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/11.2/sys/netinet/sctp_syscalls.c 321322 2017-07-21 06:48:47Z kib $");
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_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 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 *headfp, *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 = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_PEELOFF),
132 &headfp, &fflag, NULL);
133 if (error != 0)
134 goto done2;
135 head = headfp->f_data;
136 if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
137 error = EOPNOTSUPP;
138 goto done;
139 }
140 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
141 if (error != 0)
142 goto done;
143 /*
144 * At this point we know we do have a assoc to pull
145 * we proceed to get the fd setup. This may block
146 * but that is ok.
147 */
148
149 error = falloc(td, &nfp, &fd, 0);
150 if (error != 0)
151 goto done;
152 td->td_retval[0] = fd;
153
154 CURVNET_SET(head->so_vnet);
155 so = sonewconn(head, SS_ISCONNECTED);
156 if (so == NULL) {
157 error = ENOMEM;
158 goto noconnection;
159 }
160 /*
161 * Before changing the flags on the socket, we have to bump the
162 * reference count. Otherwise, if the protocol calls sofree(),
163 * the socket will be released due to a zero refcount.
164 */
165 SOCK_LOCK(so);
166 soref(so); /* file descriptor reference */
167 SOCK_UNLOCK(so);
168
169 ACCEPT_LOCK();
170
171 TAILQ_REMOVE(&head->so_comp, so, so_list);
172 head->so_qlen--;
173 so->so_state |= (head->so_state & SS_NBIO);
174 so->so_state &= ~SS_NOFDREF;
175 so->so_qstate &= ~SQ_COMP;
176 so->so_head = NULL;
177 ACCEPT_UNLOCK();
178 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
179 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
180 if (error != 0)
181 goto noconnection;
182 if (head->so_sigio != NULL)
183 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
184
185 noconnection:
186 /*
187 * close the new descriptor, assuming someone hasn't ripped it
188 * out from under us.
189 */
190 if (error != 0)
191 fdclose(td, nfp, fd);
192
193 /*
194 * Release explicitly held references before returning.
195 */
196 CURVNET_RESTORE();
197 done:
198 if (nfp != NULL)
199 fdrop(nfp, td);
200 fdrop(headfp, td);
201 done2:
202 return (error);
203 #else /* SCTP */
204 return (EOPNOTSUPP);
205 #endif /* SCTP */
206 }
207
208 int
209 sys_sctp_generic_sendmsg (td, uap)
210 struct thread *td;
211 struct sctp_generic_sendmsg_args /* {
212 int sd,
213 caddr_t msg,
214 int mlen,
215 caddr_t to,
216 __socklen_t tolen,
217 struct sctp_sndrcvinfo *sinfo,
218 int flags
219 } */ *uap;
220 {
221 #if (defined(INET) || defined(INET6)) && defined(SCTP)
222 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
223 struct socket *so;
224 struct file *fp = NULL;
225 struct sockaddr *to = NULL;
226 #ifdef KTRACE
227 struct uio *ktruio = NULL;
228 #endif
229 struct uio auio;
230 struct iovec iov[1];
231 cap_rights_t rights;
232 int error = 0, len;
233
234 if (uap->sinfo != NULL) {
235 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
236 if (error != 0)
237 return (error);
238 u_sinfo = &sinfo;
239 }
240
241 cap_rights_init(&rights, CAP_SEND);
242 if (uap->tolen != 0) {
243 error = getsockaddr(&to, uap->to, uap->tolen);
244 if (error != 0) {
245 to = NULL;
246 goto sctp_bad2;
247 }
248 cap_rights_set(&rights, CAP_CONNECT);
249 }
250
251 AUDIT_ARG_FD(uap->sd);
252 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL);
253 if (error != 0)
254 goto sctp_bad;
255 #ifdef KTRACE
256 if (to && (KTRPOINT(td, KTR_STRUCT)))
257 ktrsockaddr(to);
258 #endif
259
260 iov[0].iov_base = uap->msg;
261 iov[0].iov_len = uap->mlen;
262
263 so = (struct socket *)fp->f_data;
264 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
265 error = EOPNOTSUPP;
266 goto sctp_bad;
267 }
268 #ifdef MAC
269 error = mac_socket_check_send(td->td_ucred, so);
270 if (error != 0)
271 goto sctp_bad;
272 #endif /* MAC */
273
274 auio.uio_iov = iov;
275 auio.uio_iovcnt = 1;
276 auio.uio_segflg = UIO_USERSPACE;
277 auio.uio_rw = UIO_WRITE;
278 auio.uio_td = td;
279 auio.uio_offset = 0; /* XXX */
280 auio.uio_resid = 0;
281 #ifdef KTRACE
282 if (KTRPOINT(td, KTR_GENIO))
283 ktruio = cloneuio(&auio);
284 #endif /* KTRACE */
285 len = auio.uio_resid = uap->mlen;
286 CURVNET_SET(so->so_vnet);
287 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
288 (struct mbuf *)NULL, uap->flags, u_sinfo, td);
289 CURVNET_RESTORE();
290 if (error != 0) {
291 if (auio.uio_resid != len && (error == ERESTART ||
292 error == EINTR || error == EWOULDBLOCK))
293 error = 0;
294 /* Generation of SIGPIPE can be controlled per socket. */
295 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
296 !(uap->flags & MSG_NOSIGNAL)) {
297 PROC_LOCK(td->td_proc);
298 tdsignal(td, SIGPIPE);
299 PROC_UNLOCK(td->td_proc);
300 }
301 }
302 if (error == 0)
303 td->td_retval[0] = len - auio.uio_resid;
304 #ifdef KTRACE
305 if (ktruio != NULL) {
306 ktruio->uio_resid = td->td_retval[0];
307 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
308 }
309 #endif /* KTRACE */
310 sctp_bad:
311 if (fp != NULL)
312 fdrop(fp, td);
313 sctp_bad2:
314 free(to, M_SONAME);
315 return (error);
316 #else /* SCTP */
317 return (EOPNOTSUPP);
318 #endif /* SCTP */
319 }
320
321 int
322 sys_sctp_generic_sendmsg_iov(td, uap)
323 struct thread *td;
324 struct sctp_generic_sendmsg_iov_args /* {
325 int sd,
326 struct iovec *iov,
327 int iovlen,
328 caddr_t to,
329 __socklen_t tolen,
330 struct sctp_sndrcvinfo *sinfo,
331 int flags
332 } */ *uap;
333 {
334 #if (defined(INET) || defined(INET6)) && defined(SCTP)
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(&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(&rights, CAP_CONNECT);
362 }
363
364 AUDIT_ARG_FD(uap->sd);
365 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL);
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 #else /* SCTP */
447 return (EOPNOTSUPP);
448 #endif /* SCTP */
449 }
450
451 int
452 sys_sctp_generic_recvmsg(td, uap)
453 struct thread *td;
454 struct sctp_generic_recvmsg_args /* {
455 int sd,
456 struct iovec *iov,
457 int iovlen,
458 struct sockaddr *from,
459 __socklen_t *fromlenaddr,
460 struct sctp_sndrcvinfo *sinfo,
461 int *msg_flags
462 } */ *uap;
463 {
464 #if (defined(INET) || defined(INET6)) && defined(SCTP)
465 uint8_t sockbufstore[256];
466 struct uio auio;
467 struct iovec *iov, *tiov;
468 struct sctp_sndrcvinfo sinfo;
469 struct socket *so;
470 struct file *fp = NULL;
471 struct sockaddr *fromsa;
472 cap_rights_t rights;
473 #ifdef KTRACE
474 struct uio *ktruio = NULL;
475 #endif
476 ssize_t len;
477 int error, fromlen, i, msg_flags;
478
479 AUDIT_ARG_FD(uap->sd);
480 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_RECV),
481 &fp, NULL, NULL);
482 if (error != 0)
483 return (error);
484 #ifdef COMPAT_FREEBSD32
485 if (SV_CURPROC_FLAG(SV_ILP32))
486 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
487 uap->iovlen, &iov, EMSGSIZE);
488 else
489 #endif
490 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
491 if (error != 0)
492 goto out1;
493
494 so = fp->f_data;
495 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
496 error = EOPNOTSUPP;
497 goto out;
498 }
499 #ifdef MAC
500 error = mac_socket_check_receive(td->td_ucred, so);
501 if (error != 0)
502 goto out;
503 #endif /* MAC */
504
505 if (uap->fromlenaddr != NULL) {
506 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
507 if (error != 0)
508 goto out;
509 } else {
510 fromlen = 0;
511 }
512 if (uap->msg_flags) {
513 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
514 if (error != 0)
515 goto out;
516 } else {
517 msg_flags = 0;
518 }
519 auio.uio_iov = iov;
520 auio.uio_iovcnt = uap->iovlen;
521 auio.uio_segflg = UIO_USERSPACE;
522 auio.uio_rw = UIO_READ;
523 auio.uio_td = td;
524 auio.uio_offset = 0; /* XXX */
525 auio.uio_resid = 0;
526 tiov = iov;
527 for (i = 0; i <uap->iovlen; i++, tiov++) {
528 if ((auio.uio_resid += tiov->iov_len) < 0) {
529 error = EINVAL;
530 goto out;
531 }
532 }
533 len = auio.uio_resid;
534 fromsa = (struct sockaddr *)sockbufstore;
535
536 #ifdef KTRACE
537 if (KTRPOINT(td, KTR_GENIO))
538 ktruio = cloneuio(&auio);
539 #endif /* KTRACE */
540 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
541 CURVNET_SET(so->so_vnet);
542 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
543 fromsa, fromlen, &msg_flags,
544 (struct sctp_sndrcvinfo *)&sinfo, 1);
545 CURVNET_RESTORE();
546 if (error != 0) {
547 if (auio.uio_resid != len && (error == ERESTART ||
548 error == EINTR || error == EWOULDBLOCK))
549 error = 0;
550 } else {
551 if (uap->sinfo)
552 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
553 }
554 #ifdef KTRACE
555 if (ktruio != NULL) {
556 ktruio->uio_resid = len - auio.uio_resid;
557 ktrgenio(uap->sd, UIO_READ, ktruio, error);
558 }
559 #endif /* KTRACE */
560 if (error != 0)
561 goto out;
562 td->td_retval[0] = len - auio.uio_resid;
563
564 if (fromlen && uap->from) {
565 len = fromlen;
566 if (len <= 0 || fromsa == NULL)
567 len = 0;
568 else {
569 len = MIN(len, fromsa->sa_len);
570 error = copyout(fromsa, uap->from, (size_t)len);
571 if (error != 0)
572 goto out;
573 }
574 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
575 if (error != 0)
576 goto out;
577 }
578 #ifdef KTRACE
579 if (KTRPOINT(td, KTR_STRUCT))
580 ktrsockaddr(fromsa);
581 #endif
582 if (uap->msg_flags) {
583 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
584 if (error != 0)
585 goto out;
586 }
587 out:
588 free(iov, M_IOV);
589 out1:
590 if (fp != NULL)
591 fdrop(fp, td);
592
593 return (error);
594 #else /* SCTP */
595 return (EOPNOTSUPP);
596 #endif /* SCTP */
597 }
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