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 __FBSDID("$FreeBSD$");
33
34 #include "opt_capsicum.h"
35 #include "opt_sctp.h"
36 #include "opt_ktrace.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/capsicum.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44 #include <sys/sysproto.h>
45 #include <sys/malloc.h>
46 #include <sys/filedesc.h>
47 #include <sys/event.h>
48 #include <sys/proc.h>
49 #include <sys/fcntl.h>
50 #include <sys/file.h>
51 #include <sys/filio.h>
52 #include <sys/jail.h>
53 #include <sys/mount.h>
54 #include <sys/mbuf.h>
55 #include <sys/protosw.h>
56 #include <sys/sf_buf.h>
57 #include <sys/sysent.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
60 #include <sys/signalvar.h>
61 #include <sys/syscall.h>
62 #include <sys/syscallsubr.h>
63 #include <sys/sysctl.h>
64 #include <sys/uio.h>
65 #include <sys/vnode.h>
66 #ifdef KTRACE
67 #include <sys/ktrace.h>
68 #endif
69 #ifdef COMPAT_FREEBSD32
70 #include <compat/freebsd32/freebsd32.h>
71 #include <compat/freebsd32/freebsd32_syscall.h>
72 #include <compat/freebsd32/freebsd32_util.h>
73 #endif
74
75 #include <net/vnet.h>
76
77 #include <security/audit/audit.h>
78 #include <security/mac/mac_framework.h>
79
80 #include <netinet/sctp.h>
81 #include <netinet/sctp_os_bsd.h>
82 #include <netinet/sctp_peeloff.h>
83
84 static struct syscall_helper_data sctp_syscalls[] = {
85 SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED),
86 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED),
87 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED),
88 SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED),
89 SYSCALL_INIT_LAST
90 };
91
92 #ifdef COMPAT_FREEBSD32
93 static struct syscall_helper_data sctp32_syscalls[] = {
94 SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff),
95 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg),
96 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov),
97 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg),
98 SYSCALL_INIT_LAST
99 };
100 #endif
101
102 int
103 sctp_syscalls_init(void)
104 {
105 int error;
106
107 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD);
108 if (error != 0)
109 return (error);
110 #ifdef COMPAT_FREEBSD32
111 error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD);
112 if (error != 0)
113 return (error);
114 #endif
115 return (0);
116 }
117
118 #ifdef SCTP
119 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
120 #endif
121
122 int
123 sctp_syscalls_uninit(void)
124 {
125 int error;
126
127 #ifdef COMPAT_FREEBSD32
128 error = syscall32_helper_unregister(sctp32_syscalls);
129 if (error != 0)
130 return (error);
131 #endif
132 error = syscall_helper_unregister(sctp_syscalls);
133 if (error != 0)
134 return (error);
135 return (0);
136 }
137
138 /*
139 * SCTP syscalls.
140 */
141 int
142 sys_sctp_peeloff(td, uap)
143 struct thread *td;
144 struct sctp_peeloff_args /* {
145 int sd;
146 caddr_t name;
147 } */ *uap;
148 {
149 struct file *headfp, *nfp = NULL;
150 struct socket *head, *so;
151 cap_rights_t rights;
152 u_int fflag;
153 int error, fd;
154
155 AUDIT_ARG_FD(uap->sd);
156 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF),
157 &headfp);
158 if (error != 0)
159 goto done2;
160 fflag = atomic_load_int(&headfp->f_flag);
161 head = headfp->f_data;
162 if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
163 error = EOPNOTSUPP;
164 goto done;
165 }
166 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
167 if (error != 0)
168 goto done;
169 /*
170 * At this point we know we do have a assoc to pull
171 * we proceed to get the fd setup. This may block
172 * but that is ok.
173 */
174
175 error = falloc(td, &nfp, &fd, 0);
176 if (error != 0)
177 goto done;
178 td->td_retval[0] = fd;
179
180 CURVNET_SET(head->so_vnet);
181 so = sopeeloff(head);
182 if (so == NULL) {
183 error = ENOMEM;
184 goto noconnection;
185 }
186 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
187 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
188 if (error != 0)
189 goto noconnection;
190 if (head->so_sigio != NULL)
191 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
192
193 noconnection:
194 /*
195 * close the new descriptor, assuming someone hasn't ripped it
196 * out from under us.
197 */
198 if (error != 0)
199 fdclose(td, nfp, fd);
200
201 /*
202 * Release explicitly held references before returning.
203 */
204 CURVNET_RESTORE();
205 done:
206 if (nfp != NULL)
207 fdrop(nfp, td);
208 fdrop(headfp, td);
209 done2:
210 return (error);
211 }
212
213 int
214 sys_sctp_generic_sendmsg (td, uap)
215 struct thread *td;
216 struct sctp_generic_sendmsg_args /* {
217 int sd,
218 caddr_t msg,
219 int mlen,
220 caddr_t to,
221 __socklen_t tolen,
222 struct sctp_sndrcvinfo *sinfo,
223 int flags
224 } */ *uap;
225 {
226 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
227 struct socket *so;
228 struct file *fp = NULL;
229 struct sockaddr *to = NULL;
230 #ifdef KTRACE
231 struct uio *ktruio = NULL;
232 #endif
233 struct uio auio;
234 struct iovec iov[1];
235 cap_rights_t rights;
236 int error = 0, len;
237
238 if (uap->sinfo != NULL) {
239 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
240 if (error != 0)
241 return (error);
242 u_sinfo = &sinfo;
243 }
244
245 cap_rights_init_one(&rights, CAP_SEND);
246 if (uap->tolen != 0) {
247 error = getsockaddr(&to, uap->to, uap->tolen);
248 if (error != 0) {
249 to = NULL;
250 goto sctp_bad2;
251 }
252 cap_rights_set_one(&rights, CAP_CONNECT);
253 }
254
255 AUDIT_ARG_FD(uap->sd);
256 error = getsock(td, uap->sd, &rights, &fp);
257 if (error != 0)
258 goto sctp_bad;
259 #ifdef KTRACE
260 if (to && (KTRPOINT(td, KTR_STRUCT)))
261 ktrsockaddr(to);
262 #endif
263
264 iov[0].iov_base = uap->msg;
265 iov[0].iov_len = uap->mlen;
266
267 so = (struct socket *)fp->f_data;
268 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
269 error = EOPNOTSUPP;
270 goto sctp_bad;
271 }
272 #ifdef MAC
273 error = mac_socket_check_send(td->td_ucred, so);
274 if (error != 0)
275 goto sctp_bad;
276 #endif /* MAC */
277
278 auio.uio_iov = iov;
279 auio.uio_iovcnt = 1;
280 auio.uio_segflg = UIO_USERSPACE;
281 auio.uio_rw = UIO_WRITE;
282 auio.uio_td = td;
283 auio.uio_offset = 0; /* XXX */
284 auio.uio_resid = 0;
285 #ifdef KTRACE
286 if (KTRPOINT(td, KTR_GENIO))
287 ktruio = cloneuio(&auio);
288 #endif /* KTRACE */
289 len = auio.uio_resid = uap->mlen;
290 CURVNET_SET(so->so_vnet);
291 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
292 (struct mbuf *)NULL, uap->flags, u_sinfo, td);
293 CURVNET_RESTORE();
294 if (error != 0) {
295 if (auio.uio_resid != len && (error == ERESTART ||
296 error == EINTR || error == EWOULDBLOCK))
297 error = 0;
298 /* Generation of SIGPIPE can be controlled per socket. */
299 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
300 !(uap->flags & MSG_NOSIGNAL)) {
301 PROC_LOCK(td->td_proc);
302 tdsignal(td, SIGPIPE);
303 PROC_UNLOCK(td->td_proc);
304 }
305 }
306 if (error == 0)
307 td->td_retval[0] = len - auio.uio_resid;
308 #ifdef KTRACE
309 if (ktruio != NULL) {
310 ktruio->uio_resid = td->td_retval[0];
311 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
312 }
313 #endif /* KTRACE */
314 sctp_bad:
315 if (fp != NULL)
316 fdrop(fp, td);
317 sctp_bad2:
318 free(to, M_SONAME);
319 return (error);
320 }
321
322 int
323 sys_sctp_generic_sendmsg_iov(td, uap)
324 struct thread *td;
325 struct sctp_generic_sendmsg_iov_args /* {
326 int sd,
327 struct iovec *iov,
328 int iovlen,
329 caddr_t to,
330 __socklen_t tolen,
331 struct sctp_sndrcvinfo *sinfo,
332 int flags
333 } */ *uap;
334 {
335 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
336 struct socket *so;
337 struct file *fp = NULL;
338 struct sockaddr *to = NULL;
339 #ifdef KTRACE
340 struct uio *ktruio = NULL;
341 #endif
342 struct uio auio;
343 struct iovec *iov, *tiov;
344 cap_rights_t rights;
345 ssize_t len;
346 int error, i;
347
348 if (uap->sinfo != NULL) {
349 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
350 if (error != 0)
351 return (error);
352 u_sinfo = &sinfo;
353 }
354 cap_rights_init_one(&rights, CAP_SEND);
355 if (uap->tolen != 0) {
356 error = getsockaddr(&to, uap->to, uap->tolen);
357 if (error != 0) {
358 to = NULL;
359 goto sctp_bad2;
360 }
361 cap_rights_set_one(&rights, CAP_CONNECT);
362 }
363
364 AUDIT_ARG_FD(uap->sd);
365 error = getsock(td, uap->sd, &rights, &fp);
366 if (error != 0)
367 goto sctp_bad1;
368
369 #ifdef COMPAT_FREEBSD32
370 if (SV_CURPROC_FLAG(SV_ILP32))
371 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
372 uap->iovlen, &iov, EMSGSIZE);
373 else
374 #endif
375 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
376 if (error != 0)
377 goto sctp_bad1;
378 #ifdef KTRACE
379 if (to && (KTRPOINT(td, KTR_STRUCT)))
380 ktrsockaddr(to);
381 #endif
382
383 so = (struct socket *)fp->f_data;
384 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
385 error = EOPNOTSUPP;
386 goto sctp_bad;
387 }
388 #ifdef MAC
389 error = mac_socket_check_send(td->td_ucred, so);
390 if (error != 0)
391 goto sctp_bad;
392 #endif /* MAC */
393
394 auio.uio_iov = iov;
395 auio.uio_iovcnt = uap->iovlen;
396 auio.uio_segflg = UIO_USERSPACE;
397 auio.uio_rw = UIO_WRITE;
398 auio.uio_td = td;
399 auio.uio_offset = 0; /* XXX */
400 auio.uio_resid = 0;
401 tiov = iov;
402 for (i = 0; i <uap->iovlen; i++, tiov++) {
403 if ((auio.uio_resid += tiov->iov_len) < 0) {
404 error = EINVAL;
405 goto sctp_bad;
406 }
407 }
408 #ifdef KTRACE
409 if (KTRPOINT(td, KTR_GENIO))
410 ktruio = cloneuio(&auio);
411 #endif /* KTRACE */
412 len = auio.uio_resid;
413 CURVNET_SET(so->so_vnet);
414 error = sctp_lower_sosend(so, to, &auio,
415 (struct mbuf *)NULL, (struct mbuf *)NULL,
416 uap->flags, u_sinfo, td);
417 CURVNET_RESTORE();
418 if (error != 0) {
419 if (auio.uio_resid != len && (error == ERESTART ||
420 error == EINTR || error == EWOULDBLOCK))
421 error = 0;
422 /* Generation of SIGPIPE can be controlled per socket */
423 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
424 !(uap->flags & MSG_NOSIGNAL)) {
425 PROC_LOCK(td->td_proc);
426 tdsignal(td, SIGPIPE);
427 PROC_UNLOCK(td->td_proc);
428 }
429 }
430 if (error == 0)
431 td->td_retval[0] = len - auio.uio_resid;
432 #ifdef KTRACE
433 if (ktruio != NULL) {
434 ktruio->uio_resid = td->td_retval[0];
435 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
436 }
437 #endif /* KTRACE */
438 sctp_bad:
439 free(iov, M_IOV);
440 sctp_bad1:
441 if (fp != NULL)
442 fdrop(fp, td);
443 sctp_bad2:
444 free(to, M_SONAME);
445 return (error);
446 }
447
448 int
449 sys_sctp_generic_recvmsg(td, uap)
450 struct thread *td;
451 struct sctp_generic_recvmsg_args /* {
452 int sd,
453 struct iovec *iov,
454 int iovlen,
455 struct sockaddr *from,
456 __socklen_t *fromlenaddr,
457 struct sctp_sndrcvinfo *sinfo,
458 int *msg_flags
459 } */ *uap;
460 {
461 uint8_t sockbufstore[256];
462 struct uio auio;
463 struct iovec *iov, *tiov;
464 struct sctp_sndrcvinfo sinfo;
465 struct socket *so;
466 struct file *fp = NULL;
467 struct sockaddr *fromsa;
468 cap_rights_t rights;
469 #ifdef KTRACE
470 struct uio *ktruio = NULL;
471 #endif
472 ssize_t len;
473 int error, fromlen, i, msg_flags;
474
475 AUDIT_ARG_FD(uap->sd);
476 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
477 &fp);
478 if (error != 0)
479 return (error);
480 #ifdef COMPAT_FREEBSD32
481 if (SV_CURPROC_FLAG(SV_ILP32))
482 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
483 uap->iovlen, &iov, EMSGSIZE);
484 else
485 #endif
486 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
487 if (error != 0)
488 goto out1;
489
490 so = fp->f_data;
491 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
492 error = EOPNOTSUPP;
493 goto out;
494 }
495 #ifdef MAC
496 error = mac_socket_check_receive(td->td_ucred, so);
497 if (error != 0)
498 goto out;
499 #endif /* MAC */
500
501 if (uap->fromlenaddr != NULL) {
502 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
503 if (error != 0)
504 goto out;
505 } else {
506 fromlen = 0;
507 }
508 if (uap->msg_flags) {
509 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
510 if (error != 0)
511 goto out;
512 } else {
513 msg_flags = 0;
514 }
515 auio.uio_iov = iov;
516 auio.uio_iovcnt = uap->iovlen;
517 auio.uio_segflg = UIO_USERSPACE;
518 auio.uio_rw = UIO_READ;
519 auio.uio_td = td;
520 auio.uio_offset = 0; /* XXX */
521 auio.uio_resid = 0;
522 tiov = iov;
523 for (i = 0; i <uap->iovlen; i++, tiov++) {
524 if ((auio.uio_resid += tiov->iov_len) < 0) {
525 error = EINVAL;
526 goto out;
527 }
528 }
529 len = auio.uio_resid;
530 fromsa = (struct sockaddr *)sockbufstore;
531
532 #ifdef KTRACE
533 if (KTRPOINT(td, KTR_GENIO))
534 ktruio = cloneuio(&auio);
535 #endif /* KTRACE */
536 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
537 CURVNET_SET(so->so_vnet);
538 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
539 fromsa, fromlen, &msg_flags,
540 (struct sctp_sndrcvinfo *)&sinfo, 1);
541 CURVNET_RESTORE();
542 if (error != 0) {
543 if (auio.uio_resid != len && (error == ERESTART ||
544 error == EINTR || error == EWOULDBLOCK))
545 error = 0;
546 } else {
547 if (uap->sinfo)
548 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
549 }
550 #ifdef KTRACE
551 if (ktruio != NULL) {
552 ktruio->uio_resid = len - auio.uio_resid;
553 ktrgenio(uap->sd, UIO_READ, ktruio, error);
554 }
555 #endif /* KTRACE */
556 if (error != 0)
557 goto out;
558 td->td_retval[0] = len - auio.uio_resid;
559
560 if (fromlen && uap->from) {
561 len = fromlen;
562 if (len <= 0 || fromsa == NULL)
563 len = 0;
564 else {
565 len = MIN(len, fromsa->sa_len);
566 error = copyout(fromsa, uap->from, (size_t)len);
567 if (error != 0)
568 goto out;
569 }
570 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
571 if (error != 0)
572 goto out;
573 }
574 #ifdef KTRACE
575 if (KTRPOINT(td, KTR_STRUCT))
576 ktrsockaddr(fromsa);
577 #endif
578 if (uap->msg_flags) {
579 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
580 if (error != 0)
581 goto out;
582 }
583 out:
584 free(iov, M_IOV);
585 out1:
586 if (fp != NULL)
587 fdrop(fp, td);
588
589 return (error);
590 }
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