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.
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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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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>
62 #include <sys/unpcb.h>
64 #include <sys/ktrace.h>
66 #ifdef COMPAT_FREEBSD32
67 #include <compat/freebsd32/freebsd32_util.h>
72 #include <security/audit/audit.h>
73 #include <security/mac/mac_framework.h>
75 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
76 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
78 static int accept1(struct thread *td, int s, struct sockaddr *uname,
79 socklen_t *anamelen, int flags);
80 static int getsockname1(struct thread *td, struct getsockname_args *uap,
82 static int getpeername1(struct thread *td, struct getpeername_args *uap,
84 static int sockargs(struct mbuf **, char *, socklen_t, int);
87 * Convert a user file descriptor to a kernel file entry and check if required
88 * capability rights are present.
89 * If required copy of current set of capability rights is returned.
90 * A reference on the file entry is held upon returning.
93 getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
94 struct file **fpp, u_int *fflagp, struct filecaps *havecapsp)
99 error = fget_cap(td, fd, rightsp, &fp, havecapsp);
102 if (fp->f_type != DTYPE_SOCKET) {
104 if (havecapsp != NULL)
105 filecaps_free(havecapsp);
109 *fflagp = fp->f_flag;
115 * System call interface to the socket abstraction.
117 #if defined(COMPAT_43)
118 #define COMPAT_OLDSOCK
122 sys_socket(struct thread *td, struct socket_args *uap)
125 return (kern_socket(td, uap->domain, uap->type, uap->protocol));
129 kern_socket(struct thread *td, int domain, int type, int protocol)
133 int fd, error, oflag, fflag;
135 AUDIT_ARG_SOCKET(domain, type, protocol);
139 if ((type & SOCK_CLOEXEC) != 0) {
140 type &= ~SOCK_CLOEXEC;
143 if ((type & SOCK_NONBLOCK) != 0) {
144 type &= ~SOCK_NONBLOCK;
149 error = mac_socket_check_create(td->td_ucred, domain, type, protocol);
153 error = falloc(td, &fp, &fd, oflag);
156 /* An extra reference on `fp' has been held for us by falloc(). */
157 error = socreate(domain, &so, type, protocol, td->td_ucred, td);
161 finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops);
162 if ((fflag & FNONBLOCK) != 0)
163 (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td);
164 td->td_retval[0] = fd;
171 sys_bind(struct thread *td, struct bind_args *uap)
176 error = getsockaddr(&sa, uap->name, uap->namelen);
178 error = kern_bindat(td, AT_FDCWD, uap->s, sa);
185 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
191 #ifdef CAPABILITY_MODE
192 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD))
197 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
198 error = getsock_cap(td, fd, &cap_bind_rights,
204 if (KTRPOINT(td, KTR_STRUCT))
208 error = mac_socket_check_bind(td->td_ucred, so, sa);
211 if (dirfd == AT_FDCWD)
212 error = sobind(so, sa, td);
214 error = sobindat(dirfd, so, sa, td);
223 sys_bindat(struct thread *td, struct bindat_args *uap)
228 error = getsockaddr(&sa, uap->name, uap->namelen);
230 error = kern_bindat(td, uap->fd, uap->s, sa);
237 sys_listen(struct thread *td, struct listen_args *uap)
240 return (kern_listen(td, uap->s, uap->backlog));
244 kern_listen(struct thread *td, int s, int backlog)
251 error = getsock_cap(td, s, &cap_listen_rights,
256 error = mac_socket_check_listen(td->td_ucred, so);
259 error = solisten(so, backlog, td);
269 accept1(td, s, uname, anamelen, flags)
272 struct sockaddr *uname;
276 struct sockaddr *name;
282 return (kern_accept4(td, s, NULL, NULL, flags, NULL));
284 error = copyin(anamelen, &namelen, sizeof (namelen));
288 error = kern_accept4(td, s, &name, &namelen, flags, &fp);
293 if (error == 0 && uname != NULL) {
294 #ifdef COMPAT_OLDSOCK
295 if (flags & ACCEPT4_COMPAT)
296 ((struct osockaddr *)name)->sa_family =
299 error = copyout(name, uname, namelen);
302 error = copyout(&namelen, anamelen,
305 fdclose(td, fp, td->td_retval[0]);
307 free(name, M_SONAME);
312 kern_accept(struct thread *td, int s, struct sockaddr **name,
313 socklen_t *namelen, struct file **fp)
315 return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp));
319 kern_accept4(struct thread *td, int s, struct sockaddr **name,
320 socklen_t *namelen, int flags, struct file **fp)
322 struct file *headfp, *nfp = NULL;
323 struct sockaddr *sa = NULL;
324 struct socket *head, *so;
325 struct filecaps fcaps;
334 error = getsock_cap(td, s, &cap_accept_rights,
335 &headfp, &fflag, &fcaps);
338 head = headfp->f_data;
339 if ((head->so_options & SO_ACCEPTCONN) == 0) {
344 error = mac_socket_check_accept(td->td_ucred, head);
348 error = falloc_caps(td, &nfp, &fd,
349 (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0, &fcaps);
353 if (!SOLISTENING(head)) {
359 error = solisten_dequeue(head, &so, flags);
363 /* An extra reference on `nfp' has been held for us by falloc(). */
364 td->td_retval[0] = fd;
366 /* Connection has been removed from the listen queue. */
367 KNOTE_UNLOCKED(&head->so_rdsel.si_note, 0);
369 if (flags & ACCEPT4_INHERIT) {
370 pgid = fgetown(&head->so_sigio);
372 fsetown(pgid, &so->so_sigio);
374 fflag &= ~(FNONBLOCK | FASYNC);
375 if (flags & SOCK_NONBLOCK)
379 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
380 /* Sync socket nonblocking/async state with file flags */
381 tmp = fflag & FNONBLOCK;
382 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td);
383 tmp = fflag & FASYNC;
384 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td);
385 error = soaccept(so, &sa);
393 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa);
395 /* check sa_len before it is destroyed */
396 if (*namelen > sa->sa_len)
397 *namelen = sa->sa_len;
399 if (KTRPOINT(td, KTR_STRUCT))
409 * close the new descriptor, assuming someone hasn't ripped it
413 fdclose(td, nfp, fd);
416 * Release explicitly held references before returning. We return
417 * a reference on nfp to the caller on success if they request it.
421 filecaps_free(&fcaps);
438 struct accept_args *uap;
441 return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT));
447 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
460 struct accept_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 if (dirfd == AT_FDCWD)
515 error = soconnect(so, sa, td);
517 error = soconnectat(dirfd, so, sa, td);
520 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
525 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
526 error = msleep(&so->so_timeo, &so->so_lock, PSOCK | PCATCH,
529 if (error == EINTR || error == ERESTART)
535 error = so->so_error;
541 so->so_state &= ~SS_ISCONNECTING;
542 if (error == ERESTART)
550 sys_connectat(struct thread *td, struct connectat_args *uap)
555 error = getsockaddr(&sa, uap->name, uap->namelen);
557 error = kern_connectat(td, uap->fd, uap->s, sa);
564 kern_socketpair(struct thread *td, int domain, int type, int protocol,
567 struct file *fp1, *fp2;
568 struct socket *so1, *so2;
569 int fd, error, oflag, fflag;
571 AUDIT_ARG_SOCKET(domain, type, protocol);
575 if ((type & SOCK_CLOEXEC) != 0) {
576 type &= ~SOCK_CLOEXEC;
579 if ((type & SOCK_NONBLOCK) != 0) {
580 type &= ~SOCK_NONBLOCK;
584 /* We might want to have a separate check for socket pairs. */
585 error = mac_socket_check_create(td->td_ucred, domain, type,
590 error = socreate(domain, &so1, type, protocol, td->td_ucred, td);
593 error = socreate(domain, &so2, type, protocol, td->td_ucred, td);
596 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */
597 error = falloc(td, &fp1, &fd, oflag);
601 fp1->f_data = so1; /* so1 already has ref count */
602 error = falloc(td, &fp2, &fd, oflag);
605 fp2->f_data = so2; /* so2 already has ref count */
607 error = soconnect2(so1, so2);
610 if (type == SOCK_DGRAM) {
612 * Datagram socket connection is asymmetric.
614 error = soconnect2(so2, so1);
617 } else if (so1->so_proto->pr_flags & PR_CONNREQUIRED) {
618 struct unpcb *unp, *unp2;
619 unp = sotounpcb(so1);
620 unp2 = sotounpcb(so2);
622 * No need to lock the unps, because the sockets are brand-new.
623 * No other threads can be using them yet
625 unp_copy_peercred(td, unp, unp2, unp);
627 finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data,
629 finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data,
631 if ((fflag & FNONBLOCK) != 0) {
632 (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td);
633 (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td);
639 fdclose(td, fp2, rsv[1]);
642 fdclose(td, fp1, rsv[0]);
654 sys_socketpair(struct thread *td, struct socketpair_args *uap)
658 error = kern_socketpair(td, uap->domain, uap->type,
662 error = copyout(sv, uap->rsv, 2 * sizeof(int));
664 (void)kern_close(td, sv[0]);
665 (void)kern_close(td, sv[1]);
671 sendit(struct thread *td, int s, struct msghdr *mp, int flags)
673 struct mbuf *control;
677 #ifdef CAPABILITY_MODE
678 if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL))
682 if (mp->msg_name != NULL) {
683 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
693 if (mp->msg_control) {
694 if (mp->msg_controllen < sizeof(struct cmsghdr)
695 #ifdef COMPAT_OLDSOCK
696 && mp->msg_flags != MSG_COMPAT
702 error = sockargs(&control, mp->msg_control,
703 mp->msg_controllen, MT_CONTROL);
706 #ifdef COMPAT_OLDSOCK
707 if (mp->msg_flags == MSG_COMPAT) {
710 M_PREPEND(control, sizeof(*cm), M_WAITOK);
711 cm = mtod(control, struct cmsghdr *);
712 cm->cmsg_len = control->m_len;
713 cm->cmsg_level = SOL_SOCKET;
714 cm->cmsg_type = SCM_RIGHTS;
721 error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
729 kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
730 struct mbuf *control, enum uio_seg segflg)
736 cap_rights_t *rights;
738 struct uio *ktruio = NULL;
744 rights = &cap_send_rights;
745 if (mp->msg_name != NULL) {
746 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name);
747 rights = &cap_send_connect_rights;
749 error = getsock_cap(td, s, rights, &fp, NULL, NULL);
754 so = (struct socket *)fp->f_data;
757 if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT))
758 ktrsockaddr(mp->msg_name);
761 if (mp->msg_name != NULL) {
762 error = mac_socket_check_connect(td->td_ucred, so,
769 error = mac_socket_check_send(td->td_ucred, so);
776 auio.uio_iov = mp->msg_iov;
777 auio.uio_iovcnt = mp->msg_iovlen;
778 auio.uio_segflg = segflg;
779 auio.uio_rw = UIO_WRITE;
781 auio.uio_offset = 0; /* XXX */
784 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
785 if ((auio.uio_resid += iov->iov_len) < 0) {
792 if (KTRPOINT(td, KTR_GENIO))
793 ktruio = cloneuio(&auio);
795 len = auio.uio_resid;
796 error = sosend(so, mp->msg_name, &auio, 0, control, flags, td);
798 if (auio.uio_resid != len && (error == ERESTART ||
799 error == EINTR || error == EWOULDBLOCK))
801 /* Generation of SIGPIPE can be controlled per socket */
802 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
803 !(flags & MSG_NOSIGNAL)) {
804 PROC_LOCK(td->td_proc);
805 tdsignal(td, SIGPIPE);
806 PROC_UNLOCK(td->td_proc);
810 td->td_retval[0] = len - auio.uio_resid;
812 if (ktruio != NULL) {
813 ktruio->uio_resid = td->td_retval[0];
814 ktrgenio(s, UIO_WRITE, ktruio, error);
823 sys_sendto(struct thread *td, struct sendto_args *uap)
828 msg.msg_name = uap->to;
829 msg.msg_namelen = uap->tolen;
833 #ifdef COMPAT_OLDSOCK
836 aiov.iov_base = 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 = 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
897 error = sendit(td, uap->s, &msg, uap->flags);
903 kern_recvit(struct thread *td, int s, struct msghdr *mp, enum uio_seg fromseg,
904 struct mbuf **controlp)
908 struct mbuf *control, *m;
912 struct sockaddr *fromsa = NULL;
914 struct uio *ktruio = NULL;
919 if (controlp != NULL)
923 error = getsock_cap(td, s, &cap_recv_rights,
930 error = mac_socket_check_receive(td->td_ucred, so);
937 auio.uio_iov = mp->msg_iov;
938 auio.uio_iovcnt = mp->msg_iovlen;
939 auio.uio_segflg = UIO_USERSPACE;
940 auio.uio_rw = UIO_READ;
942 auio.uio_offset = 0; /* XXX */
945 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
946 if ((auio.uio_resid += iov->iov_len) < 0) {
952 if (KTRPOINT(td, KTR_GENIO))
953 ktruio = cloneuio(&auio);
956 len = auio.uio_resid;
957 error = soreceive(so, &fromsa, &auio, NULL,
958 (mp->msg_control || controlp) ? &control : NULL,
961 if (auio.uio_resid != len && (error == ERESTART ||
962 error == EINTR || error == EWOULDBLOCK))
966 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa);
968 if (ktruio != NULL) {
969 ktruio->uio_resid = len - auio.uio_resid;
970 ktrgenio(s, UIO_READ, ktruio, error);
975 td->td_retval[0] = len - auio.uio_resid;
977 len = mp->msg_namelen;
978 if (len <= 0 || fromsa == NULL)
981 /* save sa_len before it is destroyed by MSG_COMPAT */
982 len = MIN(len, fromsa->sa_len);
983 #ifdef COMPAT_OLDSOCK
984 if (mp->msg_flags & MSG_COMPAT)
985 ((struct osockaddr *)fromsa)->sa_family =
988 if (fromseg == UIO_USERSPACE) {
989 error = copyout(fromsa, mp->msg_name,
994 bcopy(fromsa, mp->msg_name, len);
996 mp->msg_namelen = len;
998 if (mp->msg_control && controlp == NULL) {
999 #ifdef COMPAT_OLDSOCK
1001 * We assume that old recvmsg calls won't receive access
1002 * rights and other control info, esp. as control info
1003 * is always optional and those options didn't exist in 4.3.
1004 * If we receive rights, trim the cmsghdr; anything else
1007 if (control && mp->msg_flags & MSG_COMPAT) {
1008 if (mtod(control, struct cmsghdr *)->cmsg_level !=
1010 mtod(control, struct cmsghdr *)->cmsg_type !=
1012 mp->msg_controllen = 0;
1015 control->m_len -= sizeof (struct cmsghdr);
1016 control->m_data += sizeof (struct cmsghdr);
1019 ctlbuf = mp->msg_control;
1020 len = mp->msg_controllen;
1021 mp->msg_controllen = 0;
1022 for (m = control; m != NULL && len >= m->m_len; m = m->m_next) {
1023 if ((error = copyout(mtod(m, caddr_t), ctlbuf,
1029 mp->msg_controllen += m->m_len;
1032 mp->msg_flags |= MSG_CTRUNC;
1033 m_dispose_extcontrolm(m);
1039 if (fromsa && KTRPOINT(td, KTR_STRUCT))
1040 ktrsockaddr(fromsa);
1042 free(fromsa, M_SONAME);
1044 if (error == 0 && controlp != NULL)
1045 *controlp = control;
1046 else if (control != NULL) {
1048 m_dispose_extcontrolm(control);
1056 recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp)
1060 error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL);
1063 if (namelenp != NULL) {
1064 error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t));
1065 #ifdef COMPAT_OLDSOCK
1066 if (mp->msg_flags & MSG_COMPAT)
1067 error = 0; /* old recvfrom didn't check */
1074 sys_recvfrom(struct thread *td, struct recvfrom_args *uap)
1080 if (uap->fromlenaddr) {
1081 error = copyin(uap->fromlenaddr,
1082 &msg.msg_namelen, sizeof (msg.msg_namelen));
1086 msg.msg_namelen = 0;
1088 msg.msg_name = uap->from;
1089 msg.msg_iov = &aiov;
1091 aiov.iov_base = uap->buf;
1092 aiov.iov_len = uap->len;
1093 msg.msg_control = 0;
1094 msg.msg_flags = uap->flags;
1095 error = recvit(td, uap->s, &msg, uap->fromlenaddr);
1100 #ifdef COMPAT_OLDSOCK
1102 orecvfrom(struct thread *td, struct recvfrom_args *uap)
1105 uap->flags |= MSG_COMPAT;
1106 return (sys_recvfrom(td, uap));
1110 #ifdef COMPAT_OLDSOCK
1112 orecv(struct thread *td, struct orecv_args *uap)
1118 msg.msg_namelen = 0;
1119 msg.msg_iov = &aiov;
1121 aiov.iov_base = uap->buf;
1122 aiov.iov_len = uap->len;
1123 msg.msg_control = 0;
1124 msg.msg_flags = uap->flags;
1125 return (recvit(td, uap->s, &msg, NULL));
1129 * Old recvmsg. This code takes advantage of the fact that the old msghdr
1130 * overlays the new one, missing only the flags, and with the (old) access
1131 * rights where the control fields are now.
1134 orecvmsg(struct thread *td, struct orecvmsg_args *uap)
1140 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
1143 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1146 msg.msg_flags = uap->flags | MSG_COMPAT;
1148 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen);
1149 if (msg.msg_controllen && error == 0)
1150 error = copyout(&msg.msg_controllen,
1151 &uap->msg->msg_accrightslen, sizeof (int));
1158 sys_recvmsg(struct thread *td, struct recvmsg_args *uap)
1161 struct iovec *uiov, *iov;
1164 error = copyin(uap->msg, &msg, sizeof (msg));
1167 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1170 msg.msg_flags = uap->flags;
1171 #ifdef COMPAT_OLDSOCK
1172 msg.msg_flags &= ~MSG_COMPAT;
1176 error = recvit(td, uap->s, &msg, NULL);
1179 error = copyout(&msg, uap->msg, sizeof(msg));
1186 sys_shutdown(struct thread *td, struct shutdown_args *uap)
1189 return (kern_shutdown(td, uap->s, uap->how));
1193 kern_shutdown(struct thread *td, int s, int how)
1200 error = getsock_cap(td, s, &cap_shutdown_rights,
1204 error = soshutdown(so, how);
1206 * Previous versions did not return ENOTCONN, but 0 in
1207 * case the socket was not connected. Some important
1208 * programs like syslogd up to r279016, 2015-02-19,
1209 * still depend on this behavior.
1211 if (error == ENOTCONN &&
1212 td->td_proc->p_osrel < P_OSREL_SHUTDOWN_ENOTCONN)
1220 sys_setsockopt(struct thread *td, struct setsockopt_args *uap)
1223 return (kern_setsockopt(td, uap->s, uap->level, uap->name,
1224 uap->val, UIO_USERSPACE, uap->valsize));
1228 kern_setsockopt(struct thread *td, int s, int level, int name, void *val,
1229 enum uio_seg valseg, socklen_t valsize)
1233 struct sockopt sopt;
1236 if (val == NULL && valsize != 0)
1238 if ((int)valsize < 0)
1241 sopt.sopt_dir = SOPT_SET;
1242 sopt.sopt_level = level;
1243 sopt.sopt_name = name;
1244 sopt.sopt_val = val;
1245 sopt.sopt_valsize = valsize;
1251 sopt.sopt_td = NULL;
1254 panic("kern_setsockopt called with bad valseg");
1258 error = getsock_cap(td, s, &cap_setsockopt_rights,
1262 error = sosetopt(so, &sopt);
1269 sys_getsockopt(struct thread *td, struct getsockopt_args *uap)
1275 error = copyin(uap->avalsize, &valsize, sizeof (valsize));
1280 error = kern_getsockopt(td, uap->s, uap->level, uap->name,
1281 uap->val, UIO_USERSPACE, &valsize);
1284 error = copyout(&valsize, uap->avalsize, sizeof (valsize));
1289 * Kernel version of getsockopt.
1290 * optval can be a userland or userspace. optlen is always a kernel pointer.
1293 kern_getsockopt(struct thread *td, int s, int level, int name, void *val,
1294 enum uio_seg valseg, socklen_t *valsize)
1298 struct sockopt sopt;
1303 if ((int)*valsize < 0)
1306 sopt.sopt_dir = SOPT_GET;
1307 sopt.sopt_level = level;
1308 sopt.sopt_name = name;
1309 sopt.sopt_val = val;
1310 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */
1316 sopt.sopt_td = NULL;
1319 panic("kern_getsockopt called with bad valseg");
1323 error = getsock_cap(td, s, &cap_getsockopt_rights,
1327 error = sogetopt(so, &sopt);
1328 *valsize = sopt.sopt_valsize;
1335 * getsockname1() - Get socket name.
1338 getsockname1(struct thread *td, struct getsockname_args *uap, int compat)
1340 struct sockaddr *sa;
1344 error = copyin(uap->alen, &len, sizeof(len));
1348 error = kern_getsockname(td, uap->fdes, &sa, &len);
1353 #ifdef COMPAT_OLDSOCK
1355 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1357 error = copyout(sa, uap->asa, (u_int)len);
1361 error = copyout(&len, uap->alen, sizeof(len));
1366 kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
1375 error = getsock_cap(td, fd, &cap_getsockname_rights,
1381 CURVNET_SET(so->so_vnet);
1382 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa);
1389 len = MIN(*alen, (*sa)->sa_len);
1392 if (KTRPOINT(td, KTR_STRUCT))
1397 if (error != 0 && *sa != NULL) {
1398 free(*sa, M_SONAME);
1405 sys_getsockname(struct thread *td, struct getsockname_args *uap)
1408 return (getsockname1(td, uap, 0));
1411 #ifdef COMPAT_OLDSOCK
1413 ogetsockname(struct thread *td, struct getsockname_args *uap)
1416 return (getsockname1(td, uap, 1));
1418 #endif /* COMPAT_OLDSOCK */
1421 * getpeername1() - Get name of peer for connected socket.
1424 getpeername1(struct thread *td, struct getpeername_args *uap, int compat)
1426 struct sockaddr *sa;
1430 error = copyin(uap->alen, &len, sizeof (len));
1434 error = kern_getpeername(td, uap->fdes, &sa, &len);
1439 #ifdef COMPAT_OLDSOCK
1441 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1443 error = copyout(sa, uap->asa, (u_int)len);
1447 error = copyout(&len, uap->alen, sizeof(len));
1452 kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
1461 error = getsock_cap(td, fd, &cap_getpeername_rights,
1466 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1471 CURVNET_SET(so->so_vnet);
1472 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa);
1479 len = MIN(*alen, (*sa)->sa_len);
1482 if (KTRPOINT(td, KTR_STRUCT))
1486 if (error != 0 && *sa != NULL) {
1487 free(*sa, M_SONAME);
1496 sys_getpeername(struct thread *td, struct getpeername_args *uap)
1499 return (getpeername1(td, uap, 0));
1502 #ifdef COMPAT_OLDSOCK
1504 ogetpeername(struct thread *td, struct ogetpeername_args *uap)
1507 /* XXX uap should have type `getpeername_args *' to begin with. */
1508 return (getpeername1(td, (struct getpeername_args *)uap, 1));
1510 #endif /* COMPAT_OLDSOCK */
1513 sockargs(struct mbuf **mp, char *buf, socklen_t buflen, int type)
1515 struct sockaddr *sa;
1519 if (buflen > MLEN) {
1520 #ifdef COMPAT_OLDSOCK
1521 if (type == MT_SONAME && buflen <= 112)
1522 buflen = MLEN; /* unix domain compat. hack */
1525 if (buflen > MCLBYTES)
1528 m = m_get2(buflen, M_WAITOK, type, 0);
1530 error = copyin(buf, mtod(m, void *), buflen);
1535 if (type == MT_SONAME) {
1536 sa = mtod(m, struct sockaddr *);
1538 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1539 if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
1540 sa->sa_family = sa->sa_len;
1542 sa->sa_len = buflen;
1549 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len)
1551 struct sockaddr *sa;
1554 if (len > SOCK_MAXADDRLEN)
1555 return (ENAMETOOLONG);
1556 if (len < offsetof(struct sockaddr, sa_data[0]))
1558 sa = malloc(len, M_SONAME, M_WAITOK);
1559 error = copyin(uaddr, sa, len);
1563 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1564 if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
1565 sa->sa_family = sa->sa_len;
1574 * Dispose of externalized rights from an SCM_RIGHTS message. This function
1575 * should be used in error or truncation cases to avoid leaking file descriptors
1576 * into the recipient's (the current thread's) table.
1579 m_dispose_extcontrolm(struct mbuf *m)
1584 socklen_t clen, datalen;
1585 int error, fd, *fds, nfd;
1588 for (; m != NULL; m = m->m_next) {
1589 if (m->m_type != MT_EXTCONTROL)
1591 cm = mtod(m, struct cmsghdr *);
1594 if (clen < sizeof(*cm))
1595 panic("%s: truncated mbuf %p", __func__, m);
1596 datalen = CMSG_SPACE(cm->cmsg_len - CMSG_SPACE(0));
1598 panic("%s: truncated mbuf %p", __func__, m);
1600 if (cm->cmsg_level == SOL_SOCKET &&
1601 cm->cmsg_type == SCM_RIGHTS) {
1602 fds = (int *)CMSG_DATA(cm);
1603 nfd = (cm->cmsg_len - CMSG_SPACE(0)) /
1608 error = fget(td, fd, &cap_no_rights,
1611 fdclose(td, fp, fd);
1615 cm = (struct cmsghdr *)((uint8_t *)cm + datalen);
1617 m_chtype(m, MT_CONTROL);