FreeBSD kernel IPv4 code
sctp_syscalls.c
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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
84static 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
93static 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
102int
103sctp_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
119SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
120#endif
121
122int
123sctp_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 */
141int
142sys_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_cap(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF),
157 &headfp, &fflag, NULL);
158 if (error != 0)
159 goto done2;
160 head = headfp->f_data;
161 if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
162 error = EOPNOTSUPP;
163 goto done;
164 }
165 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
166 if (error != 0)
167 goto done;
168 /*
169 * At this point we know we do have a assoc to pull
170 * we proceed to get the fd setup. This may block
171 * but that is ok.
172 */
173
174 error = falloc(td, &nfp, &fd, 0);
175 if (error != 0)
176 goto done;
177 td->td_retval[0] = fd;
178
179 CURVNET_SET(head->so_vnet);
180 so = sopeeloff(head);
181 if (so == NULL) {
182 error = ENOMEM;
183 goto noconnection;
184 }
185 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
186 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
187 if (error != 0)
188 goto noconnection;
189 if (head->so_sigio != NULL)
190 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
191
192noconnection:
193 /*
194 * close the new descriptor, assuming someone hasn't ripped it
195 * out from under us.
196 */
197 if (error != 0)
198 fdclose(td, nfp, fd);
199
200 /*
201 * Release explicitly held references before returning.
202 */
203 CURVNET_RESTORE();
204done:
205 if (nfp != NULL)
206 fdrop(nfp, td);
207 fdrop(headfp, td);
208done2:
209 return (error);
210}
211
212int
213sys_sctp_generic_sendmsg (td, uap)
214 struct thread *td;
215 struct sctp_generic_sendmsg_args /* {
216 int sd,
217 caddr_t msg,
218 int mlen,
219 caddr_t to,
220 __socklen_t tolen,
221 struct sctp_sndrcvinfo *sinfo,
222 int flags
223 } */ *uap;
224{
225 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
226 struct socket *so;
227 struct file *fp = NULL;
228 struct sockaddr *to = NULL;
229#ifdef KTRACE
230 struct uio *ktruio = NULL;
231#endif
232 struct uio auio;
233 struct iovec iov[1];
234 cap_rights_t rights;
235 int error = 0, len;
236
237 if (uap->sinfo != NULL) {
238 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
239 if (error != 0)
240 return (error);
241 u_sinfo = &sinfo;
242 }
243
244 cap_rights_init_one(&rights, CAP_SEND);
245 if (uap->tolen != 0) {
246 error = getsockaddr(&to, uap->to, uap->tolen);
247 if (error != 0) {
248 to = NULL;
249 goto sctp_bad2;
250 }
251 cap_rights_set_one(&rights, CAP_CONNECT);
252 }
253
254 AUDIT_ARG_FD(uap->sd);
255 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL);
256 if (error != 0)
257 goto sctp_bad;
258#ifdef KTRACE
259 if (to && (KTRPOINT(td, KTR_STRUCT)))
260 ktrsockaddr(to);
261#endif
262
263 iov[0].iov_base = uap->msg;
264 iov[0].iov_len = uap->mlen;
265
266 so = (struct socket *)fp->f_data;
267 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
268 error = EOPNOTSUPP;
269 goto sctp_bad;
270 }
271#ifdef MAC
272 error = mac_socket_check_send(td->td_ucred, so);
273 if (error != 0)
274 goto sctp_bad;
275#endif /* MAC */
276
277 auio.uio_iov = iov;
278 auio.uio_iovcnt = 1;
279 auio.uio_segflg = UIO_USERSPACE;
280 auio.uio_rw = UIO_WRITE;
281 auio.uio_td = td;
282 auio.uio_offset = 0; /* XXX */
283 auio.uio_resid = 0;
284#ifdef KTRACE
285 if (KTRPOINT(td, KTR_GENIO))
286 ktruio = cloneuio(&auio);
287#endif /* KTRACE */
288 len = auio.uio_resid = uap->mlen;
289 CURVNET_SET(so->so_vnet);
290 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
291 (struct mbuf *)NULL, uap->flags, u_sinfo, td);
292 CURVNET_RESTORE();
293 if (error != 0) {
294 if (auio.uio_resid != len && (error == ERESTART ||
295 error == EINTR || error == EWOULDBLOCK))
296 error = 0;
297 /* Generation of SIGPIPE can be controlled per socket. */
298 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
299 !(uap->flags & MSG_NOSIGNAL)) {
300 PROC_LOCK(td->td_proc);
301 tdsignal(td, SIGPIPE);
302 PROC_UNLOCK(td->td_proc);
303 }
304 }
305 if (error == 0)
306 td->td_retval[0] = len - auio.uio_resid;
307#ifdef KTRACE
308 if (ktruio != NULL) {
309 ktruio->uio_resid = td->td_retval[0];
310 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
311 }
312#endif /* KTRACE */
313sctp_bad:
314 if (fp != NULL)
315 fdrop(fp, td);
316sctp_bad2:
317 free(to, M_SONAME);
318 return (error);
319}
320
321int
322sys_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 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_one(&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_one(&rights, CAP_CONNECT);
361 }
362
363 AUDIT_ARG_FD(uap->sd);
364 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, 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 */
437sctp_bad:
438 free(iov, M_IOV);
439sctp_bad1:
440 if (fp != NULL)
441 fdrop(fp, td);
442sctp_bad2:
443 free(to, M_SONAME);
444 return (error);
445}
446
447int
448sys_sctp_generic_recvmsg(td, uap)
449 struct thread *td;
450 struct sctp_generic_recvmsg_args /* {
451 int sd,
452 struct iovec *iov,
453 int iovlen,
454 struct sockaddr *from,
455 __socklen_t *fromlenaddr,
456 struct sctp_sndrcvinfo *sinfo,
457 int *msg_flags
458 } */ *uap;
459{
460 uint8_t sockbufstore[256];
461 struct uio auio;
462 struct iovec *iov, *tiov;
463 struct sctp_sndrcvinfo sinfo;
464 struct socket *so;
465 struct file *fp = NULL;
466 struct sockaddr *fromsa;
467 cap_rights_t rights;
468#ifdef KTRACE
469 struct uio *ktruio = NULL;
470#endif
471 ssize_t len;
472 int error, fromlen, i, msg_flags;
473
474 AUDIT_ARG_FD(uap->sd);
475 error = getsock_cap(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
476 &fp, NULL, NULL);
477 if (error != 0)
478 return (error);
479#ifdef COMPAT_FREEBSD32
480 if (SV_CURPROC_FLAG(SV_ILP32))
481 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
482 uap->iovlen, &iov, EMSGSIZE);
483 else
484#endif
485 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
486 if (error != 0)
487 goto out1;
488
489 so = fp->f_data;
490 if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
491 error = EOPNOTSUPP;
492 goto out;
493 }
494#ifdef MAC
495 error = mac_socket_check_receive(td->td_ucred, so);
496 if (error != 0)
497 goto out;
498#endif /* MAC */
499
500 if (uap->fromlenaddr != NULL) {
501 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
502 if (error != 0)
503 goto out;
504 } else {
505 fromlen = 0;
506 }
507 if (uap->msg_flags) {
508 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
509 if (error != 0)
510 goto out;
511 } else {
512 msg_flags = 0;
513 }
514 auio.uio_iov = iov;
515 auio.uio_iovcnt = uap->iovlen;
516 auio.uio_segflg = UIO_USERSPACE;
517 auio.uio_rw = UIO_READ;
518 auio.uio_td = td;
519 auio.uio_offset = 0; /* XXX */
520 auio.uio_resid = 0;
521 tiov = iov;
522 for (i = 0; i <uap->iovlen; i++, tiov++) {
523 if ((auio.uio_resid += tiov->iov_len) < 0) {
524 error = EINVAL;
525 goto out;
526 }
527 }
528 len = auio.uio_resid;
529 fromsa = (struct sockaddr *)sockbufstore;
530
531#ifdef KTRACE
532 if (KTRPOINT(td, KTR_GENIO))
533 ktruio = cloneuio(&auio);
534#endif /* KTRACE */
535 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
536 CURVNET_SET(so->so_vnet);
537 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
538 fromsa, fromlen, &msg_flags,
539 (struct sctp_sndrcvinfo *)&sinfo, 1);
540 CURVNET_RESTORE();
541 if (error != 0) {
542 if (auio.uio_resid != len && (error == ERESTART ||
543 error == EINTR || error == EWOULDBLOCK))
544 error = 0;
545 } else {
546 if (uap->sinfo)
547 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
548 }
549#ifdef KTRACE
550 if (ktruio != NULL) {
551 ktruio->uio_resid = len - auio.uio_resid;
552 ktrgenio(uap->sd, UIO_READ, ktruio, error);
553 }
554#endif /* KTRACE */
555 if (error != 0)
556 goto out;
557 td->td_retval[0] = len - auio.uio_resid;
558
559 if (fromlen && uap->from) {
560 len = fromlen;
561 if (len <= 0 || fromsa == NULL)
562 len = 0;
563 else {
564 len = MIN(len, fromsa->sa_len);
565 error = copyout(fromsa, uap->from, (size_t)len);
566 if (error != 0)
567 goto out;
568 }
569 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
570 if (error != 0)
571 goto out;
572 }
573#ifdef KTRACE
574 if (KTRPOINT(td, KTR_STRUCT))
575 ktrsockaddr(fromsa);
576#endif
577 if (uap->msg_flags) {
578 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
579 if (error != 0)
580 goto out;
581 }
582out:
583 free(iov, M_IOV);
584out1:
585 if (fp != NULL)
586 fdrop(fp, td);
587
588 return (error);
589}
SYSINIT
SYSINIT(cc, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, cc_init, NULL)
uint8_t
__uint8_t uint8_t
Definition: in.h:52
socklen_t
__socklen_t socklen_t
Definition: in.h:90
IPPROTO_SCTP
#define IPPROTO_SCTP
Definition: sctp_constants.h:845
sctp_os_bsd.h
sctp_lower_sosend
int sctp_lower_sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, struct mbuf *i_pak, struct mbuf *control, int flags, struct sctp_sndrcvinfo *srcv, struct thread *p)
Definition: sctp_output.c:12489
sctp_do_peeloff
int sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
Definition: sctp_peeloff.c:89
sctp_can_peel_off
int sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
Definition: sctp_peeloff.c:51
sctp_peeloff.h
sctp_syscalls
static struct syscall_helper_data sctp_syscalls[]
Definition: sctp_syscalls.c:84
sys_sctp_generic_recvmsg
int sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap)
Definition: sctp_syscalls.c:448
sys_sctp_generic_sendmsg_iov
int sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap)
Definition: sctp_syscalls.c:322
sys_sctp_generic_sendmsg
int sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap)
Definition: sctp_syscalls.c:213
__FBSDID
__FBSDID("$FreeBSD$")
sctp_syscalls_init
int sctp_syscalls_init(void)
Definition: sctp_syscalls.c:103
sys_sctp_peeloff
int sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap)
Definition: sctp_syscalls.c:142
sctp_syscalls_uninit
int sctp_syscalls_uninit(void)
Definition: sctp_syscalls.c:123
sctp_assoc_t
uint32_t sctp_assoc_t
Definition: sctp_uio.h:48
sctp_sorecvmsg
int sctp_sorecvmsg(struct socket *so, struct uio *uio, struct mbuf **mp, struct sockaddr *from, int fromlen, int *msg_flags, struct sctp_sndrcvinfo *sinfo, int filling_sinfo)
Definition: sctputil.c:5477
sctp_peeloff
int sctp_peeloff(struct socket *, struct socket *, int, caddr_t, int *)
sctp_sndrcvinfo
Definition: sctp_uio.h:116