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.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
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
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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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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 #include "opt_capsicum.h"
35 #include "opt_inet6.h"
36 #include "opt_ktrace.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/capsicum.h>
41 #include <sys/kernel.h>
43 #include <sys/mutex.h>
44 #include <sys/sysproto.h>
45 #include <sys/malloc.h>
46 #include <sys/filedesc.h>
48 #include <sys/filio.h>
51 #include <sys/protosw.h>
52 #include <sys/rwlock.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/syscallsubr.h>
57 #include <sys/sysent.h>
61 #include <sys/unpcb.h>
63 #include <sys/ktrace.h>
65 #ifdef COMPAT_FREEBSD32
66 #include <compat/freebsd32/freebsd32_util.h>
71 #include <security/audit/audit.h>
72 #include <security/mac/mac_framework.h>
74 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
75 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
77 static int accept1(struct thread *td, int s, struct sockaddr *uname,
78 socklen_t *anamelen, int flags);
79 static int sockargs(struct mbuf **, char *, socklen_t, int);
82 * Convert a user file descriptor to a kernel file entry and check if required
83 * capability rights are present.
84 * If required copy of current set of capability rights is returned.
85 * A reference on the file entry is held upon returning.
88 getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
89 struct file **fpp, struct filecaps *havecapsp)
94 error = fget_cap(td, fd, rightsp, &fp, havecapsp);
95 if (__predict_false(error != 0))
97 if (__predict_false(fp->f_type != DTYPE_SOCKET)) {
99 if (havecapsp != NULL)
100 filecaps_free(havecapsp);
108 getsock(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
113 error = fget_unlocked(td, fd, rightsp, &fp);
114 if (__predict_false(error != 0))
116 if (__predict_false(fp->f_type != DTYPE_SOCKET)) {
125 * System call interface to the socket abstraction.
127 #if defined(COMPAT_43)
128 #define COMPAT_OLDSOCK
132 sys_socket(struct thread *td, struct socket_args *uap)
135 return (kern_socket(td, uap->domain, uap->type, uap->protocol));
139 kern_socket(struct thread *td, int domain, int type, int protocol)
143 int fd, error, oflag, fflag;
145 AUDIT_ARG_SOCKET(domain, type, protocol);
149 if ((type & SOCK_CLOEXEC) != 0) {
150 type &= ~SOCK_CLOEXEC;
153 if ((type & SOCK_NONBLOCK) != 0) {
154 type &= ~SOCK_NONBLOCK;
159 error = mac_socket_check_create(td->td_ucred, domain, type, protocol);
163 error = falloc(td, &fp, &fd, oflag);
166 /* An extra reference on `fp' has been held for us by falloc(). */
167 error = socreate(domain, &so, type, protocol, td->td_ucred, td);
171 finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops);
172 if ((fflag & FNONBLOCK) != 0)
173 (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td);
174 td->td_retval[0] = fd;
181 sys_bind(struct thread *td, struct bind_args *uap)
186 error = getsockaddr(&sa, uap->name, uap->namelen);
188 error = kern_bindat(td, AT_FDCWD, uap->s, sa);
195 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
201 #ifdef CAPABILITY_MODE
202 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD))
207 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
208 error = getsock(td, fd, &cap_bind_rights, &fp);
213 if (KTRPOINT(td, KTR_STRUCT))
217 error = mac_socket_check_bind(td->td_ucred, so, sa);
220 if (dirfd == AT_FDCWD)
221 error = sobind(so, sa, td);
223 error = sobindat(dirfd, so, sa, td);
232 sys_bindat(struct thread *td, struct bindat_args *uap)
237 error = getsockaddr(&sa, uap->name, uap->namelen);
239 error = kern_bindat(td, uap->fd, uap->s, sa);
246 sys_listen(struct thread *td, struct listen_args *uap)
249 return (kern_listen(td, uap->s, uap->backlog));
253 kern_listen(struct thread *td, int s, int backlog)
260 error = getsock(td, s, &cap_listen_rights, &fp);
264 error = mac_socket_check_listen(td->td_ucred, so);
267 error = solisten(so, backlog, td);
277 accept1(struct thread *td, int s, struct sockaddr *uname, socklen_t *anamelen,
280 struct sockaddr *name;
286 return (kern_accept4(td, s, NULL, NULL, flags, NULL));
288 error = copyin(anamelen, &namelen, sizeof (namelen));
292 error = kern_accept4(td, s, &name, &namelen, flags, &fp);
297 #ifdef COMPAT_OLDSOCK
298 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) &&
299 (flags & ACCEPT4_COMPAT) != 0)
300 ((struct osockaddr *)name)->sa_family =
303 error = copyout(name, uname, namelen);
305 error = copyout(&namelen, anamelen,
308 fdclose(td, fp, td->td_retval[0]);
310 free(name, M_SONAME);
315 kern_accept(struct thread *td, int s, struct sockaddr **name,
316 socklen_t *namelen, struct file **fp)
318 return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp));
322 kern_accept4(struct thread *td, int s, struct sockaddr **name,
323 socklen_t *namelen, int flags, struct file **fp)
325 struct file *headfp, *nfp = NULL;
326 struct sockaddr *sa = NULL;
327 struct socket *head, *so;
328 struct filecaps fcaps;
337 error = getsock_cap(td, s, &cap_accept_rights,
341 fflag = atomic_load_int(&headfp->f_flag);
342 head = headfp->f_data;
343 if (!SOLISTENING(head)) {
348 error = mac_socket_check_accept(td->td_ucred, head);
352 error = falloc_caps(td, &nfp, &fd,
353 (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0, &fcaps);
357 if (!SOLISTENING(head)) {
363 error = solisten_dequeue(head, &so, flags);
367 /* An extra reference on `nfp' has been held for us by falloc(). */
368 td->td_retval[0] = fd;
370 /* Connection has been removed from the listen queue. */
371 KNOTE_UNLOCKED(&head->so_rdsel.si_note, 0);
373 if (flags & ACCEPT4_INHERIT) {
374 pgid = fgetown(&head->so_sigio);
376 fsetown(pgid, &so->so_sigio);
378 fflag &= ~(FNONBLOCK | FASYNC);
379 if (flags & SOCK_NONBLOCK)
383 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
384 /* Sync socket nonblocking/async state with file flags */
385 tmp = fflag & FNONBLOCK;
386 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td);
387 tmp = fflag & FASYNC;
388 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td);
389 error = soaccept(so, &sa);
397 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa);
399 /* check sa_len before it is destroyed */
400 if (*namelen > sa->sa_len)
401 *namelen = sa->sa_len;
403 if (KTRPOINT(td, KTR_STRUCT))
413 * close the new descriptor, assuming someone hasn't ripped it
417 fdclose(td, nfp, fd);
420 * Release explicitly held references before returning. We return
421 * a reference on nfp to the caller on success if they request it.
425 filecaps_free(&fcaps);
440 sys_accept(struct thread *td, struct accept_args *uap)
443 return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT));
447 sys_accept4(struct thread *td, struct accept4_args *uap)
450 if (uap->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
453 return (accept1(td, uap->s, uap->name, uap->anamelen, uap->flags));
456 #ifdef COMPAT_OLDSOCK
458 oaccept(struct thread *td, struct oaccept_args *uap)
461 return (accept1(td, uap->s, uap->name, uap->anamelen,
462 ACCEPT4_INHERIT | ACCEPT4_COMPAT));
464 #endif /* COMPAT_OLDSOCK */
467 sys_connect(struct thread *td, struct connect_args *uap)
472 error = getsockaddr(&sa, uap->name, uap->namelen);
474 error = kern_connectat(td, AT_FDCWD, uap->s, sa);
481 kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
487 #ifdef CAPABILITY_MODE
488 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD))
493 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
494 error = getsock(td, fd, &cap_connect_rights, &fp);
498 if (so->so_state & SS_ISCONNECTING) {
503 if (KTRPOINT(td, KTR_STRUCT))
507 error = mac_socket_check_connect(td->td_ucred, so, sa);
511 error = soconnectat(dirfd, so, sa, td);
514 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
519 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
520 error = msleep(&so->so_timeo, &so->so_lock, PSOCK | PCATCH,
526 error = so->so_error;
531 if (error == ERESTART)
539 sys_connectat(struct thread *td, struct connectat_args *uap)
544 error = getsockaddr(&sa, uap->name, uap->namelen);
546 error = kern_connectat(td, uap->fd, uap->s, sa);
553 kern_socketpair(struct thread *td, int domain, int type, int protocol,
556 struct file *fp1, *fp2;
557 struct socket *so1, *so2;
558 int fd, error, oflag, fflag;
560 AUDIT_ARG_SOCKET(domain, type, protocol);
564 if ((type & SOCK_CLOEXEC) != 0) {
565 type &= ~SOCK_CLOEXEC;
568 if ((type & SOCK_NONBLOCK) != 0) {
569 type &= ~SOCK_NONBLOCK;
573 /* We might want to have a separate check for socket pairs. */
574 error = mac_socket_check_create(td->td_ucred, domain, type,
579 error = socreate(domain, &so1, type, protocol, td->td_ucred, td);
582 error = socreate(domain, &so2, type, protocol, td->td_ucred, td);
585 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */
586 error = falloc(td, &fp1, &fd, oflag);
590 fp1->f_data = so1; /* so1 already has ref count */
591 error = falloc(td, &fp2, &fd, oflag);
594 fp2->f_data = so2; /* so2 already has ref count */
596 error = soconnect2(so1, so2);
599 if (type == SOCK_DGRAM) {
601 * Datagram socket connection is asymmetric.
603 error = soconnect2(so2, so1);
606 } else if (so1->so_proto->pr_flags & PR_CONNREQUIRED) {
607 struct unpcb *unp, *unp2;
608 unp = sotounpcb(so1);
609 unp2 = sotounpcb(so2);
611 * No need to lock the unps, because the sockets are brand-new.
612 * No other threads can be using them yet
614 unp_copy_peercred(td, unp, unp2, unp);
616 finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data,
618 finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data,
620 if ((fflag & FNONBLOCK) != 0) {
621 (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td);
622 (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td);
628 fdclose(td, fp2, rsv[1]);
631 fdclose(td, fp1, rsv[0]);
643 sys_socketpair(struct thread *td, struct socketpair_args *uap)
647 error = kern_socketpair(td, uap->domain, uap->type,
651 error = copyout(sv, uap->rsv, 2 * sizeof(int));
653 (void)kern_close(td, sv[0]);
654 (void)kern_close(td, sv[1]);
660 sendit(struct thread *td, int s, struct msghdr *mp, int flags)
662 struct mbuf *control;
666 #ifdef CAPABILITY_MODE
667 if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL))
671 if (mp->msg_name != NULL) {
672 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
682 if (mp->msg_control) {
683 if (mp->msg_controllen < sizeof(struct cmsghdr)
684 #ifdef COMPAT_OLDSOCK
685 && (mp->msg_flags != MSG_COMPAT ||
686 !SV_PROC_FLAG(td->td_proc, SV_AOUT))
692 error = sockargs(&control, mp->msg_control,
693 mp->msg_controllen, MT_CONTROL);
696 #ifdef COMPAT_OLDSOCK
697 if (mp->msg_flags == MSG_COMPAT &&
698 SV_PROC_FLAG(td->td_proc, SV_AOUT)) {
701 M_PREPEND(control, sizeof(*cm), M_WAITOK);
702 cm = mtod(control, struct cmsghdr *);
703 cm->cmsg_len = control->m_len;
704 cm->cmsg_level = SOL_SOCKET;
705 cm->cmsg_type = SCM_RIGHTS;
712 error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
720 kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
721 struct mbuf *control, enum uio_seg segflg)
727 cap_rights_t *rights;
729 struct uio *ktruio = NULL;
735 rights = &cap_send_rights;
736 if (mp->msg_name != NULL) {
737 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name);
738 rights = &cap_send_connect_rights;
740 error = getsock(td, s, rights, &fp);
745 so = (struct socket *)fp->f_data;
748 if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT))
749 ktrsockaddr(mp->msg_name);
752 if (mp->msg_name != NULL) {
753 error = mac_socket_check_connect(td->td_ucred, so,
760 error = mac_socket_check_send(td->td_ucred, so);
767 auio.uio_iov = mp->msg_iov;
768 auio.uio_iovcnt = mp->msg_iovlen;
769 auio.uio_segflg = segflg;
770 auio.uio_rw = UIO_WRITE;
772 auio.uio_offset = 0; /* XXX */
775 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
776 if ((auio.uio_resid += iov->iov_len) < 0) {
783 if (KTRPOINT(td, KTR_GENIO))
784 ktruio = cloneuio(&auio);
786 len = auio.uio_resid;
787 error = sousrsend(so, mp->msg_name, &auio, control, flags, NULL);
789 td->td_retval[0] = len - auio.uio_resid;
791 if (ktruio != NULL) {
792 ktruio->uio_resid = td->td_retval[0];
793 ktrgenio(s, UIO_WRITE, ktruio, error);
802 sys_sendto(struct thread *td, struct sendto_args *uap)
807 msg.msg_name = __DECONST(void *, uap->to);
808 msg.msg_namelen = uap->tolen;
812 #ifdef COMPAT_OLDSOCK
813 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
816 aiov.iov_base = __DECONST(void *, uap->buf);
817 aiov.iov_len = uap->len;
818 return (sendit(td, uap->s, &msg, uap->flags));
821 #ifdef COMPAT_OLDSOCK
823 osend(struct thread *td, struct osend_args *uap)
832 aiov.iov_base = __DECONST(void *, uap->buf);
833 aiov.iov_len = uap->len;
836 return (sendit(td, uap->s, &msg, uap->flags));
840 osendmsg(struct thread *td, struct osendmsg_args *uap)
846 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
849 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
853 msg.msg_flags = MSG_COMPAT;
854 error = sendit(td, uap->s, &msg, uap->flags);
861 sys_sendmsg(struct thread *td, struct sendmsg_args *uap)
867 error = copyin(uap->msg, &msg, sizeof (msg));
870 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
874 #ifdef COMPAT_OLDSOCK
875 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
878 error = sendit(td, uap->s, &msg, uap->flags);
884 kern_recvit(struct thread *td, int s, struct msghdr *mp, enum uio_seg fromseg,
885 struct mbuf **controlp)
889 struct mbuf *control, *m;
893 struct sockaddr *fromsa = NULL;
895 struct uio *ktruio = NULL;
900 if (controlp != NULL)
904 error = getsock(td, s, &cap_recv_rights, &fp);
910 error = mac_socket_check_receive(td->td_ucred, so);
917 auio.uio_iov = mp->msg_iov;
918 auio.uio_iovcnt = mp->msg_iovlen;
919 auio.uio_segflg = UIO_USERSPACE;
920 auio.uio_rw = UIO_READ;
922 auio.uio_offset = 0; /* XXX */
925 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
926 if ((auio.uio_resid += iov->iov_len) < 0) {
932 if (KTRPOINT(td, KTR_GENIO))
933 ktruio = cloneuio(&auio);
936 len = auio.uio_resid;
937 error = soreceive(so, &fromsa, &auio, NULL,
938 (mp->msg_control || controlp) ? &control : NULL,
941 if (auio.uio_resid != len && (error == ERESTART ||
942 error == EINTR || error == EWOULDBLOCK))
946 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa);
948 if (ktruio != NULL) {
949 /* MSG_TRUNC can trigger underflow of uio_resid. */
950 ktruio->uio_resid = MIN(len - auio.uio_resid, len);
951 ktrgenio(s, UIO_READ, ktruio, error);
956 td->td_retval[0] = len - auio.uio_resid;
958 len = mp->msg_namelen;
959 if (len <= 0 || fromsa == NULL)
962 /* save sa_len before it is destroyed by MSG_COMPAT */
963 len = MIN(len, fromsa->sa_len);
964 #ifdef COMPAT_OLDSOCK
965 if ((mp->msg_flags & MSG_COMPAT) != 0 &&
966 SV_PROC_FLAG(td->td_proc, SV_AOUT))
967 ((struct osockaddr *)fromsa)->sa_family =
970 if (fromseg == UIO_USERSPACE) {
971 error = copyout(fromsa, mp->msg_name,
976 bcopy(fromsa, mp->msg_name, len);
978 mp->msg_namelen = len;
980 if (mp->msg_control && controlp == NULL) {
981 #ifdef COMPAT_OLDSOCK
983 * We assume that old recvmsg calls won't receive access
984 * rights and other control info, esp. as control info
985 * is always optional and those options didn't exist in 4.3.
986 * If we receive rights, trim the cmsghdr; anything else
989 if (control && (mp->msg_flags & MSG_COMPAT) != 0 &&
990 SV_PROC_FLAG(td->td_proc, SV_AOUT)) {
991 if (mtod(control, struct cmsghdr *)->cmsg_level !=
993 mtod(control, struct cmsghdr *)->cmsg_type !=
995 mp->msg_controllen = 0;
998 control->m_len -= sizeof (struct cmsghdr);
999 control->m_data += sizeof (struct cmsghdr);
1002 ctlbuf = mp->msg_control;
1003 len = mp->msg_controllen;
1004 mp->msg_controllen = 0;
1005 for (m = control; m != NULL && len >= m->m_len; m = m->m_next) {
1006 if ((error = copyout(mtod(m, caddr_t), ctlbuf,
1012 mp->msg_controllen += m->m_len;
1015 mp->msg_flags |= MSG_CTRUNC;
1016 m_dispose_extcontrolm(m);
1022 if (fromsa && KTRPOINT(td, KTR_STRUCT))
1023 ktrsockaddr(fromsa);
1025 free(fromsa, M_SONAME);
1027 if (error == 0 && controlp != NULL)
1028 *controlp = control;
1029 else if (control != NULL) {
1031 m_dispose_extcontrolm(control);
1039 recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp)
1043 error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL);
1046 if (namelenp != NULL) {
1047 error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t));
1048 #ifdef COMPAT_OLDSOCK
1049 if ((mp->msg_flags & MSG_COMPAT) != 0 &&
1050 SV_PROC_FLAG(td->td_proc, SV_AOUT))
1051 error = 0; /* old recvfrom didn't check */
1058 kern_recvfrom(struct thread *td, int s, void *buf, size_t len, int flags,
1059 struct sockaddr *from, socklen_t *fromlenaddr)
1065 if (fromlenaddr != NULL) {
1066 error = copyin(fromlenaddr, &msg.msg_namelen,
1067 sizeof (msg.msg_namelen));
1071 msg.msg_namelen = 0;
1073 msg.msg_name = from;
1074 msg.msg_iov = &aiov;
1076 aiov.iov_base = buf;
1078 msg.msg_control = 0;
1079 msg.msg_flags = flags;
1080 error = recvit(td, s, &msg, fromlenaddr);
1086 sys_recvfrom(struct thread *td, struct recvfrom_args *uap)
1088 return (kern_recvfrom(td, uap->s, uap->buf, uap->len,
1089 uap->flags, uap->from, uap->fromlenaddr));
1093 #ifdef COMPAT_OLDSOCK
1095 orecvfrom(struct thread *td, struct orecvfrom_args *uap)
1097 return (kern_recvfrom(td, uap->s, uap->buf, uap->len,
1098 uap->flags | MSG_COMPAT, uap->from, uap->fromlenaddr));
1102 #ifdef COMPAT_OLDSOCK
1104 orecv(struct thread *td, struct orecv_args *uap)
1110 msg.msg_namelen = 0;
1111 msg.msg_iov = &aiov;
1113 aiov.iov_base = uap->buf;
1114 aiov.iov_len = uap->len;
1115 msg.msg_control = 0;
1116 msg.msg_flags = uap->flags;
1117 return (recvit(td, uap->s, &msg, NULL));
1121 * Old recvmsg. This code takes advantage of the fact that the old msghdr
1122 * overlays the new one, missing only the flags, and with the (old) access
1123 * rights where the control fields are now.
1126 orecvmsg(struct thread *td, struct orecvmsg_args *uap)
1132 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
1135 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1138 msg.msg_flags = uap->flags | MSG_COMPAT;
1140 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen);
1141 if (msg.msg_controllen && error == 0)
1142 error = copyout(&msg.msg_controllen,
1143 &uap->msg->msg_accrightslen, sizeof (int));
1150 sys_recvmsg(struct thread *td, struct recvmsg_args *uap)
1153 struct iovec *uiov, *iov;
1156 error = copyin(uap->msg, &msg, sizeof (msg));
1159 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1162 msg.msg_flags = uap->flags;
1163 #ifdef COMPAT_OLDSOCK
1164 if (SV_PROC_FLAG(td->td_proc, SV_AOUT))
1165 msg.msg_flags &= ~MSG_COMPAT;
1169 error = recvit(td, uap->s, &msg, NULL);
1172 error = copyout(&msg, uap->msg, sizeof(msg));
1179 sys_shutdown(struct thread *td, struct shutdown_args *uap)
1182 return (kern_shutdown(td, uap->s, uap->how));
1186 kern_shutdown(struct thread *td, int s, int how)
1193 error = getsock(td, s, &cap_shutdown_rights, &fp);
1196 error = soshutdown(so, how);
1198 * Previous versions did not return ENOTCONN, but 0 in
1199 * case the socket was not connected. Some important
1200 * programs like syslogd up to r279016, 2015-02-19,
1201 * still depend on this behavior.
1203 if (error == ENOTCONN &&
1204 td->td_proc->p_osrel < P_OSREL_SHUTDOWN_ENOTCONN)
1212 sys_setsockopt(struct thread *td, struct setsockopt_args *uap)
1215 return (kern_setsockopt(td, uap->s, uap->level, uap->name,
1216 uap->val, UIO_USERSPACE, uap->valsize));
1220 kern_setsockopt(struct thread *td, int s, int level, int name, const void *val,
1221 enum uio_seg valseg, socklen_t valsize)
1225 struct sockopt sopt;
1228 if (val == NULL && valsize != 0)
1230 if ((int)valsize < 0)
1233 sopt.sopt_dir = SOPT_SET;
1234 sopt.sopt_level = level;
1235 sopt.sopt_name = name;
1236 sopt.sopt_val = __DECONST(void *, val);
1237 sopt.sopt_valsize = valsize;
1243 sopt.sopt_td = NULL;
1246 panic("kern_setsockopt called with bad valseg");
1250 error = getsock(td, s, &cap_setsockopt_rights, &fp);
1253 error = sosetopt(so, &sopt);
1260 sys_getsockopt(struct thread *td, struct getsockopt_args *uap)
1266 error = copyin(uap->avalsize, &valsize, sizeof (valsize));
1271 error = kern_getsockopt(td, uap->s, uap->level, uap->name,
1272 uap->val, UIO_USERSPACE, &valsize);
1275 error = copyout(&valsize, uap->avalsize, sizeof (valsize));
1280 * Kernel version of getsockopt.
1281 * optval can be a userland or userspace. optlen is always a kernel pointer.
1284 kern_getsockopt(struct thread *td, int s, int level, int name, void *val,
1285 enum uio_seg valseg, socklen_t *valsize)
1289 struct sockopt sopt;
1294 if ((int)*valsize < 0)
1297 sopt.sopt_dir = SOPT_GET;
1298 sopt.sopt_level = level;
1299 sopt.sopt_name = name;
1300 sopt.sopt_val = val;
1301 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */
1307 sopt.sopt_td = NULL;
1310 panic("kern_getsockopt called with bad valseg");
1314 error = getsock(td, s, &cap_getsockopt_rights, &fp);
1317 error = sogetopt(so, &sopt);
1318 *valsize = sopt.sopt_valsize;
1325 user_getsockname(struct thread *td, int fdes, struct sockaddr *asa,
1326 socklen_t *alen, bool compat)
1328 struct sockaddr *sa;
1332 error = copyin(alen, &len, sizeof(len));
1336 error = kern_getsockname(td, fdes, &sa, &len);
1341 #ifdef COMPAT_OLDSOCK
1342 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT))
1343 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1345 error = copyout(sa, asa, len);
1349 error = copyout(&len, alen, sizeof(len));
1354 kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
1363 error = getsock(td, fd, &cap_getsockname_rights, &fp);
1368 CURVNET_SET(so->so_vnet);
1369 error = so->so_proto->pr_sockaddr(so, sa);
1376 len = MIN(*alen, (*sa)->sa_len);
1379 if (KTRPOINT(td, KTR_STRUCT))
1384 if (error != 0 && *sa != NULL) {
1385 free(*sa, M_SONAME);
1392 sys_getsockname(struct thread *td, struct getsockname_args *uap)
1394 return (user_getsockname(td, uap->fdes, uap->asa, uap->alen, false));
1397 #ifdef COMPAT_OLDSOCK
1399 ogetsockname(struct thread *td, struct ogetsockname_args *uap)
1401 return (user_getsockname(td, uap->fdes, uap->asa, uap->alen, true));
1403 #endif /* COMPAT_OLDSOCK */
1406 user_getpeername(struct thread *td, int fdes, struct sockaddr *asa,
1407 socklen_t *alen, bool compat)
1409 struct sockaddr *sa;
1413 error = copyin(alen, &len, sizeof (len));
1417 error = kern_getpeername(td, fdes, &sa, &len);
1422 #ifdef COMPAT_OLDSOCK
1423 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT))
1424 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1426 error = copyout(sa, asa, len);
1430 error = copyout(&len, alen, sizeof(len));
1435 kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
1444 error = getsock(td, fd, &cap_getpeername_rights, &fp);
1448 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1453 CURVNET_SET(so->so_vnet);
1454 error = so->so_proto->pr_peeraddr(so, sa);
1461 len = MIN(*alen, (*sa)->sa_len);
1464 if (KTRPOINT(td, KTR_STRUCT))
1468 if (error != 0 && *sa != NULL) {
1469 free(*sa, M_SONAME);
1478 sys_getpeername(struct thread *td, struct getpeername_args *uap)
1480 return (user_getpeername(td, uap->fdes, uap->asa, uap->alen, false));
1483 #ifdef COMPAT_OLDSOCK
1485 ogetpeername(struct thread *td, struct ogetpeername_args *uap)
1487 return (user_getpeername(td, uap->fdes, uap->asa, uap->alen, true));
1489 #endif /* COMPAT_OLDSOCK */
1492 sockargs(struct mbuf **mp, char *buf, socklen_t buflen, int type)
1494 struct sockaddr *sa;
1498 if (buflen > MLEN) {
1499 #ifdef COMPAT_OLDSOCK
1500 if (type == MT_SONAME && buflen <= 112 &&
1501 SV_CURPROC_FLAG(SV_AOUT))
1502 buflen = MLEN; /* unix domain compat. hack */
1505 if (buflen > MCLBYTES)
1508 m = m_get2(buflen, M_WAITOK, type, 0);
1510 error = copyin(buf, mtod(m, void *), buflen);
1515 if (type == MT_SONAME) {
1516 sa = mtod(m, struct sockaddr *);
1518 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1519 if (sa->sa_family == 0 && sa->sa_len < AF_MAX &&
1520 SV_CURPROC_FLAG(SV_AOUT))
1521 sa->sa_family = sa->sa_len;
1523 sa->sa_len = buflen;
1530 getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr, size_t len)
1532 struct sockaddr *sa;
1535 if (len > SOCK_MAXADDRLEN)
1536 return (ENAMETOOLONG);
1537 if (len < offsetof(struct sockaddr, sa_data[0]))
1539 sa = malloc(len, M_SONAME, M_WAITOK);
1540 error = copyin(uaddr, sa, len);
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;
1556 * Dispose of externalized rights from an SCM_RIGHTS message. This function
1557 * should be used in error or truncation cases to avoid leaking file descriptors
1558 * into the recipient's (the current thread's) table.
1561 m_dispose_extcontrolm(struct mbuf *m)
1566 socklen_t clen, datalen;
1567 int error, fd, *fds, nfd;
1570 for (; m != NULL; m = m->m_next) {
1571 if (m->m_type != MT_EXTCONTROL)
1573 cm = mtod(m, struct cmsghdr *);
1576 if (clen < sizeof(*cm))
1577 panic("%s: truncated mbuf %p", __func__, m);
1578 datalen = CMSG_SPACE(cm->cmsg_len - CMSG_SPACE(0));
1580 panic("%s: truncated mbuf %p", __func__, m);
1582 if (cm->cmsg_level == SOL_SOCKET &&
1583 cm->cmsg_type == SCM_RIGHTS) {
1584 fds = (int *)CMSG_DATA(cm);
1585 nfd = (cm->cmsg_len - CMSG_SPACE(0)) /
1590 error = fget(td, fd, &cap_no_rights,
1593 fdclose(td, fp, fd);
1599 cm = (struct cmsghdr *)((uint8_t *)cm + datalen);
1601 m_chtype(m, MT_CONTROL);