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 * 4. 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: releng/11.0/sys/netinet/sctp_syscalls.c 298066 2016-04-15 15:46:41Z pfg $");
33
34 #include "opt_capsicum.h"
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37 #include "opt_sctp.h"
38 #include "opt_compat.h"
39 #include "opt_ktrace.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/capsicum.h>
44 #include <sys/kernel.h>
45 #include <sys/lock.h>
46 #include <sys/mutex.h>
47 #include <sys/sysproto.h>
48 #include <sys/malloc.h>
49 #include <sys/filedesc.h>
50 #include <sys/event.h>
51 #include <sys/proc.h>
52 #include <sys/fcntl.h>
53 #include <sys/file.h>
54 #include <sys/filio.h>
55 #include <sys/jail.h>
56 #include <sys/mount.h>
57 #include <sys/mbuf.h>
58 #include <sys/protosw.h>
59 #include <sys/sf_buf.h>
60 #include <sys/sysent.h>
61 #include <sys/socket.h>
62 #include <sys/socketvar.h>
63 #include <sys/signalvar.h>
64 #include <sys/syscall.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysctl.h>
67 #include <sys/uio.h>
68 #include <sys/vnode.h>
69 #ifdef KTRACE
70 #include <sys/ktrace.h>
71 #endif
72 #ifdef COMPAT_FREEBSD32
73 #include <compat/freebsd32/freebsd32_util.h>
74 #endif
75
76 #include <net/vnet.h>
77
78 #include <security/audit/audit.h>
79 #include <security/mac/mac_framework.h>
80
81 #include <netinet/sctp.h>
82 #include <netinet/sctp_peeloff.h>
83
84 static struct syscall_helper_data sctp_syscalls[] = {
85 SYSCALL_INIT_HELPER(sctp_peeloff),
86 SYSCALL_INIT_HELPER(sctp_generic_sendmsg),
87 SYSCALL_INIT_HELPER(sctp_generic_sendmsg_iov),
88 SYSCALL_INIT_HELPER(sctp_generic_recvmsg),
89 SYSCALL_INIT_LAST
90 };
91
92 static void
93 sctp_syscalls_init(void *unused __unused)
94 {
95 int error;
96
97 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC);
98 KASSERT((error == 0),
99 ("%s: syscall_helper_register failed for sctp syscalls", __func__));
100 #ifdef COMPAT_FREEBSD32
101 error = syscall32_helper_register(sctp_syscalls, SY_THR_STATIC);
102 KASSERT((error == 0),
103 ("%s: syscall32_helper_register failed for sctp syscalls",
104 __func__));
105 #endif
106 }
107 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
108
109 /*
110 * SCTP syscalls.
111 * Functionality only compiled in if SCTP is defined in the kernel Makefile,
112 * otherwise all return EOPNOTSUPP.
113 * XXX: We should make this loadable one day.
114 */
115 int
116 sys_sctp_peeloff(td, uap)
117 struct thread *td;
118 struct sctp_peeloff_args /* {
119 int sd;
120 caddr_t name;
121 } */ *uap;
122 {
123 #if (defined(INET) || defined(INET6)) && defined(SCTP)
124 struct file *nfp = NULL;
125 struct socket *head, *so;
126 cap_rights_t rights;
127 u_int fflag;
128 int error, fd;
129
130 AUDIT_ARG_FD(uap->sd);
131 error = fgetsock(td, uap->sd, cap_rights_init(&rights, CAP_PEELOFF),
132 &head, &fflag);
133 if (error != 0)
134 goto done2;
135 if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
136 error = EOPNOTSUPP;
137 goto done;
138 }
139 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
140 if (error != 0)
141 goto done;
142 /*
143 * At this point we know we do have a assoc to pull
144 * we proceed to get the fd setup. This may block
145 * but that is ok.
146 */
147
148 error = falloc(td, &nfp, &fd, 0);
149 if (error != 0)
150 goto done;
151 td->td_retval[0] = fd;
152
153 CURVNET_SET(head->so_vnet);
154 so = sonewconn(head, SS_ISCONNECTED);
155 if (so == NULL) {
156 error = ENOMEM;
157 goto noconnection;
158 }
159 /*
160 * Before changing the flags on the socket, we have to bump the
161 * reference count. Otherwise, if the protocol calls sofree(),
162 * the socket will be released due to a zero refcount.
163 */
164 SOCK_LOCK(so);
165 soref(so); /* file descriptor reference */
166 SOCK_UNLOCK(so);
167
168 ACCEPT_LOCK();
169
170 TAILQ_REMOVE(&head->so_comp, so, so_list);
171 head->so_qlen--;
172 so->so_state |= (head->so_state & SS_NBIO);
173 so->so_state &= ~SS_NOFDREF;
174 so->so_qstate &= ~SQ_COMP;
175 so->so_head = NULL;
176 ACCEPT_UNLOCK();
177 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
178 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
179 if (error != 0)
180 goto noconnection;
181 if (head->so_sigio != NULL)
182 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
183
184 noconnection:
185 /*
186 * close the new descriptor, assuming someone hasn't ripped it
187 * out from under us.
188 */
189 if (error != 0)
190 fdclose(td, nfp, fd);
191
192 /*
193 * Release explicitly held references before returning.
194 */
195 CURVNET_RESTORE();
196 done:
197 if (nfp != NULL)
198 fdrop(nfp, td);
199 fputsock(head);
200 done2:
201 return (error);
202 #else /* SCTP */
203 return (EOPNOTSUPP);
204 #endif /* SCTP */
205 }
206
207 int
208 sys_sctp_generic_sendmsg (td, uap)
209 struct thread *td;
210 struct sctp_generic_sendmsg_args /* {
211 int sd,
212 caddr_t msg,
213 int mlen,
214 caddr_t to,
215 __socklen_t tolen,
216 struct sctp_sndrcvinfo *sinfo,
217 int flags
218 } */ *uap;
219 {
220 #if (defined(INET) || defined(INET6)) && defined(SCTP)
221 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
222 struct socket *so;
223 struct file *fp = NULL;
224 struct sockaddr *to = NULL;
225 #ifdef KTRACE
226 struct uio *ktruio = NULL;
227 #endif
228 struct uio auio;
229 struct iovec iov[1];
230 cap_rights_t rights;
231 int error = 0, len;
232
233 if (uap->sinfo != NULL) {
234 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
235 if (error != 0)
236 return (error);
237 u_sinfo = &sinfo;
238 }
239
240 cap_rights_init(&rights, CAP_SEND);
241 if (uap->tolen != 0) {
242 error = getsockaddr(&to, uap->to, uap->tolen);
243 if (error != 0) {
244 to = NULL;
245 goto sctp_bad2;
246 }
247 cap_rights_set(&rights, CAP_CONNECT);
248 }
249
250 AUDIT_ARG_FD(uap->sd);
251 error = getsock_cap(td, uap->sd, &rights, &fp, NULL);
252 if (error != 0)
253 goto sctp_bad;
254 #ifdef KTRACE
255 if (to && (KTRPOINT(td, KTR_STRUCT)))
256 ktrsockaddr(to);
257 #endif
258
259 iov[0].iov_base = uap->msg;
260 iov[0].iov_len = uap->mlen;
261
262 so = (struct socket *)fp->f_data;
263 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
264 error = EOPNOTSUPP;
265 goto sctp_bad;
266 }
267 #ifdef MAC
268 error = mac_socket_check_send(td->td_ucred, so);
269 if (error != 0)
270 goto sctp_bad;
271 #endif /* MAC */
272
273 auio.uio_iov = iov;
274 auio.uio_iovcnt = 1;
275 auio.uio_segflg = UIO_USERSPACE;
276 auio.uio_rw = UIO_WRITE;
277 auio.uio_td = td;
278 auio.uio_offset = 0; /* XXX */
279 auio.uio_resid = 0;
280 #ifdef KTRACE
281 if (KTRPOINT(td, KTR_GENIO))
282 ktruio = cloneuio(&auio);
283 #endif /* KTRACE */
284 len = auio.uio_resid = uap->mlen;
285 CURVNET_SET(so->so_vnet);
286 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
287 (struct mbuf *)NULL, uap->flags, u_sinfo, td);
288 CURVNET_RESTORE();
289 if (error != 0) {
290 if (auio.uio_resid != len && (error == ERESTART ||
291 error == EINTR || error == EWOULDBLOCK))
292 error = 0;
293 /* Generation of SIGPIPE can be controlled per socket. */
294 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
295 !(uap->flags & MSG_NOSIGNAL)) {
296 PROC_LOCK(td->td_proc);
297 tdsignal(td, SIGPIPE);
298 PROC_UNLOCK(td->td_proc);
299 }
300 }
301 if (error == 0)
302 td->td_retval[0] = len - auio.uio_resid;
303 #ifdef KTRACE
304 if (ktruio != NULL) {
305 ktruio->uio_resid = td->td_retval[0];
306 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
307 }
308 #endif /* KTRACE */
309 sctp_bad:
310 if (fp != NULL)
311 fdrop(fp, td);
312 sctp_bad2:
313 free(to, M_SONAME);
314 return (error);
315 #else /* SCTP */
316 return (EOPNOTSUPP);
317 #endif /* SCTP */
318 }
319
320 int
321 sys_sctp_generic_sendmsg_iov(td, uap)
322 struct thread *td;
323 struct sctp_generic_sendmsg_iov_args /* {
324 int sd,
325 struct iovec *iov,
326 int iovlen,
327 caddr_t to,
328 __socklen_t tolen,
329 struct sctp_sndrcvinfo *sinfo,
330 int flags
331 } */ *uap;
332 {
333 #if (defined(INET) || defined(INET6)) && defined(SCTP)
334 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
335 struct socket *so;
336 struct file *fp = NULL;
337 struct sockaddr *to = NULL;
338 #ifdef KTRACE
339 struct uio *ktruio = NULL;
340 #endif
341 struct uio auio;
342 struct iovec *iov, *tiov;
343 cap_rights_t rights;
344 ssize_t len;
345 int error, i;
346
347 if (uap->sinfo != NULL) {
348 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
349 if (error != 0)
350 return (error);
351 u_sinfo = &sinfo;
352 }
353 cap_rights_init(&rights, CAP_SEND);
354 if (uap->tolen != 0) {
355 error = getsockaddr(&to, uap->to, uap->tolen);
356 if (error != 0) {
357 to = NULL;
358 goto sctp_bad2;
359 }
360 cap_rights_set(&rights, CAP_CONNECT);
361 }
362
363 AUDIT_ARG_FD(uap->sd);
364 error = getsock_cap(td, uap->sd, &rights, &fp, NULL);
365 if (error != 0)
366 goto sctp_bad1;
367
368 #ifdef COMPAT_FREEBSD32
369 if (SV_CURPROC_FLAG(SV_ILP32))
370 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
371 uap->iovlen, &iov, EMSGSIZE);
372 else
373 #endif
374 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
375 if (error != 0)
376 goto sctp_bad1;
377 #ifdef KTRACE
378 if (to && (KTRPOINT(td, KTR_STRUCT)))
379 ktrsockaddr(to);
380 #endif
381
382 so = (struct socket *)fp->f_data;
383 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
384 error = EOPNOTSUPP;
385 goto sctp_bad;
386 }
387 #ifdef MAC
388 error = mac_socket_check_send(td->td_ucred, so);
389 if (error != 0)
390 goto sctp_bad;
391 #endif /* MAC */
392
393 auio.uio_iov = iov;
394 auio.uio_iovcnt = uap->iovlen;
395 auio.uio_segflg = UIO_USERSPACE;
396 auio.uio_rw = UIO_WRITE;
397 auio.uio_td = td;
398 auio.uio_offset = 0; /* XXX */
399 auio.uio_resid = 0;
400 tiov = iov;
401 for (i = 0; i <uap->iovlen; i++, tiov++) {
402 if ((auio.uio_resid += tiov->iov_len) < 0) {
403 error = EINVAL;
404 goto sctp_bad;
405 }
406 }
407 #ifdef KTRACE
408 if (KTRPOINT(td, KTR_GENIO))
409 ktruio = cloneuio(&auio);
410 #endif /* KTRACE */
411 len = auio.uio_resid;
412 CURVNET_SET(so->so_vnet);
413 error = sctp_lower_sosend(so, to, &auio,
414 (struct mbuf *)NULL, (struct mbuf *)NULL,
415 uap->flags, u_sinfo, td);
416 CURVNET_RESTORE();
417 if (error != 0) {
418 if (auio.uio_resid != len && (error == ERESTART ||
419 error == EINTR || error == EWOULDBLOCK))
420 error = 0;
421 /* Generation of SIGPIPE can be controlled per socket */
422 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
423 !(uap->flags & MSG_NOSIGNAL)) {
424 PROC_LOCK(td->td_proc);
425 tdsignal(td, SIGPIPE);
426 PROC_UNLOCK(td->td_proc);
427 }
428 }
429 if (error == 0)
430 td->td_retval[0] = len - auio.uio_resid;
431 #ifdef KTRACE
432 if (ktruio != NULL) {
433 ktruio->uio_resid = td->td_retval[0];
434 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
435 }
436 #endif /* KTRACE */
437 sctp_bad:
438 free(iov, M_IOV);
439 sctp_bad1:
440 if (fp != NULL)
441 fdrop(fp, td);
442 sctp_bad2:
443 free(to, M_SONAME);
444 return (error);
445 #else /* SCTP */
446 return (EOPNOTSUPP);
447 #endif /* SCTP */
448 }
449
450 int
451 sys_sctp_generic_recvmsg(td, uap)
452 struct thread *td;
453 struct sctp_generic_recvmsg_args /* {
454 int sd,
455 struct iovec *iov,
456 int iovlen,
457 struct sockaddr *from,
458 __socklen_t *fromlenaddr,
459 struct sctp_sndrcvinfo *sinfo,
460 int *msg_flags
461 } */ *uap;
462 {
463 #if (defined(INET) || defined(INET6)) && defined(SCTP)
464 uint8_t sockbufstore[256];
465 struct uio auio;
466 struct iovec *iov, *tiov;
467 struct sctp_sndrcvinfo sinfo;
468 struct socket *so;
469 struct file *fp = NULL;
470 struct sockaddr *fromsa;
471 cap_rights_t rights;
472 #ifdef KTRACE
473 struct uio *ktruio = NULL;
474 #endif
475 ssize_t len;
476 int error, fromlen, i, msg_flags;
477
478 AUDIT_ARG_FD(uap->sd);
479 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_RECV),
480 &fp, NULL);
481 if (error != 0)
482 return (error);
483 #ifdef COMPAT_FREEBSD32
484 if (SV_CURPROC_FLAG(SV_ILP32))
485 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
486 uap->iovlen, &iov, EMSGSIZE);
487 else
488 #endif
489 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
490 if (error != 0)
491 goto out1;
492
493 so = fp->f_data;
494 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
495 error = EOPNOTSUPP;
496 goto out;
497 }
498 #ifdef MAC
499 error = mac_socket_check_receive(td->td_ucred, so);
500 if (error != 0)
501 goto out;
502 #endif /* MAC */
503
504 if (uap->fromlenaddr != NULL) {
505 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
506 if (error != 0)
507 goto out;
508 } else {
509 fromlen = 0;
510 }
511 if (uap->msg_flags) {
512 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
513 if (error != 0)
514 goto out;
515 } else {
516 msg_flags = 0;
517 }
518 auio.uio_iov = iov;
519 auio.uio_iovcnt = uap->iovlen;
520 auio.uio_segflg = UIO_USERSPACE;
521 auio.uio_rw = UIO_READ;
522 auio.uio_td = td;
523 auio.uio_offset = 0; /* XXX */
524 auio.uio_resid = 0;
525 tiov = iov;
526 for (i = 0; i <uap->iovlen; i++, tiov++) {
527 if ((auio.uio_resid += tiov->iov_len) < 0) {
528 error = EINVAL;
529 goto out;
530 }
531 }
532 len = auio.uio_resid;
533 fromsa = (struct sockaddr *)sockbufstore;
534
535 #ifdef KTRACE
536 if (KTRPOINT(td, KTR_GENIO))
537 ktruio = cloneuio(&auio);
538 #endif /* KTRACE */
539 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
540 CURVNET_SET(so->so_vnet);
541 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
542 fromsa, fromlen, &msg_flags,
543 (struct sctp_sndrcvinfo *)&sinfo, 1);
544 CURVNET_RESTORE();
545 if (error != 0) {
546 if (auio.uio_resid != len && (error == ERESTART ||
547 error == EINTR || error == EWOULDBLOCK))
548 error = 0;
549 } else {
550 if (uap->sinfo)
551 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
552 }
553 #ifdef KTRACE
554 if (ktruio != NULL) {
555 ktruio->uio_resid = len - auio.uio_resid;
556 ktrgenio(uap->sd, UIO_READ, ktruio, error);
557 }
558 #endif /* KTRACE */
559 if (error != 0)
560 goto out;
561 td->td_retval[0] = len - auio.uio_resid;
562
563 if (fromlen && uap->from) {
564 len = fromlen;
565 if (len <= 0 || fromsa == NULL)
566 len = 0;
567 else {
568 len = MIN(len, fromsa->sa_len);
569 error = copyout(fromsa, uap->from, (size_t)len);
570 if (error != 0)
571 goto out;
572 }
573 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
574 if (error != 0)
575 goto out;
576 }
577 #ifdef KTRACE
578 if (KTRPOINT(td, KTR_STRUCT))
579 ktrsockaddr(fromsa);
580 #endif
581 if (uap->msg_flags) {
582 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
583 if (error != 0)
584 goto out;
585 }
586 out:
587 free(iov, M_IOV);
588 out1:
589 if (fp != NULL)
590 fdrop(fp, td);
591
592 return (error);
593 #else /* SCTP */
594 return (EOPNOTSUPP);
595 #endif /* SCTP */
596 }
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