, i, msg_flags;
439
440 AUDIT_ARG_FD(uap->sd);
441 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
442 &fp);
443 if (error != 0)
444 return (error);
445 #ifdef COMPAT_FREEBSD32
446 if (SV_CURPROC_FLAG(SV_ILP32))
447 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
448 uap->iovlen, &iov, EMSGSIZE);
449 else
450 #endif
451 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
452 if (error != 0)
453 goto out1;
454
455 so = fp->f_data;
456 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
457 error = EOPNOTSUPP;
458 goto out;
459 }
460 #ifdef MAC
461 error = mac_socket_check_receive(td->td_ucred, so);
462 if (error != 0)
463 goto out;
464 #endif /* MAC */
465
466 if (uap->fromlenaddr != NULL) {
467 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
468 if (error != 0)
469 goto out;
470 } else {
471 fromlen = 0;
472 }
473 if (uap->msg_flags) {
474 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
475 if (error != 0)
476 goto out;
477 } else {
478 msg_flags = 0;
479 }
480 auio.uio_iov = iov;
481 auio.uio_iovcnt = uap->iovlen;
482 auio.uio_segflg = UIO_USERSPACE;
483 auio.uio_rw = UIO_READ;
484 auio.uio_td = td;
485 auio.uio_offset = 0; /* XXX */
486 auio.uio_resid = 0;
487 tiov = iov;
488 for (i = 0; i <uap->iovlen; i++, tiov++) {
489 if ((auio.uio_resid += tiov->iov_len) < 0) {
490 error = EINVAL;
491 goto out;
492 }
493 }
494 len = auio.uio_resid;
495 fromsa = (struct sockaddr *)sockbufstore;
496
497 #ifdef KTRACE
498 if (KTRPOINT(td, KTR_GENIO))
499 ktruio = cloneuio(&auio);
500 #endif /* KTRACE */
501 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
502 CURVNET_SET(so->so_vnet);
503 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
504 fromsa, fromlen, &msg_flags,
505 (struct sctp_sndrcvinfo *)&sinfo, 1);
506 CURVNET_RESTORE();
507 if (error != 0) {
508 if (auio.uio_resid != len && (error == ERESTART ||
509 error == EINTR || error == EWOULDBLOCK))
510 error = 0;
511 } else {
512 if (uap->sinfo)
513 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
514 }
515 #ifdef KTRACE
516 if (ktruio != NULL) {
517 ktruio->uio_resid = len - auio.uio_resid;
518 ktrgenio(uap->sd, UIO_READ, ktruio, error);
519 }
520 #endif /* KTRACE */
521 if (error != 0)
522 goto out;
523 td->td_retval[0] = len - auio.uio_resid;
524
525 if (fromlen && uap->from) {
526 len = fromlen;
527 if (len <= 0 || fromsa == NULL)
528 len = 0;
529 else {
530 len = MIN(len, fromsa->sa_len);
531 error = copyout(fromsa, uap->from, (size_t)len);
532 if (error != 0)
533 goto out;
534 }
535 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
536 if (error != 0)
537 goto out;
538 }
539 #ifdef KTRACE
540 if (KTRPOINT(td, KTR_STRUCT))
541 ktrsockaddr(fromsa);
542 #endif
543 if (uap->msg_flags) {
544 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
545 if (error != 0)
546 goto out;
547 }
548 out:
549 free(iov, M_IOV);
550 out1:
551 if (fp != NULL)
552 fdrop(fp, td);
553
554 return (error);
555 }
556