2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_capsicum.h"
39 #include "opt_inet6.h"
40 #include "opt_ktrace.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/capsicum.h>
45 #include <sys/kernel.h>
47 #include <sys/mutex.h>
48 #include <sys/sysproto.h>
49 #include <sys/malloc.h>
50 #include <sys/filedesc.h>
52 #include <sys/filio.h>
55 #include <sys/protosw.h>
56 #include <sys/rwlock.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/syscallsubr.h>
60 #include <sys/sysent.h>
63 #include <sys/unpcb.h>
65 #include <sys/ktrace.h>
67 #ifdef COMPAT_FREEBSD32
68 #include <compat/freebsd32/freebsd32_util.h>
73 #include <security/audit/audit.h>
74 #include <security/mac/mac_framework.h>
76 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
77 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
79 static int accept1(struct thread *td, int s, struct sockaddr *uname,
80 socklen_t *anamelen, int flags);
81 static int getsockname1(struct thread *td, struct getsockname_args *uap,
83 static int getpeername1(struct thread *td, struct getpeername_args *uap,
85 static int sockargs(struct mbuf **, char *, socklen_t, int);
88 * Convert a user file descriptor to a kernel file entry and check if required
89 * capability rights are present.
90 * If required copy of current set of capability rights is returned.
91 * A reference on the file entry is held upon returning.
94 getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
95 struct file **fpp, u_int *fflagp, struct filecaps *havecapsp)
100 error = fget_cap(td, fd, rightsp, &fp, havecapsp);
103 if (fp->f_type != DTYPE_SOCKET) {
105 if (havecapsp != NULL)
106 filecaps_free(havecapsp);
110 *fflagp = fp->f_flag;
116 * System call interface to the socket abstraction.
118 #if defined(COMPAT_43)
119 #define COMPAT_OLDSOCK
123 sys_socket(struct thread *td, struct socket_args *uap)
126 return (kern_socket(td, uap->domain, uap->type, uap->protocol));
130 kern_socket(struct thread *td, int domain, int type, int protocol)
134 int fd, error, oflag, fflag;
136 AUDIT_ARG_SOCKET(domain, type, protocol);
140 if ((type & SOCK_CLOEXEC) != 0) {
141 type &= ~SOCK_CLOEXEC;
144 if ((type & SOCK_NONBLOCK) != 0) {
145 type &= ~SOCK_NONBLOCK;
150 error = mac_socket_check_create(td->td_ucred, domain, type, protocol);
154 error = falloc(td, &fp, &fd, oflag);
157 /* An extra reference on `fp' has been held for us by falloc(). */
158 error = socreate(domain, &so, type, protocol, td->td_ucred, td);
162 finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops);
163 if ((fflag & FNONBLOCK) != 0)
164 (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td);
165 td->td_retval[0] = fd;
172 sys_bind(struct thread *td, struct bind_args *uap)
177 error = getsockaddr(&sa, uap->name, uap->namelen);
179 error = kern_bindat(td, AT_FDCWD, uap->s, sa);
186 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
192 #ifdef CAPABILITY_MODE
193 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD))
198 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
199 error = getsock_cap(td, fd, &cap_bind_rights,
205 if (KTRPOINT(td, KTR_STRUCT))
209 error = mac_socket_check_bind(td->td_ucred, so, sa);
212 if (dirfd == AT_FDCWD)
213 error = sobind(so, sa, td);
215 error = sobindat(dirfd, so, sa, td);
224 sys_bindat(struct thread *td, struct bindat_args *uap)
229 error = getsockaddr(&sa, uap->name, uap->namelen);
231 error = kern_bindat(td, uap->fd, uap->s, sa);
238 sys_listen(struct thread *td, struct listen_args *uap)
241 return (kern_listen(td, uap->s, uap->backlog));
245 kern_listen(struct thread *td, int s, int backlog)
252 error = getsock_cap(td, s, &cap_listen_rights,
257 error = mac_socket_check_listen(td->td_ucred, so);
260 error = solisten(so, backlog, td);
270 accept1(td, s, uname, anamelen, flags)
273 struct sockaddr *uname;
277 struct sockaddr *name;
283 return (kern_accept4(td, s, NULL, NULL, flags, NULL));
285 error = copyin(anamelen, &namelen, sizeof (namelen));
289 error = kern_accept4(td, s, &name, &namelen, flags, &fp);
294 if (error == 0 && uname != NULL) {
295 #ifdef COMPAT_OLDSOCK
296 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) &&
297 (flags & ACCEPT4_COMPAT) != 0)
298 ((struct osockaddr *)name)->sa_family =
301 error = copyout(name, uname, namelen);
304 error = copyout(&namelen, anamelen,
307 fdclose(td, fp, td->td_retval[0]);
309 free(name, M_SONAME);
314 kern_accept(struct thread *td, int s, struct sockaddr **name,
315 socklen_t *namelen, struct file **fp)
317 return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp));
321 kern_accept4(struct thread *td, int s, struct sockaddr **name,
322 socklen_t *namelen, int flags, struct file **fp)
324 struct file *headfp, *nfp = NULL;
325 struct sockaddr *sa = NULL;
326 struct socket *head, *so;
327 struct filecaps fcaps;
336 error = getsock_cap(td, s, &cap_accept_rights,
337 &headfp, &fflag, &fcaps);
340 head = headfp->f_data;
341 if (!SOLISTENING(head)) {
346 error = mac_socket_check_accept(td->td_ucred, head);
350 error = falloc_caps(td, &nfp, &fd,
351 (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0, &fcaps);
355 if (!SOLISTENING(head)) {
361 error = solisten_dequeue(head, &so, flags);
365 /* An extra reference on `nfp' has been held for us by falloc(). */
366 td->td_retval[0] = fd;
368 /* Connection has been removed from the listen queue. */
369 KNOTE_UNLOCKED(&head->so_rdsel.si_note, 0);
371 if (flags & ACCEPT4_INHERIT) {
372 pgid = fgetown(&head->so_sigio);
374 fsetown(pgid, &so->so_sigio);
376 fflag &= ~(FNONBLOCK | FASYNC);
377 if (flags & SOCK_NONBLOCK)
381 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
382 /* Sync socket nonblocking/async state with file flags */
383 tmp = fflag & FNONBLOCK;
384 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td);
385 tmp = fflag & FASYNC;
386 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td);
387 error = soaccept(so, &sa);
395 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa);
397 /* check sa_len before it is destroyed */
398 if (*namelen > sa->sa_len)
399 *namelen = sa->sa_len;
401 if (KTRPOINT(td, KTR_STRUCT))
411 * close the new descriptor, assuming someone hasn't ripped it
415 fdclose(td, nfp, fd);
418 * Release explicitly held references before returning. We return
419 * a reference on nfp to the caller on success if they request it.
423 filecaps_free(&fcaps);
440 struct accept_args *uap;
443 return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT));
449 struct accept4_args *uap;
452 if (uap->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
455 return (accept1(td, uap->s, uap->name, uap->anamelen, uap->flags));
458 #ifdef COMPAT_OLDSOCK
460 oaccept(struct thread *td, struct oaccept_args *uap)
463 return (accept1(td, uap->s, uap->name, uap->anamelen,
464 ACCEPT4_INHERIT | ACCEPT4_COMPAT));
466 #endif /* COMPAT_OLDSOCK */
469 sys_connect(struct thread *td, struct connect_args *uap)
474 error = getsockaddr(&sa, uap->name, uap->namelen);
476 error = kern_connectat(td, AT_FDCWD, uap->s, sa);
483 kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
487 int error, interrupted = 0;
489 #ifdef CAPABILITY_MODE
490 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD))
495 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
496 error = getsock_cap(td, fd, &cap_connect_rights,
501 if (so->so_state & SS_ISCONNECTING) {
506 if (KTRPOINT(td, KTR_STRUCT))
510 error = mac_socket_check_connect(td->td_ucred, so, sa);
514 error = soconnectat(dirfd, so, sa, td);
517 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
522 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
523 error = msleep(&so->so_timeo, &so->so_lock, PSOCK | PCATCH,
526 if (error == EINTR || error == ERESTART)
532 error = so->so_error;
538 so->so_state &= ~SS_ISCONNECTING;
539 if (error == ERESTART)
547 sys_connectat(struct thread *td, struct connectat_args *uap)
552 error = getsockaddr(&sa, uap->name, uap->namelen);
554 error = kern_connectat(td, uap->fd, uap->s, sa);
561 kern_socketpair(struct thread *td, int domain, int type, int protocol,
564 struct file *fp1, *fp2;
565 struct socket *so1, *so2;
566 int fd, error, oflag, fflag;
568 AUDIT_ARG_SOCKET(domain, type, protocol);
572 if ((type & SOCK_CLOEXEC) != 0) {
573 type &= ~SOCK_CLOEXEC;
576 if ((type & SOCK_NONBLOCK) != 0) {
577 type &= ~SOCK_NONBLOCK;
581 /* We might want to have a separate check for socket pairs. */
582 error = mac_socket_check_create(td->td_ucred, domain, type,
587 error = socreate(domain, &so1, type, protocol, td->td_ucred, td);
590 error = socreate(domain, &so2, type, protocol, td->td_ucred, td);
593 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */
594 error = falloc(td, &fp1, &fd, oflag);
598 fp1->f_data = so1; /* so1 already has ref count */
599 error = falloc(td, &fp2, &fd, oflag);
602 fp2->f_data = so2; /* so2 already has ref count */
604 error = soconnect2(so1, so2);
607 if (type == SOCK_DGRAM) {
609 * Datagram socket connection is asymmetric.
611 error = soconnect2(so2, so1);
614 } else if (so1->so_proto->pr_flags & PR_CONNREQUIRED) {
615 struct unpcb *unp, *unp2;
616 unp = sotounpcb(so1);
617 unp2 = sotounpcb(so2);
619 * No need to lock the unps, because the sockets are brand-new.
620 * No other threads can be using them yet
622 unp_copy_peercred(td, unp, unp2, unp);
624 finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data,
626 finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data,
628 if ((fflag & FNONBLOCK) != 0) {
629 (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td);
630 (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td);
636 fdclose(td, fp2, rsv[1]);
639 fdclose(td, fp1, rsv[0]);
651 sys_socketpair(struct thread *td, struct socketpair_args *uap)
655 error = kern_socketpair(td, uap->domain, uap->type,
659 error = copyout(sv, uap->rsv, 2 * sizeof(int));
661 (void)kern_close(td, sv[0]);
662 (void)kern_close(td, sv[1]);
668 sendit(struct thread *td, int s, struct msghdr *mp, int flags)
670 struct mbuf *control;
674 #ifdef CAPABILITY_MODE
675 if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL))
679 if (mp->msg_name != NULL) {
680 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
690 if (mp->msg_control) {
691 if (mp->msg_controllen < sizeof(struct cmsghdr)
692 #ifdef COMPAT_OLDSOCK
693 && (mp->msg_flags != MSG_COMPAT ||
694 !SV_PROC_FLAG(td->td_proc, SV_AOUT))
700 error = sockargs(&control, mp->msg_control,
701 mp->msg_controllen, MT_CONTROL);
704 #ifdef COMPAT_OLDSOCK
705 if (mp->msg_flags == MSG_COMPAT &&
706 SV_PROC_FLAG(td->td_proc, SV_AOUT)) {
709 M_PREPEND(control, sizeof(*cm), M_WAITOK);
710 cm = mtod(control, struct cmsghdr *);
711 cm->cmsg_len = control->m_len;
712 cm->cmsg_level = SOL_SOCKET;
713 cm->cmsg_type = SCM_RIGHTS;
720 error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
728 kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
729 struct mbuf *control, enum uio_seg segflg)
735 cap_rights_t *rights;
737 struct uio *ktruio = NULL;
743 rights = &cap_send_rights;
744 if (mp->msg_name != NULL) {
745 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name);
746 rights = &cap_send_connect_rights;
748 error = getsock_cap(td, s, rights, &fp, NULL, NULL);
753 so = (struct socket *)fp->f_data;
756 if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT))
757 ktrsockaddr(mp->msg_name);
760 if (mp->msg_name != NULL) {
761 error = mac_socket_check_connect(td->td_ucred, so,
768 error = mac_socket_check_send(td->td_ucred, so);
775 auio.uio_iov = mp->msg_iov;
776 auio.uio_iovcnt = mp->msg_iovlen;
777 auio.uio_segflg = segflg;
778 auio.uio_rw = UIO_WRITE;
780 auio.uio_offset = 0; /* XXX */
783 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
784 if ((auio.uio_resid += iov->iov_len) < 0) {
791 if (KTRPOINT(td, KTR_GENIO))
792 ktruio = cloneuio(&auio);
794 len = auio.uio_resid;
795 error = sosend(so, mp->msg_name, &auio, 0, control, flags, td);
797 if (auio.uio_resid != len && (error == ERESTART ||
798 error == EINTR || error == EWOULDBLOCK))
800 /* Generation of SIGPIPE can be controlled per socket */
801 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
802 !(flags & MSG_NOSIGNAL)) {
803 PROC_LOCK(td->td_proc);
804 tdsignal(td, SIGPIPE);
805 PROC_UNLOCK(td->td_proc);
809 td->td_retval[0] = len - auio.uio_resid;
811 if (ktruio != NULL) {
812 ktruio->uio_resid = td->td_retval[0];
813 ktrgenio(s, UIO_WRITE, ktruio, error);
822 sys_sendto(struct thread *td, struct sendto_args *uap)
827 msg.msg_name = __DECONST(void *, uap->to);
828 msg.msg_namelen = uap->tolen;
832 #ifdef COMPAT_OLDSOCK
833 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
836 aiov.iov_base = __DECONST(void *, uap->buf);
837 aiov.iov_len = uap->len;
838 return (sendit(td, uap->s, &msg, uap->flags));
841 #ifdef COMPAT_OLDSOCK
843 osend(struct thread *td, struct osend_args *uap)
852 aiov.iov_base = __DECONST(void *, uap->buf);
853 aiov.iov_len = uap->len;
856 return (sendit(td, uap->s, &msg, uap->flags));
860 osendmsg(struct thread *td, struct osendmsg_args *uap)
866 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
869 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
873 msg.msg_flags = MSG_COMPAT;
874 error = sendit(td, uap->s, &msg, uap->flags);
881 sys_sendmsg(struct thread *td, struct sendmsg_args *uap)
887 error = copyin(uap->msg, &msg, sizeof (msg));
890 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
894 #ifdef COMPAT_OLDSOCK
895 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
898 error = sendit(td, uap->s, &msg, uap->flags);
904 kern_recvit(struct thread *td, int s, struct msghdr *mp, enum uio_seg fromseg,
905 struct mbuf **controlp)
909 struct mbuf *control, *m;
913 struct sockaddr *fromsa = NULL;
915 struct uio *ktruio = NULL;
920 if (controlp != NULL)
924 error = getsock_cap(td, s, &cap_recv_rights,
931 error = mac_socket_check_receive(td->td_ucred, so);
938 auio.uio_iov = mp->msg_iov;
939 auio.uio_iovcnt = mp->msg_iovlen;
940 auio.uio_segflg = UIO_USERSPACE;
941 auio.uio_rw = UIO_READ;
943 auio.uio_offset = 0; /* XXX */
946 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
947 if ((auio.uio_resid += iov->iov_len) < 0) {
953 if (KTRPOINT(td, KTR_GENIO))
954 ktruio = cloneuio(&auio);
957 len = auio.uio_resid;
958 error = soreceive(so, &fromsa, &auio, NULL,
959 (mp->msg_control || controlp) ? &control : NULL,
962 if (auio.uio_resid != len && (error == ERESTART ||
963 error == EINTR || error == EWOULDBLOCK))
967 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa);
969 if (ktruio != NULL) {
970 ktruio->uio_resid = len - auio.uio_resid;
971 ktrgenio(s, UIO_READ, ktruio, error);
976 td->td_retval[0] = len - auio.uio_resid;
978 len = mp->msg_namelen;
979 if (len <= 0 || fromsa == NULL)
982 /* save sa_len before it is destroyed by MSG_COMPAT */
983 len = MIN(len, fromsa->sa_len);
984 #ifdef COMPAT_OLDSOCK
985 if ((mp->msg_flags & MSG_COMPAT) != 0 &&
986 SV_PROC_FLAG(td->td_proc, SV_AOUT))
987 ((struct osockaddr *)fromsa)->sa_family =
990 if (fromseg == UIO_USERSPACE) {
991 error = copyout(fromsa, mp->msg_name,
996 bcopy(fromsa, mp->msg_name, len);
998 mp->msg_namelen = len;
1000 if (mp->msg_control && controlp == NULL) {
1001 #ifdef COMPAT_OLDSOCK
1003 * We assume that old recvmsg calls won't receive access
1004 * rights and other control info, esp. as control info
1005 * is always optional and those options didn't exist in 4.3.
1006 * If we receive rights, trim the cmsghdr; anything else
1009 if (control && (mp->msg_flags & MSG_COMPAT) != 0 &&
1010 SV_PROC_FLAG(td->td_proc, SV_AOUT)) {
1011 if (mtod(control, struct cmsghdr *)->cmsg_level !=
1013 mtod(control, struct cmsghdr *)->cmsg_type !=
1015 mp->msg_controllen = 0;
1018 control->m_len -= sizeof (struct cmsghdr);
1019 control->m_data += sizeof (struct cmsghdr);
1022 ctlbuf = mp->msg_control;
1023 len = mp->msg_controllen;
1024 mp->msg_controllen = 0;
1025 for (m = control; m != NULL && len >= m->m_len; m = m->m_next) {
1026 if ((error = copyout(mtod(m, caddr_t), ctlbuf,
1032 mp->msg_controllen += m->m_len;
1035 mp->msg_flags |= MSG_CTRUNC;
1036 m_dispose_extcontrolm(m);
1042 if (fromsa && KTRPOINT(td, KTR_STRUCT))
1043 ktrsockaddr(fromsa);
1045 free(fromsa, M_SONAME);
1047 if (error == 0 && controlp != NULL)
1048 *controlp = control;
1049 else if (control != NULL) {
1051 m_dispose_extcontrolm(control);
1059 recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp)
1063 error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL);
1066 if (namelenp != NULL) {
1067 error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t));
1068 #ifdef COMPAT_OLDSOCK
1069 if ((mp->msg_flags & MSG_COMPAT) != 0 &&
1070 SV_PROC_FLAG(td->td_proc, SV_AOUT))
1071 error = 0; /* old recvfrom didn't check */
1078 sys_recvfrom(struct thread *td, struct recvfrom_args *uap)
1084 if (uap->fromlenaddr) {
1085 error = copyin(uap->fromlenaddr,
1086 &msg.msg_namelen, sizeof (msg.msg_namelen));
1090 msg.msg_namelen = 0;
1092 msg.msg_name = uap->from;
1093 msg.msg_iov = &aiov;
1095 aiov.iov_base = uap->buf;
1096 aiov.iov_len = uap->len;
1097 msg.msg_control = 0;
1098 msg.msg_flags = uap->flags;
1099 error = recvit(td, uap->s, &msg, uap->fromlenaddr);
1104 #ifdef COMPAT_OLDSOCK
1106 orecvfrom(struct thread *td, struct recvfrom_args *uap)
1109 uap->flags |= MSG_COMPAT;
1110 return (sys_recvfrom(td, uap));
1114 #ifdef COMPAT_OLDSOCK
1116 orecv(struct thread *td, struct orecv_args *uap)
1122 msg.msg_namelen = 0;
1123 msg.msg_iov = &aiov;
1125 aiov.iov_base = uap->buf;
1126 aiov.iov_len = uap->len;
1127 msg.msg_control = 0;
1128 msg.msg_flags = uap->flags;
1129 return (recvit(td, uap->s, &msg, NULL));
1133 * Old recvmsg. This code takes advantage of the fact that the old msghdr
1134 * overlays the new one, missing only the flags, and with the (old) access
1135 * rights where the control fields are now.
1138 orecvmsg(struct thread *td, struct orecvmsg_args *uap)
1144 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
1147 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1150 msg.msg_flags = uap->flags | MSG_COMPAT;
1152 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen);
1153 if (msg.msg_controllen && error == 0)
1154 error = copyout(&msg.msg_controllen,
1155 &uap->msg->msg_accrightslen, sizeof (int));
1162 sys_recvmsg(struct thread *td, struct recvmsg_args *uap)
1165 struct iovec *uiov, *iov;
1168 error = copyin(uap->msg, &msg, sizeof (msg));
1171 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1174 msg.msg_flags = uap->flags;
1175 #ifdef COMPAT_OLDSOCK
1176 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
1177 msg.msg_flags &= ~MSG_COMPAT;
1181 error = recvit(td, uap->s, &msg, NULL);
1184 error = copyout(&msg, uap->msg, sizeof(msg));
1191 sys_shutdown(struct thread *td, struct shutdown_args *uap)
1194 return (kern_shutdown(td, uap->s, uap->how));
1198 kern_shutdown(struct thread *td, int s, int how)
1205 error = getsock_cap(td, s, &cap_shutdown_rights,
1209 error = soshutdown(so, how);
1211 * Previous versions did not return ENOTCONN, but 0 in
1212 * case the socket was not connected. Some important
1213 * programs like syslogd up to r279016, 2015-02-19,
1214 * still depend on this behavior.
1216 if (error == ENOTCONN &&
1217 td->td_proc->p_osrel < P_OSREL_SHUTDOWN_ENOTCONN)
1225 sys_setsockopt(struct thread *td, struct setsockopt_args *uap)
1228 return (kern_setsockopt(td, uap->s, uap->level, uap->name,
1229 uap->val, UIO_USERSPACE, uap->valsize));
1233 kern_setsockopt(struct thread *td, int s, int level, int name, const void *val,
1234 enum uio_seg valseg, socklen_t valsize)
1238 struct sockopt sopt;
1241 if (val == NULL && valsize != 0)
1243 if ((int)valsize < 0)
1246 sopt.sopt_dir = SOPT_SET;
1247 sopt.sopt_level = level;
1248 sopt.sopt_name = name;
1249 sopt.sopt_val = __DECONST(void *, val);
1250 sopt.sopt_valsize = valsize;
1256 sopt.sopt_td = NULL;
1259 panic("kern_setsockopt called with bad valseg");
1263 error = getsock_cap(td, s, &cap_setsockopt_rights,
1267 error = sosetopt(so, &sopt);
1274 sys_getsockopt(struct thread *td, struct getsockopt_args *uap)
1280 error = copyin(uap->avalsize, &valsize, sizeof (valsize));
1285 error = kern_getsockopt(td, uap->s, uap->level, uap->name,
1286 uap->val, UIO_USERSPACE, &valsize);
1289 error = copyout(&valsize, uap->avalsize, sizeof (valsize));
1294 * Kernel version of getsockopt.
1295 * optval can be a userland or userspace. optlen is always a kernel pointer.
1298 kern_getsockopt(struct thread *td, int s, int level, int name, void *val,
1299 enum uio_seg valseg, socklen_t *valsize)
1303 struct sockopt sopt;
1308 if ((int)*valsize < 0)
1311 sopt.sopt_dir = SOPT_GET;
1312 sopt.sopt_level = level;
1313 sopt.sopt_name = name;
1314 sopt.sopt_val = val;
1315 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */
1321 sopt.sopt_td = NULL;
1324 panic("kern_getsockopt called with bad valseg");
1328 error = getsock_cap(td, s, &cap_getsockopt_rights,
1332 error = sogetopt(so, &sopt);
1333 *valsize = sopt.sopt_valsize;
1340 * getsockname1() - Get socket name.
1343 getsockname1(struct thread *td, struct getsockname_args *uap, int compat)
1345 struct sockaddr *sa;
1349 error = copyin(uap->alen, &len, sizeof(len));
1353 error = kern_getsockname(td, uap->fdes, &sa, &len);
1358 #ifdef COMPAT_OLDSOCK
1359 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT))
1360 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1362 error = copyout(sa, uap->asa, (u_int)len);
1366 error = copyout(&len, uap->alen, sizeof(len));
1371 kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
1380 error = getsock_cap(td, fd, &cap_getsockname_rights,
1386 CURVNET_SET(so->so_vnet);
1387 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa);
1394 len = MIN(*alen, (*sa)->sa_len);
1397 if (KTRPOINT(td, KTR_STRUCT))
1402 if (error != 0 && *sa != NULL) {
1403 free(*sa, M_SONAME);
1410 sys_getsockname(struct thread *td, struct getsockname_args *uap)
1413 return (getsockname1(td, uap, 0));
1416 #ifdef COMPAT_OLDSOCK
1418 ogetsockname(struct thread *td, struct getsockname_args *uap)
1421 return (getsockname1(td, uap, 1));
1423 #endif /* COMPAT_OLDSOCK */
1426 * getpeername1() - Get name of peer for connected socket.
1429 getpeername1(struct thread *td, struct getpeername_args *uap, int compat)
1431 struct sockaddr *sa;
1435 error = copyin(uap->alen, &len, sizeof (len));
1439 error = kern_getpeername(td, uap->fdes, &sa, &len);
1444 #ifdef COMPAT_OLDSOCK
1445 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT))
1446 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1448 error = copyout(sa, uap->asa, (u_int)len);
1452 error = copyout(&len, uap->alen, sizeof(len));
1457 kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
1466 error = getsock_cap(td, fd, &cap_getpeername_rights,
1471 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1476 CURVNET_SET(so->so_vnet);
1477 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa);
1484 len = MIN(*alen, (*sa)->sa_len);
1487 if (KTRPOINT(td, KTR_STRUCT))
1491 if (error != 0 && *sa != NULL) {
1492 free(*sa, M_SONAME);
1501 sys_getpeername(struct thread *td, struct getpeername_args *uap)
1504 return (getpeername1(td, uap, 0));
1507 #ifdef COMPAT_OLDSOCK
1509 ogetpeername(struct thread *td, struct ogetpeername_args *uap)
1512 /* XXX uap should have type `getpeername_args *' to begin with. */
1513 return (getpeername1(td, (struct getpeername_args *)uap, 1));
1515 #endif /* COMPAT_OLDSOCK */
1518 sockargs(struct mbuf **mp, char *buf, socklen_t buflen, int type)
1520 struct sockaddr *sa;
1524 if (buflen > MLEN) {
1525 #ifdef COMPAT_OLDSOCK
1526 if (type == MT_SONAME && buflen <= 112 &&
1527 SV_CURPROC_FLAG(SV_AOUT))
1528 buflen = MLEN; /* unix domain compat. hack */
1531 if (buflen > MCLBYTES)
1534 m = m_get2(buflen, M_WAITOK, type, 0);
1536 error = copyin(buf, mtod(m, void *), buflen);
1541 if (type == MT_SONAME) {
1542 sa = mtod(m, struct sockaddr *);
1544 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1545 if (sa->sa_family == 0 && sa->sa_len < AF_MAX &&
1546 SV_CURPROC_FLAG(SV_AOUT))
1547 sa->sa_family = sa->sa_len;
1549 sa->sa_len = buflen;
1556 getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr, size_t len)
1558 struct sockaddr *sa;
1561 if (len > SOCK_MAXADDRLEN)
1562 return (ENAMETOOLONG);
1563 if (len < offsetof(struct sockaddr, sa_data[0]))
1565 sa = malloc(len, M_SONAME, M_WAITOK);
1566 error = copyin(uaddr, sa, len);
1570 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1571 if (sa->sa_family == 0 && sa->sa_len < AF_MAX &&
1572 SV_CURPROC_FLAG(SV_AOUT))
1573 sa->sa_family = sa->sa_len;
1582 * Dispose of externalized rights from an SCM_RIGHTS message. This function
1583 * should be used in error or truncation cases to avoid leaking file descriptors
1584 * into the recipient's (the current thread's) table.
1587 m_dispose_extcontrolm(struct mbuf *m)
1592 socklen_t clen, datalen;
1593 int error, fd, *fds, nfd;
1596 for (; m != NULL; m = m->m_next) {
1597 if (m->m_type != MT_EXTCONTROL)
1599 cm = mtod(m, struct cmsghdr *);
1602 if (clen < sizeof(*cm))
1603 panic("%s: truncated mbuf %p", __func__, m);
1604 datalen = CMSG_SPACE(cm->cmsg_len - CMSG_SPACE(0));
1606 panic("%s: truncated mbuf %p", __func__, m);
1608 if (cm->cmsg_level == SOL_SOCKET &&
1609 cm->cmsg_type == SCM_RIGHTS) {
1610 fds = (int *)CMSG_DATA(cm);
1611 nfd = (cm->cmsg_len - CMSG_SPACE(0)) /
1616 error = fget(td, fd, &cap_no_rights,
1619 fdclose(td, fp, fd);
1625 cm = (struct cmsghdr *)((uint8_t *)cm + datalen);
1627 m_chtype(m, MT_CONTROL);