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c427816562
freebsd-skq/sys/kern/uipc_syscalls.c
andre 855a36d5a0 In kern_sendfile() fix the calculation of sbytes (the total number of bytes 
written to the socket).  The rewrite in revision 1.240 got confused by the
FreeBSD 4.x bug compatibility code.

For some reason lighttpd, that was used for testing the new sendfile code,
was not affected by the problem but apache and others using headers/trailers
in the sendfile call received incorrect sbytes values after return from non-
blocking sockets.  This then lead to restarts with wrong offsets and thus
mixed up file contents when the socket was writeable again.  All programs
not using headers/trailers, like ftpd, were not affected by the bug.

Reported by:	Pawel Worach <pawel.worach-at-gmail.com>
Tested by:	Pawel Worach <pawel.worach-at-gmail.com>
2006-11-12 20:57:00 +00:00

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/*-
* Copyright (c) 1982, 1986, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* sendfile(2) and related extensions:
* Copyright (c) 1998, David Greenman. 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.
* 4. 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 8.4 (Berkeley) 2/21/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_sctp.h"
#include "opt_compat.h"
#include "opt_ktrace.h"
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/malloc.h>
#include <sys/filedesc.h>
#include <sys/event.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filio.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/sf_buf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
#ifdef SCTP
#include <netinet/sctp.h>
#include <netinet/sctp_peeloff.h>
#endif /* SCTP */
static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
static int accept1(struct thread *td, struct accept_args *uap, int compat);
static int do_sendfile(struct thread *td, struct sendfile_args *uap, int compat);
static int getsockname1(struct thread *td, struct getsockname_args *uap,
int compat);
static int getpeername1(struct thread *td, struct getpeername_args *uap,
int compat);
/*
* NSFBUFS-related variables and associated sysctls
*/
int nsfbufs;
int nsfbufspeak;
int nsfbufsused;
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufs, CTLFLAG_RDTUN, &nsfbufs, 0,
"Maximum number of sendfile(2) sf_bufs available");
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufspeak, CTLFLAG_RD, &nsfbufspeak, 0,
"Number of sendfile(2) sf_bufs at peak usage");
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufsused, CTLFLAG_RD, &nsfbufsused, 0,
"Number of sendfile(2) sf_bufs in use");
/*
* Convert a user file descriptor to a kernel file entry. A reference on the
* file entry is held upon returning. This is lighter weight than
* fgetsock(), which bumps the socket reference drops the file reference
* count instead, as this approach avoids several additional mutex operations
* associated with the additional reference count. If requested, return the
* open file flags.
*/
static int
getsock(struct filedesc *fdp, int fd, struct file **fpp, u_int *fflagp)
{
struct file *fp;
int error;
fp = NULL;
if (fdp == NULL)
error = EBADF;
else {
FILEDESC_LOCK_FAST(fdp);
fp = fget_locked(fdp, fd);
if (fp == NULL)
error = EBADF;
else if (fp->f_type != DTYPE_SOCKET) {
fp = NULL;
error = ENOTSOCK;
} else {
fhold(fp);
if (fflagp != NULL)
*fflagp = fp->f_flag;
error = 0;
}
FILEDESC_UNLOCK_FAST(fdp);
}
*fpp = fp;
return (error);
}
/*
* System call interface to the socket abstraction.
*/
#if defined(COMPAT_43)
#define COMPAT_OLDSOCK
#endif
/*
* MPSAFE
*/
int
socket(td, uap)
struct thread *td;
register struct socket_args /* {
int domain;
int type;
int protocol;
} */ *uap;
{
struct filedesc *fdp;
struct socket *so;
struct file *fp;
int fd, error;
#ifdef MAC
error = mac_check_socket_create(td->td_ucred, uap->domain, uap->type,
uap->protocol);
if (error)
return (error);
#endif
fdp = td->td_proc->p_fd;
error = falloc(td, &fp, &fd);
if (error)
return (error);
/* An extra reference on `fp' has been held for us by falloc(). */
NET_LOCK_GIANT();
error = socreate(uap->domain, &so, uap->type, uap->protocol,
td->td_ucred, td);
NET_UNLOCK_GIANT();
if (error) {
fdclose(fdp, fp, fd, td);
} else {
FILEDESC_LOCK_FAST(fdp);
fp->f_data = so; /* already has ref count */
fp->f_flag = FREAD|FWRITE;
fp->f_ops = &socketops;
fp->f_type = DTYPE_SOCKET;
FILEDESC_UNLOCK_FAST(fdp);
td->td_retval[0] = fd;
}
fdrop(fp, td);
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
bind(td, uap)
struct thread *td;
register struct bind_args /* {
int s;
caddr_t name;
int namelen;
} */ *uap;
{
struct sockaddr *sa;
int error;
if ((error = getsockaddr(&sa, uap->name, uap->namelen)) != 0)
return (error);
error = kern_bind(td, uap->s, sa);
free(sa, M_SONAME);
return (error);
}
int
kern_bind(td, fd, sa)
struct thread *td;
int fd;
struct sockaddr *sa;
{
struct socket *so;
struct file *fp;
int error;
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, fd, &fp, NULL);
if (error)
goto done2;
so = fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_bind(td->td_ucred, so, sa);
SOCK_UNLOCK(so);
if (error)
goto done1;
#endif
error = sobind(so, sa, td);
#ifdef MAC
done1:
#endif
fdrop(fp, td);
done2:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
listen(td, uap)
struct thread *td;
register struct listen_args /* {
int s;
int backlog;
} */ *uap;
{
struct socket *so;
struct file *fp;
int error;
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, uap->s, &fp, NULL);
if (error == 0) {
so = fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_listen(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error)
goto done;
#endif
error = solisten(so, uap->backlog, td);
#ifdef MAC
done:
#endif
fdrop(fp, td);
}
NET_UNLOCK_GIANT();
return(error);
}
/*
* accept1()
* MPSAFE
*/
static int
accept1(td, uap, compat)
struct thread *td;
register struct accept_args /* {
int s;
struct sockaddr * __restrict name;
socklen_t * __restrict anamelen;
} */ *uap;
int compat;
{
struct sockaddr *name;
socklen_t namelen;
struct file *fp;
int error;
if (uap->name == NULL)
return (kern_accept(td, uap->s, NULL, NULL, NULL));
error = copyin(uap->anamelen, &namelen, sizeof (namelen));
if (error)
return (error);
error = kern_accept(td, uap->s, &name, &namelen, &fp);
/*
* return a namelen of zero for older code which might
* ignore the return value from accept.
*/
if (error) {
(void) copyout(&namelen,
uap->anamelen, sizeof(*uap->anamelen));
return (error);
}
if (error == 0 && name != NULL) {
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)name)->sa_family =
name->sa_family;
#endif
error = copyout(name, uap->name, namelen);
}
if (error == 0)
error = copyout(&namelen, uap->anamelen,
sizeof(namelen));
if (error)
fdclose(td->td_proc->p_fd, fp, td->td_retval[0], td);
fdrop(fp, td);
free(name, M_SONAME);
return (error);
}
int
kern_accept(struct thread *td, int s, struct sockaddr **name,
socklen_t *namelen, struct file **fp)
{
struct filedesc *fdp;
struct file *headfp, *nfp = NULL;
struct sockaddr *sa = NULL;
int error;
struct socket *head, *so;
int fd;
u_int fflag;
pid_t pgid;
int tmp;
if (name) {
*name = NULL;
if (*namelen < 0)
return (EINVAL);
}
fdp = td->td_proc->p_fd;
NET_LOCK_GIANT();
error = getsock(fdp, s, &headfp, &fflag);
if (error)
goto done2;
head = headfp->f_data;
if ((head->so_options & SO_ACCEPTCONN) == 0) {
error = EINVAL;
goto done;
}
#ifdef MAC
SOCK_LOCK(head);
error = mac_check_socket_accept(td->td_ucred, head);
SOCK_UNLOCK(head);
if (error != 0)
goto done;
#endif
error = falloc(td, &nfp, &fd);
if (error)
goto done;
ACCEPT_LOCK();
if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) {
ACCEPT_UNLOCK();
error = EWOULDBLOCK;
goto noconnection;
}
while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
head->so_error = ECONNABORTED;
break;
}
error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH,
"accept", 0);
if (error) {
ACCEPT_UNLOCK();
goto noconnection;
}
}
if (head->so_error) {
error = head->so_error;
head->so_error = 0;
ACCEPT_UNLOCK();
goto noconnection;
}
so = TAILQ_FIRST(&head->so_comp);
KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));
/*
* Before changing the flags on the socket, we have to bump the
* reference count. Otherwise, if the protocol calls sofree(),
* the socket will be released due to a zero refcount.
*/
SOCK_LOCK(so); /* soref() and so_state update */
soref(so); /* file descriptor reference */
TAILQ_REMOVE(&head->so_comp, so, so_list);
head->so_qlen--;
so->so_state |= (head->so_state & SS_NBIO);
so->so_qstate &= ~SQ_COMP;
so->so_head = NULL;
SOCK_UNLOCK(so);
ACCEPT_UNLOCK();
/* An extra reference on `nfp' has been held for us by falloc(). */
td->td_retval[0] = fd;
/* connection has been removed from the listen queue */
KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);
pgid = fgetown(&head->so_sigio);
if (pgid != 0)
fsetown(pgid, &so->so_sigio);
FILE_LOCK(nfp);
nfp->f_data = so; /* nfp has ref count from falloc */
nfp->f_flag = fflag;
nfp->f_ops = &socketops;
nfp->f_type = DTYPE_SOCKET;
FILE_UNLOCK(nfp);
/* Sync socket nonblocking/async state with file flags */
tmp = fflag & FNONBLOCK;
(void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td);
tmp = fflag & FASYNC;
(void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td);
sa = 0;
error = soaccept(so, &sa);
if (error) {
/*
* return a namelen of zero for older code which might
* ignore the return value from accept.
*/
if (name)
*namelen = 0;
goto noconnection;
}
if (sa == NULL) {
if (name)
*namelen = 0;
goto done;
}
if (name) {
/* check sa_len before it is destroyed */
if (*namelen > sa->sa_len)
*namelen = sa->sa_len;
*name = sa;
sa = NULL;
}
noconnection:
if (sa)
FREE(sa, M_SONAME);
/*
* close the new descriptor, assuming someone hasn't ripped it
* out from under us.
*/
if (error)
fdclose(fdp, nfp, fd, td);
/*
* Release explicitly held references before returning. We return
* a reference on nfp to the caller on success if they request it.
*/
done:
if (fp != NULL) {
if (error == 0) {
*fp = nfp;
nfp = NULL;
} else
*fp = NULL;
}
if (nfp != NULL)
fdrop(nfp, td);
fdrop(headfp, td);
done2:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE (accept1() is MPSAFE)
*/
int
accept(td, uap)
struct thread *td;
struct accept_args *uap;
{
return (accept1(td, uap, 0));
}
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE (accept1() is MPSAFE)
*/
int
oaccept(td, uap)
struct thread *td;
struct accept_args *uap;
{
return (accept1(td, uap, 1));
}
#endif /* COMPAT_OLDSOCK */
/*
* MPSAFE
*/
/* ARGSUSED */
int
connect(td, uap)
struct thread *td;
register struct connect_args /* {
int s;
caddr_t name;
int namelen;
} */ *uap;
{
struct sockaddr *sa;
int error;
error = getsockaddr(&sa, uap->name, uap->namelen);
if (error)
return (error);
error = kern_connect(td, uap->s, sa);
free(sa, M_SONAME);
return (error);
}
int
kern_connect(td, fd, sa)
struct thread *td;
int fd;
struct sockaddr *sa;
{
struct socket *so;
struct file *fp;
int error;
int interrupted = 0;
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, fd, &fp, NULL);
if (error)
goto done2;
so = fp->f_data;
if (so->so_state & SS_ISCONNECTING) {
error = EALREADY;
goto done1;
}
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_connect(td->td_ucred, so, sa);
SOCK_UNLOCK(so);
if (error)
goto bad;
#endif
error = soconnect(so, sa, td);
if (error)
goto bad;
if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
error = EINPROGRESS;
goto done1;
}
SOCK_LOCK(so);
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
"connec", 0);
if (error) {
if (error == EINTR || error == ERESTART)
interrupted = 1;
break;
}
}
if (error == 0) {
error = so->so_error;
so->so_error = 0;
}
SOCK_UNLOCK(so);
bad:
if (!interrupted)
so->so_state &= ~SS_ISCONNECTING;
if (error == ERESTART)
error = EINTR;
done1:
fdrop(fp, td);
done2:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
int
socketpair(td, uap)
struct thread *td;
register struct socketpair_args /* {
int domain;
int type;
int protocol;
int *rsv;
} */ *uap;
{
register struct filedesc *fdp = td->td_proc->p_fd;
struct file *fp1, *fp2;
struct socket *so1, *so2;
int fd, error, sv[2];
#ifdef MAC
/* We might want to have a separate check for socket pairs. */
error = mac_check_socket_create(td->td_ucred, uap->domain, uap->type,
uap->protocol);
if (error)
return (error);
#endif
NET_LOCK_GIANT();
error = socreate(uap->domain, &so1, uap->type, uap->protocol,
td->td_ucred, td);
if (error)
goto done2;
error = socreate(uap->domain, &so2, uap->type, uap->protocol,
td->td_ucred, td);
if (error)
goto free1;
/* On success extra reference to `fp1' and 'fp2' is set by falloc. */
error = falloc(td, &fp1, &fd);
if (error)
goto free2;
sv[0] = fd;
fp1->f_data = so1; /* so1 already has ref count */
error = falloc(td, &fp2, &fd);
if (error)
goto free3;
fp2->f_data = so2; /* so2 already has ref count */
sv[1] = fd;
error = soconnect2(so1, so2);
if (error)
goto free4;
if (uap->type == SOCK_DGRAM) {
/*
* Datagram socket connection is asymmetric.
*/
error = soconnect2(so2, so1);
if (error)
goto free4;
}
FILE_LOCK(fp1);
fp1->f_flag = FREAD|FWRITE;
fp1->f_ops = &socketops;
fp1->f_type = DTYPE_SOCKET;
FILE_UNLOCK(fp1);
FILE_LOCK(fp2);
fp2->f_flag = FREAD|FWRITE;
fp2->f_ops = &socketops;
fp2->f_type = DTYPE_SOCKET;
FILE_UNLOCK(fp2);
error = copyout(sv, uap->rsv, 2 * sizeof (int));
fdrop(fp1, td);
fdrop(fp2, td);
goto done2;
free4:
fdclose(fdp, fp2, sv[1], td);
fdrop(fp2, td);
free3:
fdclose(fdp, fp1, sv[0], td);
fdrop(fp1, td);
free2:
(void)soclose(so2);
free1:
(void)soclose(so1);
done2:
NET_UNLOCK_GIANT();
return (error);
}
static int
sendit(td, s, mp, flags)
register struct thread *td;
int s;
register struct msghdr *mp;
int flags;
{
struct mbuf *control;
struct sockaddr *to;
int error;
if (mp->msg_name != NULL) {
error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
if (error) {
to = NULL;
goto bad;
}
mp->msg_name = to;
} else {
to = NULL;
}
if (mp->msg_control) {
if (mp->msg_controllen < sizeof(struct cmsghdr)
#ifdef COMPAT_OLDSOCK
&& mp->msg_flags != MSG_COMPAT
#endif
) {
error = EINVAL;
goto bad;
}
error = sockargs(&control, mp->msg_control,
mp->msg_controllen, MT_CONTROL);
if (error)
goto bad;
#ifdef COMPAT_OLDSOCK
if (mp->msg_flags == MSG_COMPAT) {
register struct cmsghdr *cm;
M_PREPEND(control, sizeof(*cm), M_TRYWAIT);
if (control == 0) {
error = ENOBUFS;
goto bad;
} else {
cm = mtod(control, struct cmsghdr *);
cm->cmsg_len = control->m_len;
cm->cmsg_level = SOL_SOCKET;
cm->cmsg_type = SCM_RIGHTS;
}
}
#endif
} else {
control = NULL;
}
error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
bad:
if (to)
FREE(to, M_SONAME);
return (error);
}
int
kern_sendit(td, s, mp, flags, control, segflg)
struct thread *td;
int s;
struct msghdr *mp;
int flags;
struct mbuf *control;
enum uio_seg segflg;
{
struct file *fp;
struct uio auio;
struct iovec *iov;
struct socket *so;
int i;
int len, error;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, s, &fp, NULL);
if (error)
goto bad2;
so = (struct socket *)fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_send(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error)
goto bad;
#endif
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_segflg = segflg;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
iov = mp->msg_iov;
for (i = 0; i < mp->msg_iovlen; i++, iov++) {
if ((auio.uio_resid += iov->iov_len) < 0) {
error = EINVAL;
goto bad;
}
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif
len = auio.uio_resid;
error = sosend(so, mp->msg_name, &auio, 0, control, flags, td);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
/* Generation of SIGPIPE can be controlled per socket */
if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
!(flags & MSG_NOSIGNAL)) {
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGPIPE);
PROC_UNLOCK(td->td_proc);
}
}
if (error == 0)
td->td_retval[0] = len - auio.uio_resid;
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = td->td_retval[0];
ktrgenio(s, UIO_WRITE, ktruio, error);
}
#endif
bad:
fdrop(fp, td);
bad2:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
int
sendto(td, uap)
struct thread *td;
register struct sendto_args /* {
int s;
caddr_t buf;
size_t len;
int flags;
caddr_t to;
int tolen;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov;
int error;
msg.msg_name = uap->to;
msg.msg_namelen = uap->tolen;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
msg.msg_control = 0;
#ifdef COMPAT_OLDSOCK
msg.msg_flags = 0;
#endif
aiov.iov_base = uap->buf;
aiov.iov_len = uap->len;
error = sendit(td, uap->s, &msg, uap->flags);
return (error);
}
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE
*/
int
osend(td, uap)
struct thread *td;
register struct osend_args /* {
int s;
caddr_t buf;
int len;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov;
int error;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
aiov.iov_base = uap->buf;
aiov.iov_len = uap->len;
msg.msg_control = 0;
msg.msg_flags = 0;
error = sendit(td, uap->s, &msg, uap->flags);
return (error);
}
/*
* MPSAFE
*/
int
osendmsg(td, uap)
struct thread *td;
struct osendmsg_args /* {
int s;
caddr_t msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec *iov;
int error;
error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
if (error)
return (error);
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
if (error)
return (error);
msg.msg_iov = iov;
msg.msg_flags = MSG_COMPAT;
error = sendit(td, uap->s, &msg, uap->flags);
free(iov, M_IOV);
return (error);
}
#endif
/*
* MPSAFE
*/
int
sendmsg(td, uap)
struct thread *td;
struct sendmsg_args /* {
int s;
caddr_t msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec *iov;
int error;
error = copyin(uap->msg, &msg, sizeof (msg));
if (error)
return (error);
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
if (error)
return (error);
msg.msg_iov = iov;
#ifdef COMPAT_OLDSOCK
msg.msg_flags = 0;
#endif
error = sendit(td, uap->s, &msg, uap->flags);
free(iov, M_IOV);
return (error);
}
int
kern_recvit(td, s, mp, fromseg, controlp)
struct thread *td;
int s;
struct msghdr *mp;
enum uio_seg fromseg;
struct mbuf **controlp;
{
struct uio auio;
struct iovec *iov;
int i;
socklen_t len;
int error;
struct mbuf *m, *control = 0;
caddr_t ctlbuf;
struct file *fp;
struct socket *so;
struct sockaddr *fromsa = 0;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
if(controlp != NULL)
*controlp = 0;
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, s, &fp, NULL);
if (error) {
NET_UNLOCK_GIANT();
return (error);
}
so = fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_receive(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error) {
fdrop(fp, td);
NET_UNLOCK_GIANT();
return (error);
}
#endif
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
iov = mp->msg_iov;
for (i = 0; i < mp->msg_iovlen; i++, iov++) {
if ((auio.uio_resid += iov->iov_len) < 0) {
fdrop(fp, td);
NET_UNLOCK_GIANT();
return (EINVAL);
}
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif
len = auio.uio_resid;
error = soreceive(so, &fromsa, &auio, (struct mbuf **)0,
(mp->msg_control || controlp) ? &control : (struct mbuf **)0,
&mp->msg_flags);
if (error) {
if (auio.uio_resid != (int)len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
}
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = (int)len - auio.uio_resid;
ktrgenio(s, UIO_READ, ktruio, error);
}
#endif
if (error)
goto out;
td->td_retval[0] = (int)len - auio.uio_resid;
if (mp->msg_name) {
len = mp->msg_namelen;
if (len <= 0 || fromsa == 0)
len = 0;
else {
/* save sa_len before it is destroyed by MSG_COMPAT */
len = MIN(len, fromsa->sa_len);
#ifdef COMPAT_OLDSOCK
if (mp->msg_flags & MSG_COMPAT)
((struct osockaddr *)fromsa)->sa_family =
fromsa->sa_family;
#endif
if (fromseg == UIO_USERSPACE) {
error = copyout(fromsa, mp->msg_name,
(unsigned)len);
if (error)
goto out;
} else
bcopy(fromsa, mp->msg_name, len);
}
mp->msg_namelen = len;
}
if (mp->msg_control && controlp == NULL) {
#ifdef COMPAT_OLDSOCK
/*
* We assume that old recvmsg calls won't receive access
* rights and other control info, esp. as control info
* is always optional and those options didn't exist in 4.3.
* If we receive rights, trim the cmsghdr; anything else
* is tossed.
*/
if (control && mp->msg_flags & MSG_COMPAT) {
if (mtod(control, struct cmsghdr *)->cmsg_level !=
SOL_SOCKET ||
mtod(control, struct cmsghdr *)->cmsg_type !=
SCM_RIGHTS) {
mp->msg_controllen = 0;
goto out;
}
control->m_len -= sizeof (struct cmsghdr);
control->m_data += sizeof (struct cmsghdr);
}
#endif
len = mp->msg_controllen;
m = control;
mp->msg_controllen = 0;
ctlbuf = mp->msg_control;
while (m && len > 0) {
unsigned int tocopy;
if (len >= m->m_len)
tocopy = m->m_len;
else {
mp->msg_flags |= MSG_CTRUNC;
tocopy = len;
}
if ((error = copyout(mtod(m, caddr_t),
ctlbuf, tocopy)) != 0)
goto out;
ctlbuf += tocopy;
len -= tocopy;
m = m->m_next;
}
mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control;
}
out:
fdrop(fp, td);
NET_UNLOCK_GIANT();
if (fromsa)
FREE(fromsa, M_SONAME);
if (error == 0 && controlp != NULL)
*controlp = control;
else if (control)
m_freem(control);
return (error);
}
static int
recvit(td, s, mp, namelenp)
struct thread *td;
int s;
struct msghdr *mp;
void *namelenp;
{
int error;
error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL);
if (error)
return (error);
if (namelenp) {
error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t));
#ifdef COMPAT_OLDSOCK
if (mp->msg_flags & MSG_COMPAT)
error = 0; /* old recvfrom didn't check */
#endif
}
return (error);
}
/*
* MPSAFE
*/
int
recvfrom(td, uap)
struct thread *td;
register struct recvfrom_args /* {
int s;
caddr_t buf;
size_t len;
int flags;
struct sockaddr * __restrict from;
socklen_t * __restrict fromlenaddr;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov;
int error;
if (uap->fromlenaddr) {
error = copyin(uap->fromlenaddr,
&msg.msg_namelen, sizeof (msg.msg_namelen));
if (error)
goto done2;
} else {
msg.msg_namelen = 0;
}
msg.msg_name = uap->from;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
aiov.iov_base = uap->buf;
aiov.iov_len = uap->len;
msg.msg_control = 0;
msg.msg_flags = uap->flags;
error = recvit(td, uap->s, &msg, uap->fromlenaddr);
done2:
return(error);
}
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE
*/
int
orecvfrom(td, uap)
struct thread *td;
struct recvfrom_args *uap;
{
uap->flags |= MSG_COMPAT;
return (recvfrom(td, uap));
}
#endif
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE
*/
int
orecv(td, uap)
struct thread *td;
register struct orecv_args /* {
int s;
caddr_t buf;
int len;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov;
int error;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &aiov;
msg.msg_iovlen = 1;
aiov.iov_base = uap->buf;
aiov.iov_len = uap->len;
msg.msg_control = 0;
msg.msg_flags = uap->flags;
error = recvit(td, uap->s, &msg, NULL);
return (error);
}
/*
* Old recvmsg. This code takes advantage of the fact that the old msghdr
* overlays the new one, missing only the flags, and with the (old) access
* rights where the control fields are now.
*
* MPSAFE
*/
int
orecvmsg(td, uap)
struct thread *td;
struct orecvmsg_args /* {
int s;
struct omsghdr *msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec *iov;
int error;
error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
if (error)
return (error);
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
if (error)
return (error);
msg.msg_flags = uap->flags | MSG_COMPAT;
msg.msg_iov = iov;
error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen);
if (msg.msg_controllen && error == 0)
error = copyout(&msg.msg_controllen,
&uap->msg->msg_accrightslen, sizeof (int));
free(iov, M_IOV);
return (error);
}
#endif
/*
* MPSAFE
*/
int
recvmsg(td, uap)
struct thread *td;
struct recvmsg_args /* {
int s;
struct msghdr *msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec *uiov, *iov;
int error;
error = copyin(uap->msg, &msg, sizeof (msg));
if (error)
return (error);
error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
if (error)
return (error);
msg.msg_flags = uap->flags;
#ifdef COMPAT_OLDSOCK
msg.msg_flags &= ~MSG_COMPAT;
#endif
uiov = msg.msg_iov;
msg.msg_iov = iov;
error = recvit(td, uap->s, &msg, NULL);
if (error == 0) {
msg.msg_iov = uiov;
error = copyout(&msg, uap->msg, sizeof(msg));
}
free(iov, M_IOV);
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
shutdown(td, uap)
struct thread *td;
register struct shutdown_args /* {
int s;
int how;
} */ *uap;
{
struct socket *so;
struct file *fp;
int error;
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, uap->s, &fp, NULL);
if (error == 0) {
so = fp->f_data;
error = soshutdown(so, uap->how);
fdrop(fp, td);
}
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
setsockopt(td, uap)
struct thread *td;
register struct setsockopt_args /* {
int s;
int level;
int name;
caddr_t val;
int valsize;
} */ *uap;
{
return (kern_setsockopt(td, uap->s, uap->level, uap->name,
uap->val, UIO_USERSPACE, uap->valsize));
}
int
kern_setsockopt(td, s, level, name, val, valseg, valsize)
struct thread *td;
int s;
int level;
int name;
void *val;
enum uio_seg valseg;
socklen_t valsize;
{
int error;
struct socket *so;
struct file *fp;
struct sockopt sopt;
if (val == NULL && valsize != 0)
return (EFAULT);
if ((int)valsize < 0)
return (EINVAL);
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = level;
sopt.sopt_name = name;
sopt.sopt_val = val;
sopt.sopt_valsize = valsize;
switch (valseg) {
case UIO_USERSPACE:
sopt.sopt_td = td;
break;
case UIO_SYSSPACE:
sopt.sopt_td = NULL;
break;
default:
panic("kern_setsockopt called with bad valseg");
}
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, s, &fp, NULL);
if (error == 0) {
so = fp->f_data;
error = sosetopt(so, &sopt);
fdrop(fp, td);
}
NET_UNLOCK_GIANT();
return(error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
getsockopt(td, uap)
struct thread *td;
register struct getsockopt_args /* {
int s;
int level;
int name;
void * __restrict val;
socklen_t * __restrict avalsize;
} */ *uap;
{
socklen_t valsize;
int error;
if (uap->val) {
error = copyin(uap->avalsize, &valsize, sizeof (valsize));
if (error)
return (error);
}
error = kern_getsockopt(td, uap->s, uap->level, uap->name,
uap->val, UIO_USERSPACE, &valsize);
if (error == 0)
error = copyout(&valsize, uap->avalsize, sizeof (valsize));
return (error);
}
/*
* Kernel version of getsockopt.
* optval can be a userland or userspace. optlen is always a kernel pointer.
*/
int
kern_getsockopt(td, s, level, name, val, valseg, valsize)
struct thread *td;
int s;
int level;
int name;
void *val;
enum uio_seg valseg;
socklen_t *valsize;
{
int error;
struct socket *so;
struct file *fp;
struct sockopt sopt;
if (val == NULL)
*valsize = 0;
if ((int)*valsize < 0)
return (EINVAL);
sopt.sopt_dir = SOPT_GET;
sopt.sopt_level = level;
sopt.sopt_name = name;
sopt.sopt_val = val;
sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */
switch (valseg) {
case UIO_USERSPACE:
sopt.sopt_td = td;
break;
case UIO_SYSSPACE:
sopt.sopt_td = NULL;
break;
default:
panic("kern_getsockopt called with bad valseg");
}
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, s, &fp, NULL);
if (error == 0) {
so = fp->f_data;
error = sogetopt(so, &sopt);
*valsize = sopt.sopt_valsize;
fdrop(fp, td);
}
NET_UNLOCK_GIANT();
return (error);
}
/*
* getsockname1() - Get socket name.
*
* MPSAFE
*/
/* ARGSUSED */
static int
getsockname1(td, uap, compat)
struct thread *td;
register struct getsockname_args /* {
int fdes;
struct sockaddr * __restrict asa;
socklen_t * __restrict alen;
} */ *uap;
int compat;
{
struct sockaddr *sa;
socklen_t len;
int error;
error = copyin(uap->alen, &len, sizeof(len));
if (error)
return (error);
error = kern_getsockname(td, uap->fdes, &sa, &len);
if (error)
return (error);
if (len != 0) {
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family = sa->sa_family;
#endif
error = copyout(sa, uap->asa, (u_int)len);
}
free(sa, M_SONAME);
if (error == 0)
error = copyout(&len, uap->alen, sizeof(len));
return (error);
}
int
kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
socklen_t *alen)
{
struct socket *so;
struct file *fp;
socklen_t len;
int error;
if (*alen < 0)
return (EINVAL);
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, fd, &fp, NULL);
if (error)
goto done;
so = fp->f_data;
*sa = NULL;
error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa);
if (error)
goto bad;
if (*sa == NULL)
len = 0;
else
len = MIN(*alen, (*sa)->sa_len);
*alen = len;
bad:
fdrop(fp, td);
if (error && *sa) {
free(*sa, M_SONAME);
*sa = NULL;
}
done:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
int
getsockname(td, uap)
struct thread *td;
struct getsockname_args *uap;
{
return (getsockname1(td, uap, 0));
}
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE
*/
int
ogetsockname(td, uap)
struct thread *td;
struct getsockname_args *uap;
{
return (getsockname1(td, uap, 1));
}
#endif /* COMPAT_OLDSOCK */
/*
* getpeername1() - Get name of peer for connected socket.
*
* MPSAFE
*/
/* ARGSUSED */
static int
getpeername1(td, uap, compat)
struct thread *td;
register struct getpeername_args /* {
int fdes;
struct sockaddr * __restrict asa;
socklen_t * __restrict alen;
} */ *uap;
int compat;
{
struct sockaddr *sa;
socklen_t len;
int error;
error = copyin(uap->alen, &len, sizeof (len));
if (error)
return (error);
error = kern_getpeername(td, uap->fdes, &sa, &len);
if (error)
return (error);
if (len != 0) {
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family = sa->sa_family;
#endif
error = copyout(sa, uap->asa, (u_int)len);
}
free(sa, M_SONAME);
if (error == 0)
error = copyout(&len, uap->alen, sizeof(len));
return (error);
}
int
kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
socklen_t *alen)
{
struct socket *so;
struct file *fp;
socklen_t len;
int error;
if (*alen < 0)
return (EINVAL);
NET_LOCK_GIANT();
error = getsock(td->td_proc->p_fd, fd, &fp, NULL);
if (error)
goto done2;
so = fp->f_data;
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
error = ENOTCONN;
goto done1;
}
*sa = NULL;
error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa);
if (error)
goto bad;
if (*sa == NULL)
len = 0;
else
len = MIN(*alen, (*sa)->sa_len);
*alen = len;
bad:
if (error && *sa) {
free(*sa, M_SONAME);
*sa = NULL;
}
done1:
fdrop(fp, td);
done2:
NET_UNLOCK_GIANT();
return (error);
}
/*
* MPSAFE
*/
int
getpeername(td, uap)
struct thread *td;
struct getpeername_args *uap;
{
return (getpeername1(td, uap, 0));
}
#ifdef COMPAT_OLDSOCK
/*
* MPSAFE
*/
int
ogetpeername(td, uap)
struct thread *td;
struct ogetpeername_args *uap;
{
/* XXX uap should have type `getpeername_args *' to begin with. */
return (getpeername1(td, (struct getpeername_args *)uap, 1));
}
#endif /* COMPAT_OLDSOCK */
int
sockargs(mp, buf, buflen, type)
struct mbuf **mp;
caddr_t buf;
int buflen, type;
{
register struct sockaddr *sa;
register struct mbuf *m;
int error;
if ((u_int)buflen > MLEN) {
#ifdef COMPAT_OLDSOCK
if (type == MT_SONAME && (u_int)buflen <= 112)
buflen = MLEN; /* unix domain compat. hack */
else
#endif
if ((u_int)buflen > MCLBYTES)
return (EINVAL);
}
m = m_get(M_TRYWAIT, type);
if (m == NULL)
return (ENOBUFS);
if ((u_int)buflen > MLEN) {
MCLGET(m, M_TRYWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
return (ENOBUFS);
}
}
m->m_len = buflen;
error = copyin(buf, mtod(m, caddr_t), (u_int)buflen);
if (error)
(void) m_free(m);
else {
*mp = m;
if (type == MT_SONAME) {
sa = mtod(m, struct sockaddr *);
#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
sa->sa_family = sa->sa_len;
#endif
sa->sa_len = buflen;
}
}
return (error);
}
int
getsockaddr(namp, uaddr, len)
struct sockaddr **namp;
caddr_t uaddr;
size_t len;
{
struct sockaddr *sa;
int error;
if (len > SOCK_MAXADDRLEN)
return (ENAMETOOLONG);
if (len < offsetof(struct sockaddr, sa_data[0]))
return (EINVAL);
MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK);
error = copyin(uaddr, sa, len);
if (error) {
FREE(sa, M_SONAME);
} else {
#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
sa->sa_family = sa->sa_len;
#endif
sa->sa_len = len;
*namp = sa;
}
return (error);
}
/*
* Detach mapped page and release resources back to the system.
*/
void
sf_buf_mext(void *addr, void *args)
{
vm_page_t m;
m = sf_buf_page(args);
sf_buf_free(args);
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
}
/*
* sendfile(2)
*
* MPSAFE
*
* int sendfile(int fd, int s, off_t offset, size_t nbytes,
* struct sf_hdtr *hdtr, off_t *sbytes, int flags)
*
* Send a file specified by 'fd' and starting at 'offset' to a socket
* specified by 's'. Send only 'nbytes' of the file or until EOF if
* nbytes == 0. Optionally add a header and/or trailer to the socket
* output. If specified, write the total number of bytes sent into *sbytes.
*
*/
int
sendfile(struct thread *td, struct sendfile_args *uap)
{
return (do_sendfile(td, uap, 0));
}
static int
do_sendfile(struct thread *td, struct sendfile_args *uap, int compat)
{
struct sf_hdtr hdtr;
struct uio *hdr_uio, *trl_uio;
int error;
hdr_uio = trl_uio = NULL;
if (uap->hdtr != NULL) {
error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
if (error)
goto out;
if (hdtr.headers != NULL) {
error = copyinuio(hdtr.headers, hdtr.hdr_cnt, &hdr_uio);
if (error)
goto out;
}
if (hdtr.trailers != NULL) {
error = copyinuio(hdtr.trailers, hdtr.trl_cnt, &trl_uio);
if (error)
goto out;
}
}
error = kern_sendfile(td, uap, hdr_uio, trl_uio, compat);
out:
if (hdr_uio)
free(hdr_uio, M_IOV);
if (trl_uio)
free(trl_uio, M_IOV);
return (error);
}
#ifdef COMPAT_FREEBSD4
int
freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
{
struct sendfile_args args;
args.fd = uap->fd;
args.s = uap->s;
args.offset = uap->offset;
args.nbytes = uap->nbytes;
args.hdtr = uap->hdtr;
args.sbytes = uap->sbytes;
args.flags = uap->flags;
return (do_sendfile(td, &args, 1));
}
#endif /* COMPAT_FREEBSD4 */
int
kern_sendfile(struct thread *td, struct sendfile_args *uap,
struct uio *hdr_uio, struct uio *trl_uio, int compat)
{
struct file *sock_fp;
struct vnode *vp;
struct vm_object *obj = NULL;
struct socket *so = NULL;
struct mbuf *m = NULL;
struct sf_buf *sf;
struct vm_page *pg;
off_t off, xfsize, sbytes = 0, rem = 0;
int error, mnw = 0;
int vfslocked;
NET_LOCK_GIANT();
/*
* The file descriptor must be a regular file and have a
* backing VM object.
* File offset must be positive. If it goes beyond EOF
* we send only the header/trailer and no payload data.
*/
if ((error = fgetvp_read(td, uap->fd, &vp)) != 0)
goto out;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
obj = vp->v_object;
if (obj != NULL) {
/*
* Temporarily increase the backing VM object's reference
* count so that a forced reclamation of its vnode does not
* immediately destroy it.
*/
VM_OBJECT_LOCK(obj);
if ((obj->flags & OBJ_DEAD) == 0) {
vm_object_reference_locked(obj);
VM_OBJECT_UNLOCK(obj);
} else {
VM_OBJECT_UNLOCK(obj);
obj = NULL;
}
}
VOP_UNLOCK(vp, 0, td);
VFS_UNLOCK_GIANT(vfslocked);
if (obj == NULL) {
error = EINVAL;
goto out;
}
if (uap->offset < 0) {
error = EINVAL;
goto out;
}
/*
* The socket must be a stream socket and connected.
* Remember if it a blocking or non-blocking socket.
*/
if ((error = getsock(td->td_proc->p_fd, uap->s, &sock_fp,
NULL)) != 0)
goto out;
so = sock_fp->f_data;
if (so->so_type != SOCK_STREAM) {
error = EINVAL;
goto out;
}
if ((so->so_state & SS_ISCONNECTED) == 0) {
error = ENOTCONN;
goto out;
}
/*
* Do not wait on memory allocations but return ENOMEM for
* caller to retry later.
* XXX: Experimental.
*/
if (uap->flags & SF_MNOWAIT)
mnw = 1;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_send(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error)
goto out;
#endif
/* If headers are specified copy them into mbufs. */
if (hdr_uio != NULL) {
hdr_uio->uio_td = td;
hdr_uio->uio_rw = UIO_WRITE;
if (hdr_uio->uio_resid > 0) {
/*
* In FBSD < 5.0 the nbytes to send also included
* the header. If compat is specified subtract the
* header size from nbytes.
*/
if (compat) {
if (uap->nbytes > hdr_uio->uio_resid)
uap->nbytes -= hdr_uio->uio_resid;
else
uap->nbytes = 0;
}
m = m_uiotombuf(hdr_uio, (mnw ? M_NOWAIT : M_WAITOK),
0, 0, 0);
if (m == NULL) {
error = mnw ? EAGAIN : ENOBUFS;
goto out;
}
}
}
/* Protect against multiple writers to the socket. */
SOCKBUF_LOCK(&so->so_snd);
(void) sblock(&so->so_snd, M_WAITOK);
SOCKBUF_UNLOCK(&so->so_snd);
/*
* Loop through the pages of the file, starting with the requested
* offset. Get a file page (do I/O if necessary), map the file page
* into an sf_buf, attach an mbuf header to the sf_buf, and queue
* it on the socket.
* This is done in two loops. The inner loop turns as many pages
* as it can, up to available socket buffer space, without blocking
* into mbufs to have it bulk delivered into the socket send buffer.
* The outer loop checks the state and available space of the socket
* and takes care of the overall progress.
*/
for (off = uap->offset; ; ) {
int loopbytes = 0;
int space = 0;
int done = 0;
/*
* Check the socket state for ongoing connection,
* no errors and space in socket buffer.
* If space is low allow for the remainder of the
* file to be processed if it fits the socket buffer.
* Otherwise block in waiting for sufficient space
* to proceed, or if the socket is nonblocking, return
* to userland with EAGAIN while reporting how far
* we've come.
* We wait until the socket buffer has significant free
* space to do bulk sends. This makes good use of file
* system read ahead and allows packet segmentation
* offloading hardware to take over lots of work. If
* we were not careful here we would send off only one
* sfbuf at a time.
*/
SOCKBUF_LOCK(&so->so_snd);
if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
retry_space:
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
error = EPIPE;
SOCKBUF_UNLOCK(&so->so_snd);
goto done;
} else if (so->so_error) {
error = so->so_error;
so->so_error = 0;
SOCKBUF_UNLOCK(&so->so_snd);
goto done;
}
space = sbspace(&so->so_snd);
if (space < rem &&
(space <= 0 ||
space < so->so_snd.sb_lowat)) {
if (so->so_state & SS_NBIO) {
SOCKBUF_UNLOCK(&so->so_snd);
error = EAGAIN;
goto done;
}
/*
* sbwait drops the lock while sleeping.
* When we loop back to retry_space the
* state may have changed and we retest
* for it.
*/
error = sbwait(&so->so_snd);
/*
* An error from sbwait usually indicates that we've
* been interrupted by a signal. If we've sent anything
* then return bytes sent, otherwise return the error.
*/
if (error) {
SOCKBUF_UNLOCK(&so->so_snd);
goto done;
}
goto retry_space;
}
SOCKBUF_UNLOCK(&so->so_snd);
/*
* Loop and construct maximum sized mbuf chain to be bulk
* dumped into socket buffer.
*/
while(space > loopbytes) {
vm_pindex_t pindex;
vm_offset_t pgoff;
struct mbuf *m0;
VM_OBJECT_LOCK(obj);
/*
* Calculate the amount to transfer.
* Not to exceed a page, the EOF,
* or the passed in nbytes.
*/
pgoff = (vm_offset_t)(off & PAGE_MASK);
xfsize = omin(PAGE_SIZE - pgoff,
obj->un_pager.vnp.vnp_size - off -
sbytes - loopbytes);
if (uap->nbytes)
rem = (uap->nbytes - sbytes - loopbytes);
else
rem = obj->un_pager.vnp.vnp_size - off -
sbytes - loopbytes;
xfsize = omin(rem, xfsize);
if (xfsize <= 0) {
VM_OBJECT_UNLOCK(obj);
done = 1; /* all data sent */
break;
}
/*
* Don't overflow the send buffer.
* Stop here and send out what we've
* already got.
*/
if (space < loopbytes + xfsize) {
VM_OBJECT_UNLOCK(obj);
break;
}
retry_lookup:
/*
* Attempt to look up the page.
* Allocate if not found or
* wait and loop if busy.
*/
pindex = OFF_TO_IDX(off);
pg = vm_page_lookup(obj, pindex);
if (pg == NULL) {
pg = vm_page_alloc(obj, pindex,
VM_ALLOC_NOBUSY | VM_ALLOC_NORMAL |
VM_ALLOC_WIRED);
if (pg == NULL) {
VM_OBJECT_UNLOCK(obj);
VM_WAIT;
VM_OBJECT_LOCK(obj);
goto retry_lookup;
}
} else if (vm_page_sleep_if_busy(pg, TRUE, "sfpbsy"))
goto retry_lookup;
else {
/*
* Wire the page so it does not get
* ripped out from under us.
*/
vm_page_lock_queues();
vm_page_wire(pg);
vm_page_unlock_queues();
}
/*
* Check if page is valid for what we need,
* otherwise initiate I/O.
* If we already turned some pages into mbufs,
* send them off before we come here again and
* block.
*/
if (pg->valid && vm_page_is_valid(pg, pgoff, xfsize))
VM_OBJECT_UNLOCK(obj);
else if (m != NULL)
error = EAGAIN; /* send what we already got */
else if (uap->flags & SF_NODISKIO)
error = EBUSY;
else {
int bsize, resid;
/*
* Ensure that our page is still around
* when the I/O completes.
*/
vm_page_io_start(pg);
VM_OBJECT_UNLOCK(obj);
/*
* Get the page from backing store.
*/
bsize = vp->v_mount->mnt_stat.f_iosize;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_SHARED | LK_RETRY, td);
/*
* XXXMAC: Because we don't have fp->f_cred
* here, we pass in NOCRED. This is probably
* wrong, but is consistent with our original
* implementation.
*/
error = vn_rdwr(UIO_READ, vp, NULL, MAXBSIZE,
trunc_page(off), UIO_NOCOPY, IO_NODELOCKED |
IO_VMIO | ((MAXBSIZE / bsize) << IO_SEQSHIFT),
td->td_ucred, NOCRED, &resid, td);
VOP_UNLOCK(vp, 0, td);
VFS_UNLOCK_GIANT(vfslocked);
VM_OBJECT_LOCK(obj);
vm_page_io_finish(pg);
if (!error)
VM_OBJECT_UNLOCK(obj);
mbstat.sf_iocnt++;
}
if (error) {
vm_page_lock_queues();
vm_page_unwire(pg, 0);
/*
* See if anyone else might know about
* this page. If not and it is not valid,
* then free it.
*/
if (pg->wire_count == 0 && pg->valid == 0 &&
pg->busy == 0 && !(pg->oflags & VPO_BUSY) &&
pg->hold_count == 0) {
vm_page_free(pg);
}
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(obj);
if (error == EAGAIN)
error = 0; /* not a real error */
break;
}
/*
* Get a sendfile buf. We usually wait as long
* as necessary, but this wait can be interrupted.
*/
if ((sf = sf_buf_alloc(pg,
(mnw ? SFB_NOWAIT : SFB_CATCH))) == NULL) {
mbstat.sf_allocfail++;
vm_page_lock_queues();
vm_page_unwire(pg, 0);
/*
* XXX: Not same check as above!?
*/
if (pg->wire_count == 0 && pg->object == NULL)
vm_page_free(pg);
vm_page_unlock_queues();
error = (mnw ? EAGAIN : EINTR);
break;
}
/*
* Get an mbuf and set it up as having
* external storage.
*/
m0 = m_get((mnw ? M_NOWAIT : M_WAITOK), MT_DATA);
if (m0 == NULL) {
error = (mnw ? EAGAIN : ENOBUFS);
sf_buf_mext((void *)sf_buf_kva(sf), sf);
break;
}
MEXTADD(m0, sf_buf_kva(sf), PAGE_SIZE, sf_buf_mext,
sf, M_RDONLY, EXT_SFBUF);
m0->m_data = (char *)sf_buf_kva(sf) + pgoff;
m0->m_len = xfsize;
/* Append to mbuf chain. */
if (m != NULL)
m_cat(m, m0);
else
m = m0;
/* Keep track of bits processed. */
loopbytes += xfsize;
off += xfsize;
}
/* Add the buffer chain to the socket buffer. */
if (m != NULL) {
int mlen;
mlen = m_length(m, NULL);
SOCKBUF_LOCK(&so->so_snd);
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
error = EPIPE;
SOCKBUF_UNLOCK(&so->so_snd);
goto done;
}
SOCKBUF_UNLOCK(&so->so_snd);
error = (*so->so_proto->pr_usrreqs->pru_send)
(so, 0, m, NULL, NULL, td);
if (!error)
sbytes += mlen;
m = NULL; /* pru_send always consumes */
}
/* Quit outer loop on error or when we're done. */
if (error || done)
goto done;
}
/*
* Send trailers. Wimp out and use writev(2).
*/
if (trl_uio != NULL) {
error = kern_writev(td, uap->s, trl_uio);
if (error)
goto done;
sbytes += td->td_retval[0];
}
done:
SOCKBUF_LOCK(&so->so_snd);
sbunlock(&so->so_snd);
SOCKBUF_UNLOCK(&so->so_snd);
out:
/*
* If there was no error we have to clear td->td_retval[0]
* because it may have been set by writev.
*/
if (error == 0) {
td->td_retval[0] = 0;
}
if (uap->sbytes != NULL) {
copyout(&sbytes, uap->sbytes, sizeof(off_t));
}
if (obj != NULL)
vm_object_deallocate(obj);
if (vp != NULL) {
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vrele(vp);
VFS_UNLOCK_GIANT(vfslocked);
}
if (so)
fdrop(sock_fp, td);
if (m)
m_freem(m);
NET_UNLOCK_GIANT();
if (error == ERESTART)
error = EINTR;
return (error);
}
/*
* SCTP syscalls.
* Functionality only compiled in if SCTP is defined in the kernel Makefile,
* otherwise all return EOPNOTSUPP.
* XXX: We should make this loadable one day.
*/
int
sctp_peeloff(td, uap)
struct thread *td;
struct sctp_peeloff_args /* {
int sd;
caddr_t name;
} */ *uap;
{
#ifdef SCTP
struct filedesc *fdp;
struct file *nfp = NULL;
int error;
struct socket *head, *so;
int fd;
u_int fflag;
fdp = td->td_proc->p_fd;
error = fgetsock(td, uap->sd, &head, &fflag);
if (error)
goto done2;
error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
if (error)
goto done2;
/*
* At this point we know we do have a assoc to pull
* we proceed to get the fd setup. This may block
* but that is ok.
*/
error = falloc(td, &nfp, &fd);
if (error)
goto done;
td->td_retval[0] = fd;
so = sonewconn(head, SS_ISCONNECTED);
if (so == NULL)
goto noconnection;
/*
* Before changing the flags on the socket, we have to bump the
* reference count. Otherwise, if the protocol calls sofree(),
* the socket will be released due to a zero refcount.
*/
SOCK_LOCK(so);
soref(so); /* file descriptor reference */
SOCK_UNLOCK(so);
ACCEPT_LOCK();
TAILQ_REMOVE(&head->so_comp, so, so_list);
head->so_qlen--;
so->so_state |= (head->so_state & SS_NBIO);
so->so_state &= ~SS_NOFDREF;
so->so_qstate &= ~SQ_COMP;
so->so_head = NULL;
ACCEPT_UNLOCK();
error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
if (error)
goto noconnection;
if (head->so_sigio != NULL)
fsetown(fgetown(&head->so_sigio), &so->so_sigio);
FILE_LOCK(nfp);
nfp->f_data = so;
nfp->f_flag = fflag;
nfp->f_ops = &socketops;
nfp->f_type = DTYPE_SOCKET;
FILE_UNLOCK(nfp);
noconnection:
/*
* close the new descriptor, assuming someone hasn't ripped it
* out from under us.
*/
if (error)
fdclose(fdp, nfp, fd, td);
/*
* Release explicitly held references before returning.
*/
done:
if (nfp != NULL)
fdrop(nfp, td);
fputsock(head);
done2:
return (error);
#else /* SCTP */
return (EOPNOTSUPP);
#endif /* SCTP */
}
int
sctp_generic_sendmsg (td, uap)
struct thread *td;
struct sctp_generic_sendmsg_args /* {
int sd,
caddr_t msg,
int mlen,
caddr_t to,
__socklen_t tolen,
struct sctp_sndrcvinfo *sinfo,
int flags
} */ *uap;
{
#ifdef SCTP
struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
struct socket *so;
struct file *fp;
int use_rcvinfo = 1;
int error = 0, len;
struct sockaddr *to = NULL;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
struct uio auio;
struct iovec iov[1];
if (uap->sinfo) {
error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
if (error)
return (error);
u_sinfo = &sinfo;
}
if (uap->tolen) {
error = getsockaddr(&to, uap->to, uap->tolen);
if (error) {
to = NULL;
goto sctp_bad2;
}
}
error = getsock(td->td_proc->p_fd, uap->sd, &fp, NULL);
if (error)
goto sctp_bad;
iov[0].iov_base = uap->msg;
iov[0].iov_len = uap->mlen;
so = (struct socket *)fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_send(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error)
goto sctp_bad;
#endif /* MAC */
auio.uio_iov = iov;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
len = auio.uio_resid = uap->mlen;
error = sctp_lower_sosend(so, to, &auio,
(struct mbuf *)NULL, (struct mbuf *)NULL,
uap->flags, use_rcvinfo, u_sinfo, td);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
/* Generation of SIGPIPE can be controlled per socket. */
if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
!(uap->flags & MSG_NOSIGNAL)) {
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGPIPE);
PROC_UNLOCK(td->td_proc);
}
}
if (error == 0)
td->td_retval[0] = len - auio.uio_resid;
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = td->td_retval[0];
ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
}
#endif /* KTRACE */
sctp_bad:
fdrop(fp, td);
sctp_bad2:
if (to)
free(to, M_SONAME);
return (error);
#else /* SCTP */
return (EOPNOTSUPP);
#endif /* SCTP */
}
int
sctp_generic_sendmsg_iov(td, uap)
struct thread *td;
struct sctp_generic_sendmsg_iov_args /* {
int sd,
struct iovec *iov,
int iovlen,
caddr_t to,
__socklen_t tolen,
struct sctp_sndrcvinfo *sinfo,
int flags
} */ *uap;
{
#ifdef SCTP
struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
struct socket *so;
struct file *fp;
int use_rcvinfo = 1;
int error=0, len, i;
struct sockaddr *to = NULL;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
struct uio auio;
struct iovec *iov, *tiov;
if (uap->sinfo) {
error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
if (error)
return (error);
u_sinfo = &sinfo;
}
if (uap->tolen) {
error = getsockaddr(&to, uap->to, uap->tolen);
if (error) {
to = NULL;
goto sctp_bad2;
}
}
error = getsock(td->td_proc->p_fd, uap->sd, &fp, NULL);
if (error)
goto sctp_bad1;
error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
if (error)
goto sctp_bad1;
so = (struct socket *)fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_send(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error)
goto sctp_bad;
#endif /* MAC */
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
tiov = iov;
for (i = 0; i <uap->iovlen; i++, tiov++) {
if ((auio.uio_resid += tiov->iov_len) < 0) {
error = EINVAL;
goto sctp_bad;
}
}
len = auio.uio_resid;
error = sctp_lower_sosend(so, to, &auio,
(struct mbuf *)NULL, (struct mbuf *)NULL,
uap->flags, use_rcvinfo, u_sinfo, td);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
/* Generation of SIGPIPE can be controlled per socket */
if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
!(uap->flags & MSG_NOSIGNAL)) {
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGPIPE);
PROC_UNLOCK(td->td_proc);
}
}
if (error == 0)
td->td_retval[0] = len - auio.uio_resid;
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = td->td_retval[0];
ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
}
#endif /* KTRACE */
sctp_bad:
free(iov, M_IOV);
sctp_bad1:
fdrop(fp, td);
sctp_bad2:
if (to)
free(to, M_SONAME);
return (error);
#else /* SCTP */
return (EOPNOTSUPP);
#endif /* SCTP */
}
int
sctp_generic_recvmsg(td, uap)
struct thread *td;
struct sctp_generic_recvmsg_args /* {
int sd,
struct iovec *iov,
int iovlen,
struct sockaddr *from,
__socklen_t *fromlenaddr,
struct sctp_sndrcvinfo *sinfo,
int *msg_flags
} */ *uap;
{
#ifdef SCTP
u_int8_t sockbufstore[256];
struct uio auio;
struct iovec *iov, *tiov;
struct sctp_sndrcvinfo sinfo;
struct socket *so;
struct file *fp;
struct sockaddr *fromsa;
int fromlen;
int len, i, msg_flags = 0;
int error = 0;
#ifdef KTRACE
struct uio *ktruio = NULL;
#endif
error = getsock(td->td_proc->p_fd, uap->sd, &fp, NULL);
if (error) {
return (error);
}
error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
if (error) {
goto out1;
}
so = fp->f_data;
#ifdef MAC
SOCK_LOCK(so);
error = mac_check_socket_receive(td->td_ucred, so);
SOCK_UNLOCK(so);
if (error) {
goto out;
return (error);
}
#endif /* MAC */
if (uap->fromlenaddr) {
error = copyin(uap->fromlenaddr,
&fromlen, sizeof (fromlen));
if (error) {
goto out;
}
} else {
fromlen = 0;
}
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovlen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
auio.uio_offset = 0; /* XXX */
auio.uio_resid = 0;
tiov = iov;
for (i = 0; i <uap->iovlen; i++, tiov++) {
if ((auio.uio_resid += tiov->iov_len) < 0) {
error = EINVAL;
goto out;
}
}
len = auio.uio_resid;
fromsa = (struct sockaddr *)sockbufstore;
#ifdef KTRACE
if (KTRPOINT(td, KTR_GENIO))
ktruio = cloneuio(&auio);
#endif /* KTRACE */
error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
fromsa, fromlen, &msg_flags,
(struct sctp_sndrcvinfo *)&sinfo, 1);
if (error) {
if (auio.uio_resid != (int)len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
} else {
if (uap->sinfo)
error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
}
#ifdef KTRACE
if (ktruio != NULL) {
ktruio->uio_resid = (int)len - auio.uio_resid;
ktrgenio(uap->sd, UIO_READ, ktruio, error);
}
#endif /* KTRACE */
if (error)
goto out;
td->td_retval[0] = (int)len - auio.uio_resid;
if (fromlen && uap->from) {
len = fromlen;
if (len <= 0 || fromsa == 0)
len = 0;
else {
len = MIN(len, fromsa->sa_len);
error = copyout(fromsa, uap->from, (unsigned)len);
if (error)
goto out;
}
error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
if (error) {
goto out;
}
}
if (uap->msg_flags) {
error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
if (error) {
goto out;
}
}
out:
free(iov, M_IOV);
out1:
fdrop(fp, td);
return (error);
#else /* SCTP */
return (EOPNOTSUPP);
#endif /* SCTP */
}
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