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NetBSD/sys/kern/uipc_syscalls.c

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/* $NetBSD: uipc_syscalls.c,v 1.117 2007/08/27 20:09:44 dsl Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)uipc_syscalls.c 8.6 (Berkeley) 2/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_syscalls.c,v 1.117 2007/08/27 20:09:44 dsl Exp $");
#include "opt_pipe.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/un.h>
#include <sys/ktrace.h>
#include <sys/event.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <uvm/uvm_extern.h>
/*
* System call interface to the socket abstraction.
*/
extern const struct fileops socketops;
int
sys___socket30(struct lwp *l, void *v, register_t *retval)
{
struct sys___socket30_args /* {
syscallarg(int) domain;
syscallarg(int) type;
syscallarg(int) protocol;
} */ *uap = v;
struct filedesc *fdp;
struct socket *so;
struct file *fp;
int fd, error;
fdp = l->l_proc->p_fd;
/* falloc() will use the desciptor for us */
if ((error = falloc(l, &fp, &fd)) != 0)
return (error);
fp->f_flag = FREAD|FWRITE;
fp->f_type = DTYPE_SOCKET;
fp->f_ops = &socketops;
error = socreate(SCARG(uap, domain), &so, SCARG(uap, type),
SCARG(uap, protocol), l);
if (error) {
FILE_UNUSE(fp, l);
fdremove(fdp, fd);
ffree(fp);
} else {
fp->f_data = so;
FILE_SET_MATURE(fp);
FILE_UNUSE(fp, l);
*retval = fd;
}
return (error);
}
/* ARGSUSED */
int
sys_bind(struct lwp *l, void *v, register_t *retval)
{
struct sys_bind_args /* {
syscallarg(int) s;
syscallarg(const struct sockaddr *) name;
syscallarg(unsigned int) namelen;
} */ *uap = v;
struct mbuf *nam;
int error;
error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen),
MT_SONAME);
if (error)
return error;
return do_sys_bind(l, SCARG(uap, s), nam);
}
int
do_sys_bind(struct lwp *l, int s, struct mbuf *nam)
{
struct file *fp;
int error;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, s, &fp)) != 0) {
m_freem(nam);
return (error);
}
MCLAIM(nam, ((struct socket *)fp->f_data)->so_mowner);
error = sobind(fp->f_data, nam, l);
m_freem(nam);
FILE_UNUSE(fp, l);
return error;
}
/* ARGSUSED */
int
sys_listen(struct lwp *l, void *v, register_t *retval)
{
struct sys_listen_args /* {
syscallarg(int) s;
syscallarg(int) backlog;
} */ *uap = v;
struct file *fp;
int error;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, SCARG(uap, s), &fp)) != 0)
return (error);
error = solisten(fp->f_data, SCARG(uap, backlog));
FILE_UNUSE(fp, l);
return error;
}
int
do_sys_accept(struct lwp *l, int sock, struct mbuf **name, register_t *new_sock)
{
struct filedesc *fdp;
struct file *fp;
struct mbuf *nam;
int error, s, fd;
struct socket *so;
int fflag;
fdp = l->l_proc->p_fd;
/* getsock() will use the descriptor for us */
if ((error = getsock(fdp, sock, &fp)) != 0)
return (error);
s = splsoftnet();
so = (struct socket *)fp->f_data;
FILE_UNUSE(fp, l);
if (!(so->so_proto->pr_flags & PR_LISTEN)) {
splx(s);
return (EOPNOTSUPP);
}
if ((so->so_options & SO_ACCEPTCONN) == 0) {
splx(s);
return (EINVAL);
}
if ((so->so_state & SS_NBIO) && so->so_qlen == 0) {
splx(s);
return (EWOULDBLOCK);
}
while (so->so_qlen == 0 && so->so_error == 0) {
if (so->so_state & SS_CANTRCVMORE) {
so->so_error = ECONNABORTED;
break;
}
error = tsleep(&so->so_timeo, PSOCK | PCATCH,
netcon, 0);
if (error) {
splx(s);
return (error);
}
}
if (so->so_error) {
error = so->so_error;
so->so_error = 0;
splx(s);
return (error);
}
fflag = fp->f_flag;
/* falloc() will use the descriptor for us */
if ((error = falloc(l, &fp, &fd)) != 0) {
splx(s);
return (error);
}
*new_sock = fd;
/* connection has been removed from the listen queue */
KNOTE(&so->so_rcv.sb_sel.sel_klist, 0);
{ struct socket *aso = TAILQ_FIRST(&so->so_q);
if (soqremque(aso, 1) == 0)
panic("accept");
so = aso;
}
fp->f_type = DTYPE_SOCKET;
fp->f_flag = fflag;
fp->f_ops = &socketops;
fp->f_data = so;
nam = m_get(M_WAIT, MT_SONAME);
error = soaccept(so, nam);
if (error) {
/* an error occurred, free the file descriptor and mbuf */
m_freem(nam);
fdremove(fdp, fd);
closef(fp, l);
} else {
FILE_SET_MATURE(fp);
FILE_UNUSE(fp, l);
*name = nam;
}
splx(s);
return (error);
}
int
sys_accept(struct lwp *l, void *v, register_t *retval)
{
struct sys_accept_args /* {
syscallarg(int) s;
syscallarg(struct sockaddr *) name;
syscallarg(unsigned int *) anamelen;
} */ *uap = v;
int error;
struct mbuf *name;
error = do_sys_accept(l, SCARG(uap, s), &name, retval);
if (error != 0)
return error;
error = copyout_sockname(SCARG(uap, name), SCARG(uap, anamelen),
MSG_LENUSRSPACE, name);
if (name != NULL)
m_free(name);
if (error != 0)
fdrelease(l, *retval);
return error;
}
/* ARGSUSED */
int
sys_connect(struct lwp *l, void *v, register_t *retval)
{
struct sys_connect_args /* {
syscallarg(int) s;
syscallarg(const struct sockaddr *) name;
syscallarg(unsigned int) namelen;
} */ *uap = v;
int error;
struct mbuf *nam;
error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen),
MT_SONAME);
if (error)
return error;
return do_sys_connect(l, SCARG(uap, s), nam);
}
int
do_sys_connect(struct lwp *l, int s, struct mbuf *nam)
{
struct file *fp;
struct socket *so;
int error;
int interrupted = 0;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, s, &fp)) != 0) {
m_freem(nam);
return (error);
}
so = fp->f_data;
MCLAIM(nam, so->so_mowner);
if (so->so_state & SS_ISCONNECTING) {
error = EALREADY;
goto out;
}
error = soconnect(so, nam, l);
if (error)
goto bad;
if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
error = EINPROGRESS;
goto out;
}
s = splsoftnet();
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
error = tsleep(&so->so_timeo, PSOCK | PCATCH,
netcon, 0);
if (error) {
if (error == EINTR || error == ERESTART)
interrupted = 1;
break;
}
}
if (error == 0) {
error = so->so_error;
so->so_error = 0;
}
splx(s);
bad:
if (!interrupted)
so->so_state &= ~SS_ISCONNECTING;
if (error == ERESTART)
error = EINTR;
out:
FILE_UNUSE(fp, l);
m_freem(nam);
return (error);
}
int
sys_socketpair(struct lwp *l, void *v, register_t *retval)
{
struct sys_socketpair_args /* {
syscallarg(int) domain;
syscallarg(int) type;
syscallarg(int) protocol;
syscallarg(int *) rsv;
} */ *uap = v;
struct filedesc *fdp;
struct file *fp1, *fp2;
struct socket *so1, *so2;
int fd, error, sv[2];
fdp = l->l_proc->p_fd;
error = socreate(SCARG(uap, domain), &so1, SCARG(uap, type),
SCARG(uap, protocol), l);
if (error)
return (error);
error = socreate(SCARG(uap, domain), &so2, SCARG(uap, type),
SCARG(uap, protocol), l);
if (error)
goto free1;
/* falloc() will use the descriptor for us */
if ((error = falloc(l, &fp1, &fd)) != 0)
goto free2;
sv[0] = fd;
fp1->f_flag = FREAD|FWRITE;
fp1->f_type = DTYPE_SOCKET;
fp1->f_ops = &socketops;
fp1->f_data = so1;
if ((error = falloc(l, &fp2, &fd)) != 0)
goto free3;
fp2->f_flag = FREAD|FWRITE;
fp2->f_type = DTYPE_SOCKET;
fp2->f_ops = &socketops;
fp2->f_data = so2;
sv[1] = fd;
if ((error = soconnect2(so1, so2)) != 0)
goto free4;
if (SCARG(uap, type) == SOCK_DGRAM) {
/*
* Datagram socket connection is asymmetric.
*/
if ((error = soconnect2(so2, so1)) != 0)
goto free4;
}
error = copyout(sv, SCARG(uap, rsv), 2 * sizeof(int));
FILE_SET_MATURE(fp1);
FILE_SET_MATURE(fp2);
FILE_UNUSE(fp1, l);
FILE_UNUSE(fp2, l);
return (error);
free4:
FILE_UNUSE(fp2, l);
ffree(fp2);
fdremove(fdp, sv[1]);
free3:
FILE_UNUSE(fp1, l);
ffree(fp1);
fdremove(fdp, sv[0]);
free2:
(void)soclose(so2);
free1:
(void)soclose(so1);
return (error);
}
int
sys_sendto(struct lwp *l, void *v, register_t *retval)
{
struct sys_sendto_args /* {
syscallarg(int) s;
syscallarg(const void *) buf;
syscallarg(size_t) len;
syscallarg(int) flags;
syscallarg(const struct sockaddr *) to;
syscallarg(unsigned int) tolen;
} */ *uap = v;
struct msghdr msg;
struct iovec aiov;
msg.msg_name = __UNCONST(SCARG(uap, to)); /* XXXUNCONST kills const */
msg.msg_namelen = SCARG(uap, tolen);
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
msg.msg_control = 0;
msg.msg_flags = 0;
aiov.iov_base = __UNCONST(SCARG(uap, buf)); /* XXXUNCONST kills const */
aiov.iov_len = SCARG(uap, len);
return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
}
int
sys_sendmsg(struct lwp *l, void *v, register_t *retval)
{
struct sys_sendmsg_args /* {
syscallarg(int) s;
syscallarg(const struct msghdr *) msg;
syscallarg(int) flags;
} */ *uap = v;
struct msghdr msg;
int error;
error = copyin(SCARG(uap, msg), &msg, sizeof(msg));
if (error)
return (error);
msg.msg_flags = MSG_IOVUSRSPACE;
return do_sys_sendmsg(l, SCARG(uap, s), &msg, SCARG(uap, flags), retval);
}
int
do_sys_sendmsg(struct lwp *l, int s, struct msghdr *mp, int flags,
register_t *retsize)
{
struct file *fp;
struct uio auio;
int i, len, error, iovlen;
struct mbuf *to, *control;
struct socket *so;
struct iovec *tiov;
struct iovec aiov[UIO_SMALLIOV], *iov = aiov;
struct iovec *ktriov;
ktrkuser("msghdr", mp, sizeof *mp);
/* If the caller passed us stuff in mbufs, we must free them */
if (mp->msg_flags & MSG_NAMEMBUF)
to = mp->msg_name;
else
to = NULL;
if (mp->msg_flags & MSG_CONTROLMBUF)
control = mp->msg_control;
else
control = NULL;
if (mp->msg_flags & MSG_IOVUSRSPACE) {
if ((unsigned int)mp->msg_iovlen > UIO_SMALLIOV) {
if ((unsigned int)mp->msg_iovlen > IOV_MAX) {
error = EMSGSIZE;
goto bad;
}
iov = malloc(sizeof(struct iovec) * mp->msg_iovlen,
M_IOV, M_WAITOK);
}
if (mp->msg_iovlen != 0) {
error = copyin(mp->msg_iov, iov,
(size_t)(mp->msg_iovlen * sizeof(struct iovec)));
if (error)
goto bad;
}
mp->msg_iov = iov;
}
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_rw = UIO_WRITE;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
KASSERT(l == curlwp);
auio.uio_vmspace = l->l_proc->p_vmspace;
for (i = 0, tiov = mp->msg_iov; i < mp->msg_iovlen; i++, tiov++) {
#if 0
/* cannot happen; iov_len is unsigned */
if (tiov->iov_len < 0) {
error = EINVAL;
goto bad;
}
#endif
/*
* Writes return ssize_t because -1 is returned on error.
* Therefore, we must restrict the length to SSIZE_MAX to
* avoid garbage return values.
*/
auio.uio_resid += tiov->iov_len;
if (tiov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) {
error = EINVAL;
goto bad;
}
}
if (mp->msg_name && to == NULL) {
error = sockargs(&to, mp->msg_name, mp->msg_namelen,
MT_SONAME);
if (error)
goto bad;
}
if (mp->msg_control) {
if (mp->msg_controllen < CMSG_ALIGN(sizeof(struct cmsghdr))) {
error = EINVAL;
goto bad;
}
if (control == NULL) {
error = sockargs(&control, mp->msg_control,
mp->msg_controllen, MT_CONTROL);
if (error)
goto bad;
}
}
ktriov = NULL;
if (ktrpoint(KTR_GENIO)) {
iovlen = auio.uio_iovcnt * sizeof(struct iovec);
ktriov = malloc(iovlen, M_TEMP, M_WAITOK);
memcpy(ktriov, auio.uio_iov, iovlen);
}
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, s, &fp)) != 0)
goto bad;
so = (struct socket *)fp->f_data;
if (mp->msg_name)
MCLAIM(to, so->so_mowner);
if (mp->msg_control)
MCLAIM(control, so->so_mowner);
len = auio.uio_resid;
error = (*so->so_send)(so, to, &auio, NULL, control, flags, l);
/* Protocol is responsible for freeing 'control' */
control = NULL;
FILE_UNUSE(fp, l);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
if (error == EPIPE && (flags & MSG_NOSIGNAL) == 0) {
mutex_enter(&proclist_mutex);
psignal(l->l_proc, SIGPIPE);
mutex_exit(&proclist_mutex);
}
}
if (error == 0)
*retsize = len - auio.uio_resid;
if (ktriov != NULL) {
ktrgeniov(s, UIO_WRITE, ktriov, *retsize, error);
free(ktriov, M_TEMP);
}
bad:
if (iov != aiov)
free(iov, M_IOV);
if (to)
m_freem(to);
if (control != NULL)
m_freem(control);
return (error);
}
int
sys_recvfrom(struct lwp *l, void *v, register_t *retval)
{
struct sys_recvfrom_args /* {
syscallarg(int) s;
syscallarg(void *) buf;
syscallarg(size_t) len;
syscallarg(int) flags;
syscallarg(struct sockaddr *) from;
syscallarg(unsigned int *) fromlenaddr;
} */ *uap = v;
struct msghdr msg;
struct iovec aiov;
int error;
struct mbuf *from;
msg.msg_name = NULL;;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, len);
msg.msg_control = NULL;
msg.msg_flags = SCARG(uap, flags) & MSG_USERFLAGS;
error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, NULL, retval);
if (error != 0)
return error;
error = copyout_sockname(SCARG(uap, from), SCARG(uap, fromlenaddr),
MSG_LENUSRSPACE, from);
if (from != NULL)
m_free(from);
return error;
}
int
sys_recvmsg(struct lwp *l, void *v, register_t *retval)
{
struct sys_recvmsg_args /* {
syscallarg(int) s;
syscallarg(struct msghdr *) msg;
syscallarg(int) flags;
} */ *uap = v;
struct msghdr msg;
int error;
struct mbuf *from, *control;
error = copyin(SCARG(uap, msg), &msg, sizeof(msg));
if (error)
return (error);
msg.msg_flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE;
error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from,
msg.msg_control != NULL ? &control : NULL, retval);
if (error != 0)
return error;
if (msg.msg_control != NULL)
error = copyout_msg_control(l, &msg, control);
if (error == 0)
error = copyout_sockname(msg.msg_name, &msg.msg_namelen, 0,
from);
if (from != NULL)
m_free(from);
if (error == 0) {
ktrkuser("msghdr", &msg, sizeof msg);
error = copyout(&msg, SCARG(uap, msg), sizeof(msg));
}
return (error);
}
/*
* Adjust for a truncated SCM_RIGHTS control message.
* This means closing any file descriptors that aren't present
* in the returned buffer.
* m is the mbuf holding the (already externalized) SCM_RIGHTS message.
*/
static void
free_rights(struct mbuf *m, struct lwp *l)
{
int nfd;
int i;
int *fdv;
nfd = m->m_len < CMSG_SPACE(sizeof(int)) ? 0
: (m->m_len - CMSG_SPACE(sizeof(int))) / sizeof(int) + 1;
fdv = (int *) CMSG_DATA(mtod(m,struct cmsghdr *));
for (i = 0; i < nfd; i++)
fdrelease(l, fdv[i]);
}
void
free_control_mbuf(struct lwp *l, struct mbuf *control, struct mbuf *uncopied)
{
struct mbuf *next;
struct cmsghdr *cmsg;
bool do_free_rights = false;
while (control != NULL) {
cmsg = mtod(control, struct cmsghdr *);
if (control == uncopied)
do_free_rights = true;
if (do_free_rights && cmsg->cmsg_level == SOL_SOCKET
&& cmsg->cmsg_type == SCM_RIGHTS)
free_rights(control, l);
next = control->m_next;
m_free(control);
control = next;
}
}
/* Copy socket control/CMSG data to user buffer, frees the mbuf */
int
copyout_msg_control(struct lwp *l, struct msghdr *mp, struct mbuf *control)
{
int i, len, error = 0;
struct cmsghdr *cmsg;
struct mbuf *m;
char *q;
len = mp->msg_controllen;
if (len <= 0 || control == 0) {
mp->msg_controllen = 0;
free_control_mbuf(l, control, control);
return 0;
}
q = (char *)mp->msg_control;
for (m = control; m != NULL; ) {
cmsg = mtod(m, struct cmsghdr *);
i = m->m_len;
if (len < i) {
mp->msg_flags |= MSG_CTRUNC;
if (cmsg->cmsg_level == SOL_SOCKET
&& cmsg->cmsg_type == SCM_RIGHTS)
/* Do not truncate me ... */
break;
i = len;
}
error = copyout(mtod(m, void *), q, i);
ktrkuser("msgcontrol", mtod(m, void *), i);
if (error != 0) {
/* We must free all the SCM_RIGHTS */
m = control;
break;
}
m = m->m_next;
if (m)
i = ALIGN(i);
q += i;
len -= i;
if (len <= 0)
break;
}
free_control_mbuf(l, control, m);
mp->msg_controllen = q - (char *)mp->msg_control;
return error;
}
int
do_sys_recvmsg(struct lwp *l, int s, struct msghdr *mp, struct mbuf **from,
struct mbuf **control, register_t *retsize)
{
struct file *fp;
struct uio auio;
struct iovec aiov[UIO_SMALLIOV], *iov = aiov;
struct iovec *tiov;
int i, len, error, iovlen;
struct socket *so;
struct iovec *ktriov;
ktrkuser("msghdr", mp, sizeof *mp);
*from = NULL;
if (control != NULL)
*control = NULL;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, s, &fp)) != 0)
return (error);
so = (struct socket *)fp->f_data;
if (mp->msg_flags & MSG_IOVUSRSPACE) {
if ((unsigned int)mp->msg_iovlen > UIO_SMALLIOV) {
if ((unsigned int)mp->msg_iovlen > IOV_MAX) {
error = EMSGSIZE;
goto out;
}
iov = malloc(sizeof(struct iovec) * mp->msg_iovlen,
M_IOV, M_WAITOK);
}
if (mp->msg_iovlen != 0) {
error = copyin(mp->msg_iov, iov,
(size_t)(mp->msg_iovlen * sizeof(struct iovec)));
if (error)
goto out;
}
auio.uio_iov = iov;
} else
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_rw = UIO_READ;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
KASSERT(l == curlwp);
auio.uio_vmspace = l->l_proc->p_vmspace;
tiov = auio.uio_iov;
for (i = 0; i < mp->msg_iovlen; i++, tiov++) {
#if 0
/* cannot happen iov_len is unsigned */
if (tiov->iov_len < 0) {
error = EINVAL;
goto out;
}
#endif
/*
* Reads return ssize_t because -1 is returned on error.
* Therefore we must restrict the length to SSIZE_MAX to
* avoid garbage return values.
*/
auio.uio_resid += tiov->iov_len;
if (tiov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) {
error = EINVAL;
goto out;
}
}
ktriov = NULL;
if (ktrpoint(KTR_GENIO)) {
iovlen = auio.uio_iovcnt * sizeof(struct iovec);
ktriov = malloc(iovlen, M_TEMP, M_WAITOK);
memcpy(ktriov, auio.uio_iov, iovlen);
}
len = auio.uio_resid;
mp->msg_flags &= MSG_USERFLAGS;
error = (*so->so_receive)(so, from, &auio, NULL, control,
&mp->msg_flags);
len -= auio.uio_resid;
*retsize = len;
if (error != 0 && len != 0
&& (error == ERESTART || error == EINTR || error == EWOULDBLOCK))
/* Some data transferred */
error = 0;
if (ktriov != NULL) {
ktrgeniov(s, UIO_READ, ktriov, len, error);
free(ktriov, M_TEMP);
}
if (error != 0) {
m_freem(*from);
*from = NULL;
if (control != NULL) {
free_control_mbuf(l, *control, *control);
*control = NULL;
}
}
out:
if (iov != aiov)
free(iov, M_TEMP);
FILE_UNUSE(fp, l);
return (error);
}
/* ARGSUSED */
int
sys_shutdown(struct lwp *l, void *v, register_t *retval)
{
struct sys_shutdown_args /* {
syscallarg(int) s;
syscallarg(int) how;
} */ *uap = v;
struct proc *p;
struct file *fp;
int error;
p = l->l_proc;
/* getsock() will use the descriptor for us */
if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0)
return (error);
error = soshutdown((struct socket *)fp->f_data, SCARG(uap, how));
FILE_UNUSE(fp, l);
return (error);
}
/* ARGSUSED */
int
sys_setsockopt(struct lwp *l, void *v, register_t *retval)
{
struct sys_setsockopt_args /* {
syscallarg(int) s;
syscallarg(int) level;
syscallarg(int) name;
syscallarg(const void *) val;
syscallarg(unsigned int) valsize;
} */ *uap = v;
struct proc *p;
struct file *fp;
struct mbuf *m;
struct socket *so;
int error;
unsigned int len;
p = l->l_proc;
m = NULL;
/* getsock() will use the descriptor for us */
if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0)
return (error);
so = (struct socket *)fp->f_data;
len = SCARG(uap, valsize);
if (len > MCLBYTES) {
error = EINVAL;
goto out;
}
if (SCARG(uap, val)) {
m = m_get(M_WAIT, MT_SOOPTS);
MCLAIM(m, so->so_mowner);
if (len > MLEN)
m_clget(m, M_WAIT);
error = copyin(SCARG(uap, val), mtod(m, void *), len);
if (error) {
(void) m_free(m);
goto out;
}
m->m_len = SCARG(uap, valsize);
}
error = sosetopt(so, SCARG(uap, level), SCARG(uap, name), m);
out:
FILE_UNUSE(fp, l);
return (error);
}
/* ARGSUSED */
int
sys_getsockopt(struct lwp *l, void *v, register_t *retval)
{
struct sys_getsockopt_args /* {
syscallarg(int) s;
syscallarg(int) level;
syscallarg(int) name;
syscallarg(void *) val;
syscallarg(unsigned int *) avalsize;
} */ *uap = v;
struct file *fp;
struct mbuf *m;
unsigned int op, i, valsize;
int error;
m = NULL;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, SCARG(uap, s), &fp)) != 0)
return (error);
if (SCARG(uap, val)) {
error = copyin(SCARG(uap, avalsize),
&valsize, sizeof(valsize));
if (error)
goto out;
} else
valsize = 0;
if ((error = sogetopt((struct socket *)fp->f_data, SCARG(uap, level),
SCARG(uap, name), &m)) == 0 && SCARG(uap, val) && valsize &&
m != NULL) {
op = 0;
while (m && !error && op < valsize) {
i = min(m->m_len, (valsize - op));
error = copyout(mtod(m, void *), SCARG(uap, val), i);
op += i;
SCARG(uap, val) = ((uint8_t *)SCARG(uap, val)) + i;
m = m_free(m);
}
valsize = op;
if (error == 0)
error = copyout(&valsize,
SCARG(uap, avalsize), sizeof(valsize));
}
if (m != NULL)
(void) m_freem(m);
out:
FILE_UNUSE(fp, l);
return (error);
}
#ifdef PIPE_SOCKETPAIR
/* ARGSUSED */
int
sys_pipe(struct lwp *l, void *v, register_t *retval)
{
struct filedesc *fdp;
struct file *rf, *wf;
struct socket *rso, *wso;
int fd, error;
fdp = l->l_proc->p_fd;
if ((error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, l)) != 0)
return (error);
if ((error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, l)) != 0)
goto free1;
/* remember this socket pair implements a pipe */
wso->so_state |= SS_ISAPIPE;
rso->so_state |= SS_ISAPIPE;
/* falloc() will use the descriptor for us */
if ((error = falloc(l, &rf, &fd)) != 0)
goto free2;
retval[0] = fd;
rf->f_flag = FREAD;
rf->f_type = DTYPE_SOCKET;
rf->f_ops = &socketops;
rf->f_data = rso;
if ((error = falloc(l, &wf, &fd)) != 0)
goto free3;
wf->f_flag = FWRITE;
wf->f_type = DTYPE_SOCKET;
wf->f_ops = &socketops;
wf->f_data = wso;
retval[1] = fd;
if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0)
goto free4;
FILE_SET_MATURE(rf);
FILE_SET_MATURE(wf);
FILE_UNUSE(rf, l);
FILE_UNUSE(wf, l);
return (0);
free4:
FILE_UNUSE(wf, l);
ffree(wf);
fdremove(fdp, retval[1]);
free3:
FILE_UNUSE(rf, l);
ffree(rf);
fdremove(fdp, retval[0]);
free2:
(void)soclose(wso);
free1:
(void)soclose(rso);
return (error);
}
#endif /* PIPE_SOCKETPAIR */
/*
* Get socket name.
*/
/* ARGSUSED */
int
do_sys_getsockname(struct lwp *l, int fd, int which, struct mbuf **nam)
{
struct file *fp;
struct socket *so;
struct mbuf *m;
int error;
/* getsock() will use the descriptor for us */
if ((error = getsock(l->l_proc->p_fd, fd, &fp)) != 0)
return error;
so = (struct socket *)fp->f_data;
if (which == PRU_PEERADDR
&& (so->so_state & (SS_ISCONNECTED | SS_ISCONFIRMING)) == 0) {
error = ENOTCONN;
goto bad;
}
m = m_getclr(M_WAIT, MT_SONAME);
*nam = m;
MCLAIM(m, so->so_mowner);
error = (*so->so_proto->pr_usrreq)(so, which, (struct mbuf *)0,
m, (struct mbuf *)0, (struct lwp *)0);
if (error != 0)
m_free(m);
bad:
FILE_UNUSE(fp, l);
return error;
}
int
copyout_sockname(struct sockaddr *asa, unsigned int *alen, int flags,
struct mbuf *addr)
{
int len;
int error;
if (asa == NULL)
/* Assume application not interested */
return 0;
if (flags & MSG_LENUSRSPACE) {
error = copyin(alen, &len, sizeof(len));
if (error)
return error;
} else
len = *alen;
if (len <= 0)
return EINVAL;
if (addr == NULL) {
len = 0;
error = 0;
} else {
if (len > addr->m_len)
len = addr->m_len;
/* Maybe this ought to copy a chain ? */
ktrkuser("sockname", mtod(addr, void *), len);
error = copyout(mtod(addr, void *), asa, len);
}
if (error == 0) {
if (flags & MSG_LENUSRSPACE)
error = copyout(&len, alen, sizeof(len));
else
*alen = len;
}
return error;
}
/*
* Get socket name.
*/
/* ARGSUSED */
int
sys_getsockname(struct lwp *l, void *v, register_t *retval)
{
struct sys_getsockname_args /* {
syscallarg(int) fdes;
syscallarg(struct sockaddr *) asa;
syscallarg(unsigned int *) alen;
} */ *uap = v;
struct mbuf *m;
int error;
error = do_sys_getsockname(l, SCARG(uap, fdes), PRU_SOCKADDR, &m);
if (error != 0)
return error;
error = copyout_sockname(SCARG(uap, asa), SCARG(uap, alen),
MSG_LENUSRSPACE, m);
if (m != NULL)
m_free(m);
return error;
}
/*
* Get name of peer for connected socket.
*/
/* ARGSUSED */
int
sys_getpeername(struct lwp *l, void *v, register_t *retval)
{
struct sys_getpeername_args /* {
syscallarg(int) fdes;
syscallarg(struct sockaddr *) asa;
syscallarg(unsigned int *) alen;
} */ *uap = v;
struct mbuf *m;
int error;
error = do_sys_getsockname(l, SCARG(uap, fdes), PRU_PEERADDR, &m);
if (error != 0)
return error;
error = copyout_sockname(SCARG(uap, asa), SCARG(uap, alen),
MSG_LENUSRSPACE, m);
if (m != NULL)
m_free(m);
return error;
}
/*
* XXX In a perfect world, we wouldn't pass around socket control
* XXX arguments in mbufs, and this could go away.
*/
int
sockargs(struct mbuf **mp, const void *bf, size_t buflen, int type)
{
struct sockaddr *sa;
struct mbuf *m;
int error;
/*
* We can't allow socket names > UCHAR_MAX in length, since that
* will overflow sa_len. Control data more than a page size in
* length is just too much.
*/
if (buflen > (type == MT_SONAME ? UCHAR_MAX : PAGE_SIZE))
return (EINVAL);
/* Allocate an mbuf to hold the arguments. */
m = m_get(M_WAIT, type);
/* can't claim. don't who to assign it to. */
if (buflen > MLEN) {
/*
* Won't fit into a regular mbuf, so we allocate just
* enough external storage to hold the argument.
*/
MEXTMALLOC(m, buflen, M_WAITOK);
}
m->m_len = buflen;
error = copyin(bf, mtod(m, void *), buflen);
if (error) {
(void) m_free(m);
return (error);
}
ktrkuser("sockargs", mtod(m, void *), buflen);
*mp = m;
if (type == MT_SONAME) {
sa = mtod(m, struct sockaddr *);
#if BYTE_ORDER != BIG_ENDIAN
/*
* 4.3BSD compat thing - need to stay, since bind(2),
* connect(2), sendto(2) were not versioned for COMPAT_43.
*/
if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
sa->sa_family = sa->sa_len;
#endif
sa->sa_len = buflen;
}
return (0);
}
int
getsock(struct filedesc *fdp, int fdes, struct file **fpp)
{
struct file *fp;
if ((fp = fd_getfile(fdp, fdes)) == NULL)
return (EBADF);
FILE_USE(fp);
if (fp->f_type != DTYPE_SOCKET) {
FILE_UNUSE(fp, NULL);
return (ENOTSOCK);
}
*fpp = fp;
return (0);
}
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