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freebsd-nq/sys/kern/uipc_syscalls.c
Matthew Dillon b1e4abd246 Give struct socket structures a ref counting interface similar to 
vnodes.  This will hopefully serve as a base from which we can
expand the MP code.  We currently do not attempt to obtain any
mutex or SX locks, but the door is open to add them when we nail
down exactly how that part of it is going to work.
2001-11-17 03:07:11 +00:00

1933 lines
41 KiB
C
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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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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
* $FreeBSD$
*/
#include "opt_compat.h"
#include "opt_ktrace.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/lock.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#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>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
static struct sf_buf *sf_buf_alloc(void);
static void sf_buf_free(caddr_t addr, void *args);
static int sendit __P((struct thread *td, int s, struct msghdr *mp, int flags));
static int recvit __P((struct thread *td, int s, struct msghdr *mp,
caddr_t namelenp));
static int accept1 __P((struct thread *td, struct accept_args *uap, int compat));
static int getsockname1 __P((struct thread *td, struct getsockname_args *uap,
int compat));
static int getpeername1 __P((struct thread *td, struct getpeername_args *uap,
int compat));
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static vm_offset_t sf_base;
static struct sf_buf *sf_bufs;
static u_int sf_buf_alloc_want;
/*
* System call interface to the socket abstraction.
*/
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
#define COMPAT_OLDSOCK
#endif
extern struct fileops socketops;
/*
* 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;
mtx_lock(&Giant);
fdp = td->td_proc->p_fd;
error = falloc(td, &fp, &fd);
if (error)
goto done2;
fhold(fp);
error = socreate(uap->domain, &so, uap->type, uap->protocol, td);
if (error) {
if (fdp->fd_ofiles[fd] == fp) {
fdp->fd_ofiles[fd] = NULL;
fdrop(fp, td);
}
} else {
fp->f_data = (caddr_t)so; /* already has ref count */
fp->f_flag = FREAD|FWRITE;
fp->f_ops = &socketops;
fp->f_type = DTYPE_SOCKET;
td->td_retval[0] = fd;
}
fdrop(fp, td);
done2:
mtx_unlock(&Giant);
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;
struct socket *sp;
int error;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &sp, NULL)) != 0)
goto done2;
if ((error = getsockaddr(&sa, uap->name, uap->namelen)) != 0)
goto done1;
error = sobind(sp, sa, td);
FREE(sa, M_SONAME);
done1:
fputsock(sp);
done2:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
listen(td, uap)
struct thread *td;
register struct listen_args /* {
int s;
int backlog;
} */ *uap;
{
struct socket *sp;
int error;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &sp, NULL)) == 0) {
error = solisten(sp, uap->backlog, td);
fputsock(sp);
}
mtx_unlock(&Giant);
return(error);
}
/*
* accept1()
* MPSAFE
*/
static int
accept1(td, uap, compat)
struct thread *td;
register struct accept_args /* {
int s;
caddr_t name;
int *anamelen;
} */ *uap;
int compat;
{
struct filedesc *fdp;
struct file *nfp = NULL;
struct sockaddr *sa;
int namelen, error, s;
struct socket *head, *so;
int fd;
u_int fflag;
mtx_lock(&Giant);
fdp = td->td_proc->p_fd;
if (uap->name) {
error = copyin((caddr_t)uap->anamelen, (caddr_t)&namelen,
sizeof (namelen));
if(error)
goto done2;
}
error = fgetsock(td, uap->s, &head, &fflag);
if (error)
goto done2;
s = splnet();
if ((head->so_options & SO_ACCEPTCONN) == 0) {
splx(s);
error = EINVAL;
goto done;
}
if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) {
splx(s);
error = EWOULDBLOCK;
goto done;
}
while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
if (head->so_state & SS_CANTRCVMORE) {
head->so_error = ECONNABORTED;
break;
}
error = tsleep((caddr_t)&head->so_timeo, PSOCK | PCATCH,
"accept", 0);
if (error) {
splx(s);
goto done;
}
}
if (head->so_error) {
error = head->so_error;
head->so_error = 0;
splx(s);
goto done;
}
/*
* At this point we know that there is at least one connection
* ready to be accepted. Remove it from the queue prior to
* allocating the file descriptor for it since falloc() may
* block allowing another process to accept the connection
* instead.
*/
so = TAILQ_FIRST(&head->so_comp);
TAILQ_REMOVE(&head->so_comp, so, so_list);
head->so_qlen--;
error = falloc(td, &nfp, &fd);
if (error) {
/*
* Probably ran out of file descriptors. Put the
* unaccepted connection back onto the queue and
* do another wakeup so some other process might
* have a chance at it.
*/
TAILQ_INSERT_HEAD(&head->so_comp, so, so_list);
head->so_qlen++;
wakeup_one(&head->so_timeo);
splx(s);
goto done;
}
fhold(nfp);
td->td_retval[0] = fd;
/* connection has been removed from the listen queue */
KNOTE(&head->so_rcv.sb_sel.si_note, 0);
so->so_state &= ~SS_COMP;
so->so_head = NULL;
if (head->so_sigio != NULL)
fsetown(fgetown(head->so_sigio), &so->so_sigio);
soref(so); /* file descriptor reference */
nfp->f_data = (caddr_t)so; /* nfp has ref count from falloc */
nfp->f_flag = fflag;
nfp->f_ops = &socketops;
nfp->f_type = DTYPE_SOCKET;
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 (uap->name != NULL) {
namelen = 0;
(void) copyout((caddr_t)&namelen,
(caddr_t)uap->anamelen, sizeof(*uap->anamelen));
}
goto noconnection;
}
if (sa == NULL) {
namelen = 0;
if (uap->name)
goto gotnoname;
splx(s);
error = 0;
goto done;
}
if (uap->name) {
/* check sa_len before it is destroyed */
if (namelen > sa->sa_len)
namelen = sa->sa_len;
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family =
sa->sa_family;
#endif
error = copyout(sa, (caddr_t)uap->name, (u_int)namelen);
if (!error)
gotnoname:
error = copyout((caddr_t)&namelen,
(caddr_t)uap->anamelen, sizeof (*uap->anamelen));
}
noconnection:
if (sa)
FREE(sa, M_SONAME);
/*
* close the new descriptor, assuming someone hasn't ripped it
* out from under us.
*/
if (error) {
if (fdp->fd_ofiles[fd] == nfp) {
fdp->fd_ofiles[fd] = NULL;
fdrop(nfp, td);
}
}
splx(s);
/*
* Release explicitly held references before returning.
*/
done:
if (nfp != NULL)
fdrop(nfp, td);
fputsock(head);
done2:
mtx_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 socket *so;
struct sockaddr *sa;
int error, s;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &so, NULL)) != 0)
goto done2;
if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
error = EALREADY;
goto done1;
}
error = getsockaddr(&sa, uap->name, uap->namelen);
if (error)
goto done1;
error = soconnect(so, sa, td);
if (error)
goto bad;
if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
FREE(sa, M_SONAME);
error = EINPROGRESS;
goto done1;
}
s = splnet();
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, "connec", 0);
if (error)
break;
}
if (error == 0) {
error = so->so_error;
so->so_error = 0;
}
splx(s);
bad:
so->so_state &= ~SS_ISCONNECTING;
FREE(sa, M_SONAME);
if (error == ERESTART)
error = EINTR;
done1:
fputsock(so);
done2:
mtx_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];
mtx_lock(&Giant);
error = socreate(uap->domain, &so1, uap->type, uap->protocol, td);
if (error)
goto done2;
error = socreate(uap->domain, &so2, uap->type, uap->protocol, td);
if (error)
goto free1;
error = falloc(td, &fp1, &fd);
if (error)
goto free2;
fhold(fp1);
sv[0] = fd;
fp1->f_data = (caddr_t)so1; /* so1 already has ref count */
error = falloc(td, &fp2, &fd);
if (error)
goto free3;
fhold(fp2);
fp2->f_data = (caddr_t)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;
}
fp1->f_flag = fp2->f_flag = FREAD|FWRITE;
fp1->f_ops = fp2->f_ops = &socketops;
fp1->f_type = fp2->f_type = DTYPE_SOCKET;
error = copyout((caddr_t)sv, (caddr_t)uap->rsv, 2 * sizeof (int));
fdrop(fp1, td);
fdrop(fp2, td);
goto done2;
free4:
if (fdp->fd_ofiles[sv[1]] == fp2) {
fdp->fd_ofiles[sv[1]] = NULL;
fdrop(fp2, td);
}
fdrop(fp2, td);
free3:
if (fdp->fd_ofiles[sv[0]] == fp1) {
fdp->fd_ofiles[sv[0]] = NULL;
fdrop(fp1, td);
}
fdrop(fp1, td);
free2:
(void)soclose(so2);
free1:
(void)soclose(so1);
done2:
mtx_unlock(&Giant);
return (error);
}
static int
sendit(td, s, mp, flags)
register struct thread *td;
int s;
register struct msghdr *mp;
int flags;
{
struct uio auio;
register struct iovec *iov;
register int i;
struct mbuf *control;
struct sockaddr *to = NULL;
int len, error;
struct socket *so;
#ifdef KTRACE
struct iovec *ktriov = NULL;
struct uio ktruio;
#endif
if ((error = fgetsock(td, s, &so, NULL)) != 0)
return (error);
auio.uio_iov = mp->msg_iov;
auio.uio_iovcnt = mp->msg_iovlen;
auio.uio_segflg = UIO_USERSPACE;
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;
}
}
if (mp->msg_name) {
error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
if (error)
goto bad;
}
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 = 0;
}
#ifdef KTRACE
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
int iovlen = auio.uio_iovcnt * sizeof (struct iovec);
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
ktruio = auio;
}
#endif
len = auio.uio_resid;
error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio, 0, control,
flags, td);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
if (error == EPIPE) {
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 (ktriov != NULL) {
if (error == 0) {
ktruio.uio_iov = ktriov;
ktruio.uio_resid = td->td_retval[0];
ktrgenio(td->td_proc->p_tracep, s, UIO_WRITE, &ktruio, error);
}
FREE(ktriov, M_TEMP);
}
#endif
bad:
fputsock(so);
if (to)
FREE(to, M_SONAME);
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;
mtx_lock(&Giant);
error = sendit(td, uap->s, &msg, uap->flags);
mtx_unlock(&Giant);
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;
mtx_lock(&Giant);
error = sendit(td, uap->s, &msg, uap->flags);
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
osendmsg(td, uap)
struct thread *td;
register struct osendmsg_args /* {
int s;
caddr_t msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov[UIO_SMALLIOV], *iov;
int error;
mtx_lock(&Giant);
error = copyin(uap->msg, (caddr_t)&msg, sizeof (struct omsghdr));
if (error)
goto done2;
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) {
error = EMSGSIZE;
goto done2;
}
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
M_WAITOK);
} else {
iov = aiov;
}
error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov,
(unsigned)(msg.msg_iovlen * sizeof (struct iovec)));
if (error)
goto done;
msg.msg_flags = MSG_COMPAT;
msg.msg_iov = iov;
error = sendit(td, uap->s, &msg, uap->flags);
done:
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}
#endif
/*
* MPSAFE
*/
int
sendmsg(td, uap)
struct thread *td;
register struct sendmsg_args /* {
int s;
caddr_t msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov[UIO_SMALLIOV], *iov;
int error;
mtx_lock(&Giant);
error = copyin(uap->msg, (caddr_t)&msg, sizeof (msg));
if (error)
goto done2;
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) {
error = EMSGSIZE;
goto done2;
}
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
M_WAITOK);
} else {
iov = aiov;
}
if (msg.msg_iovlen &&
(error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov,
(unsigned)(msg.msg_iovlen * sizeof (struct iovec)))))
goto done;
msg.msg_iov = iov;
#ifdef COMPAT_OLDSOCK
msg.msg_flags = 0;
#endif
error = sendit(td, uap->s, &msg, uap->flags);
done:
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}
static int
recvit(td, s, mp, namelenp)
register struct thread *td;
int s;
register struct msghdr *mp;
caddr_t namelenp;
{
struct uio auio;
register struct iovec *iov;
register int i;
int len, error;
struct mbuf *m, *control = 0;
caddr_t ctlbuf;
struct socket *so;
struct sockaddr *fromsa = 0;
#ifdef KTRACE
struct iovec *ktriov = NULL;
struct uio ktruio;
#endif
if ((error = fgetsock(td, s, &so, NULL)) != 0)
return (error);
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) {
fputsock(so);
return (EINVAL);
}
}
#ifdef KTRACE
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
int iovlen = auio.uio_iovcnt * sizeof (struct iovec);
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
ktruio = auio;
}
#endif
len = auio.uio_resid;
error = so->so_proto->pr_usrreqs->pru_soreceive(so, &fromsa, &auio,
(struct mbuf **)0, mp->msg_control ? &control : (struct mbuf **)0,
&mp->msg_flags);
if (error) {
if (auio.uio_resid != len && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
}
#ifdef KTRACE
if (ktriov != NULL) {
if (error == 0) {
ktruio.uio_iov = ktriov;
ktruio.uio_resid = len - auio.uio_resid;
ktrgenio(td->td_proc->p_tracep, s, UIO_READ, &ktruio, error);
}
FREE(ktriov, M_TEMP);
}
#endif
if (error)
goto out;
td->td_retval[0] = len - auio.uio_resid;
if (mp->msg_name) {
len = mp->msg_namelen;
if (len <= 0 || fromsa == 0)
len = 0;
else {
#ifndef MIN
#define MIN(a,b) ((a)>(b)?(b):(a))
#endif
/* 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
error = copyout(fromsa,
(caddr_t)mp->msg_name, (unsigned)len);
if (error)
goto out;
}
mp->msg_namelen = len;
if (namelenp &&
(error = copyout((caddr_t)&len, namelenp, sizeof (int)))) {
#ifdef COMPAT_OLDSOCK
if (mp->msg_flags & MSG_COMPAT)
error = 0; /* old recvfrom didn't check */
else
#endif
goto out;
}
}
if (mp->msg_control) {
#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 = (caddr_t) 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((caddr_t)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:
fputsock(so);
if (fromsa)
FREE(fromsa, M_SONAME);
if (control)
m_freem(control);
return (error);
}
/*
* MPSAFE
*/
int
recvfrom(td, uap)
struct thread *td;
register struct recvfrom_args /* {
int s;
caddr_t buf;
size_t len;
int flags;
caddr_t from;
int *fromlenaddr;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov;
int error;
mtx_lock(&Giant);
if (uap->fromlenaddr) {
error = copyin((caddr_t)uap->fromlenaddr,
(caddr_t)&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, (caddr_t)uap->fromlenaddr);
done2:
mtx_unlock(&Giant);
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;
mtx_lock(&Giant);
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, (caddr_t)0);
mtx_unlock(&Giant);
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;
register struct orecvmsg_args /* {
int s;
struct omsghdr *msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov[UIO_SMALLIOV], *iov;
int error;
error = copyin((caddr_t)uap->msg, (caddr_t)&msg,
sizeof (struct omsghdr));
if (error)
return (error);
mtx_lock(&Giant);
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) {
error = EMSGSIZE;
goto done2;
}
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
M_WAITOK);
} else {
iov = aiov;
}
msg.msg_flags = uap->flags | MSG_COMPAT;
error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov,
(unsigned)(msg.msg_iovlen * sizeof (struct iovec)));
if (error)
goto done;
msg.msg_iov = iov;
error = recvit(td, uap->s, &msg, (caddr_t)&uap->msg->msg_namelen);
if (msg.msg_controllen && error == 0)
error = copyout((caddr_t)&msg.msg_controllen,
(caddr_t)&uap->msg->msg_accrightslen, sizeof (int));
done:
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}
#endif
/*
* MPSAFE
*/
int
recvmsg(td, uap)
struct thread *td;
register struct recvmsg_args /* {
int s;
struct msghdr *msg;
int flags;
} */ *uap;
{
struct msghdr msg;
struct iovec aiov[UIO_SMALLIOV], *uiov, *iov;
register int error;
mtx_lock(&Giant);
error = copyin((caddr_t)uap->msg, (caddr_t)&msg, sizeof (msg));
if (error)
goto done2;
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) {
error = EMSGSIZE;
goto done2;
}
MALLOC(iov, struct iovec *,
sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
M_WAITOK);
} else {
iov = aiov;
}
#ifdef COMPAT_OLDSOCK
msg.msg_flags = uap->flags &~ MSG_COMPAT;
#else
msg.msg_flags = uap->flags;
#endif
uiov = msg.msg_iov;
msg.msg_iov = iov;
error = copyin((caddr_t)uiov, (caddr_t)iov,
(unsigned)(msg.msg_iovlen * sizeof (struct iovec)));
if (error)
goto done;
error = recvit(td, uap->s, &msg, (caddr_t)0);
if (!error) {
msg.msg_iov = uiov;
error = copyout((caddr_t)&msg, (caddr_t)uap->msg, sizeof(msg));
}
done:
if (iov != aiov)
FREE(iov, M_IOV);
done2:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
shutdown(td, uap)
struct thread *td;
register struct shutdown_args /* {
int s;
int how;
} */ *uap;
{
struct socket *so;
int error;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &so, NULL)) == 0) {
error = soshutdown(so, uap->how);
fputsock(so);
}
mtx_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;
{
struct socket *so;
struct sockopt sopt;
int error;
if (uap->val == 0 && uap->valsize != 0)
return (EFAULT);
if (uap->valsize < 0)
return (EINVAL);
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &so, NULL)) == 0) {
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = uap->level;
sopt.sopt_name = uap->name;
sopt.sopt_val = uap->val;
sopt.sopt_valsize = uap->valsize;
sopt.sopt_td = td;
error = sosetopt(so, &sopt);
fputsock(so);
}
mtx_unlock(&Giant);
return(error);
}
/*
* MPSAFE
*/
/* ARGSUSED */
int
getsockopt(td, uap)
struct thread *td;
register struct getsockopt_args /* {
int s;
int level;
int name;
caddr_t val;
int *avalsize;
} */ *uap;
{
int valsize, error;
struct socket *so;
struct sockopt sopt;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->s, &so, NULL)) != 0)
goto done2;
if (uap->val) {
error = copyin((caddr_t)uap->avalsize, (caddr_t)&valsize,
sizeof (valsize));
if (error)
goto done1;
if (valsize < 0) {
error = EINVAL;
goto done1;
}
} else {
valsize = 0;
}
sopt.sopt_dir = SOPT_GET;
sopt.sopt_level = uap->level;
sopt.sopt_name = uap->name;
sopt.sopt_val = uap->val;
sopt.sopt_valsize = (size_t)valsize; /* checked non-negative above */
sopt.sopt_td = td;
error = sogetopt(so, &sopt);
if (error == 0) {
valsize = sopt.sopt_valsize;
error = copyout((caddr_t)&valsize,
(caddr_t)uap->avalsize, sizeof (valsize));
}
done1:
fputsock(so);
done2:
mtx_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;
caddr_t asa;
int *alen;
} */ *uap;
int compat;
{
struct socket *so;
struct sockaddr *sa;
int len, error;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->fdes, &so, NULL)) != 0)
goto done2;
error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len));
if (error)
goto done1;
sa = 0;
error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa);
if (error)
goto bad;
if (sa == 0) {
len = 0;
goto gotnothing;
}
len = MIN(len, sa->sa_len);
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family = sa->sa_family;
#endif
error = copyout(sa, (caddr_t)uap->asa, (u_int)len);
if (error == 0)
gotnothing:
error = copyout((caddr_t)&len, (caddr_t)uap->alen,
sizeof (len));
bad:
if (sa)
FREE(sa, M_SONAME);
done1:
fputsock(so);
done2:
mtx_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;
caddr_t asa;
int *alen;
} */ *uap;
int compat;
{
struct socket *so;
struct sockaddr *sa;
int len, error;
mtx_lock(&Giant);
if ((error = fgetsock(td, uap->fdes, &so, NULL)) != 0)
goto done2;
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
error = ENOTCONN;
goto done1;
}
error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len));
if (error)
goto done1;
sa = 0;
error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, &sa);
if (error)
goto bad;
if (sa == 0) {
len = 0;
goto gotnothing;
}
len = MIN(len, sa->sa_len);
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family =
sa->sa_family;
#endif
error = copyout(sa, (caddr_t)uap->asa, (u_int)len);
if (error)
goto bad;
gotnothing:
error = copyout((caddr_t)&len, (caddr_t)uap->alen, sizeof (len));
bad:
if (sa)
FREE(sa, M_SONAME);
done1:
fputsock(so);
done2:
mtx_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
return (EINVAL);
}
m = m_get(M_TRYWAIT, type);
if (m == NULL)
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;
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;
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
* XXX - The sf_buf functions are currently private to sendfile(2), so have
* been made static, but may be useful in the future for doing zero-copy in
* other parts of the networking code.
*/
static void
sf_buf_init(void *arg)
{
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_pageable(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
static struct sf_buf *
sf_buf_alloc()
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL)
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
#define dtosf(x) (&sf_bufs[((uintptr_t)(x) - (uintptr_t)sf_base) >> PAGE_SHIFT])
/*
* Detatch mapped page and release resources back to the system.
*/
static void
sf_buf_free(caddr_t addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
GIANT_REQUIRED;
sf = dtosf(addr);
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
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);
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* 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)
{
struct vnode *vp;
struct vm_object *obj;
struct socket *so = NULL;
struct mbuf *m;
struct sf_buf *sf;
struct vm_page *pg;
struct writev_args nuap;
struct sf_hdtr hdtr;
off_t off, xfsize, sbytes = 0;
int error, s;
mtx_lock(&Giant);
/*
* The descriptor must be a regular file and have a backing VM object.
*/
if ((error = fgetvp_read(td, uap->fd, &vp)) != 0)
goto done;
if (vp->v_type != VREG || VOP_GETVOBJECT(vp, &obj) != 0) {
error = EINVAL;
goto done;
}
if ((error = fgetsock(td, uap->s, &so, NULL)) != 0)
goto done;
if (so->so_type != SOCK_STREAM) {
error = EINVAL;
goto done;
}
if ((so->so_state & SS_ISCONNECTED) == 0) {
error = ENOTCONN;
goto done;
}
if (uap->offset < 0) {
error = EINVAL;
goto done;
}
/*
* If specified, get the pointer to the sf_hdtr struct for
* any headers/trailers.
*/
if (uap->hdtr != NULL) {
error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
if (error)
goto done;
/*
* Send any headers. Wimp out and use writev(2).
*/
if (hdtr.headers != NULL) {
nuap.fd = uap->s;
nuap.iovp = hdtr.headers;
nuap.iovcnt = hdtr.hdr_cnt;
error = writev(td, &nuap);
if (error)
goto done;
sbytes += td->td_retval[0];
}
}
/*
* Protect against multiple writers to the socket.
*/
(void) sblock(&so->so_snd, M_WAITOK);
/*
* Loop through the pages in 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.
*/
for (off = uap->offset; ; off += xfsize, sbytes += xfsize) {
vm_pindex_t pindex;
vm_offset_t pgoff;
pindex = OFF_TO_IDX(off);
retry_lookup:
/*
* Calculate the amount to transfer. Not to exceed a page,
* the EOF, or the passed in nbytes.
*/
xfsize = obj->un_pager.vnp.vnp_size - off;
if (xfsize > PAGE_SIZE)
xfsize = PAGE_SIZE;
pgoff = (vm_offset_t)(off & PAGE_MASK);
if (PAGE_SIZE - pgoff < xfsize)
xfsize = PAGE_SIZE - pgoff;
if (uap->nbytes && xfsize > (uap->nbytes - sbytes))
xfsize = uap->nbytes - sbytes;
if (xfsize <= 0)
break;
/*
* Optimize the non-blocking case by looking at the socket space
* before going to the extra work of constituting the sf_buf.
*/
if ((so->so_state & SS_NBIO) && sbspace(&so->so_snd) <= 0) {
if (so->so_state & SS_CANTSENDMORE)
error = EPIPE;
else
error = EAGAIN;
sbunlock(&so->so_snd);
goto done;
}
/*
* Attempt to look up the page.
*
* Allocate if not found
*
* Wait and loop if busy.
*/
pg = vm_page_lookup(obj, pindex);
if (pg == NULL) {
pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL);
if (pg == NULL) {
VM_WAIT;
goto retry_lookup;
}
vm_page_wakeup(pg);
} else if (vm_page_sleep_busy(pg, TRUE, "sfpbsy")) {
goto retry_lookup;
}
/*
* Wire the page so it does not get ripped out from under
* us.
*/
vm_page_wire(pg);
/*
* If page is not valid for what we need, initiate I/O
*/
if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) {
struct uio auio;
struct iovec aiov;
int bsize;
/*
* Ensure that our page is still around when the I/O
* completes.
*/
vm_page_io_start(pg);
/*
* Get the page from backing store.
*/
bsize = vp->v_mount->mnt_stat.f_iosize;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = 0;
aiov.iov_len = MAXBSIZE;
auio.uio_resid = MAXBSIZE;
auio.uio_offset = trunc_page(off);
auio.uio_segflg = UIO_NOCOPY;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, td);
error = VOP_READ(vp, &auio, IO_VMIO | ((MAXBSIZE / bsize) << 16),
td->td_proc->p_ucred);
VOP_UNLOCK(vp, 0, td);
vm_page_flag_clear(pg, PG_ZERO);
vm_page_io_finish(pg);
if (error) {
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->flags & PG_BUSY) &&
pg->hold_count == 0) {
vm_page_busy(pg);
vm_page_free(pg);
}
sbunlock(&so->so_snd);
goto done;
}
}
/*
* Get a sendfile buf. We usually wait as long as necessary,
* but this wait can be interrupted.
*/
if ((sf = sf_buf_alloc()) == NULL) {
vm_page_unwire(pg, 0);
if (pg->wire_count == 0 && pg->object == NULL)
vm_page_free(pg);
sbunlock(&so->so_snd);
error = EINTR;
goto done;
}
/*
* Allocate a kernel virtual page and insert the physical page
* into it.
*/
sf->m = pg;
pmap_qenter(sf->kva, &pg, 1);
/*
* Get an mbuf header and set it up as having external storage.
*/
MGETHDR(m, M_TRYWAIT, MT_DATA);
if (m == NULL) {
error = ENOBUFS;
sf_buf_free((void *)sf->kva, NULL);
sbunlock(&so->so_snd);
goto done;
}
/*
* Setup external storage for mbuf.
*/
MEXTADD(m, sf->kva, PAGE_SIZE, sf_buf_free, NULL, M_RDONLY,
EXT_SFBUF);
m->m_data = (char *) sf->kva + pgoff;
m->m_pkthdr.len = m->m_len = xfsize;
/*
* Add the buffer to the socket buffer chain.
*/
s = splnet();
retry_space:
/*
* Make sure that the socket is still able to take more data.
* CANTSENDMORE being true usually means that the connection
* was closed. so_error is true when an error was sensed after
* a previous send.
* The state is checked after the page mapping and buffer
* allocation above since those operations may block and make
* any socket checks stale. From this point forward, nothing
* blocks before the pru_send (or more accurately, any blocking
* results in a loop back to here to re-check).
*/
if ((so->so_state & SS_CANTSENDMORE) || so->so_error) {
if (so->so_state & SS_CANTSENDMORE) {
error = EPIPE;
} else {
error = so->so_error;
so->so_error = 0;
}
m_freem(m);
sbunlock(&so->so_snd);
splx(s);
goto done;
}
/*
* Wait for socket space to become available. We do this just
* after checking the connection state above in order to avoid
* a race condition with sbwait().
*/
if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) {
if (so->so_state & SS_NBIO) {
m_freem(m);
sbunlock(&so->so_snd);
splx(s);
error = EAGAIN;
goto done;
}
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) {
m_freem(m);
sbunlock(&so->so_snd);
splx(s);
goto done;
}
goto retry_space;
}
error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, 0, 0, td);
splx(s);
if (error) {
sbunlock(&so->so_snd);
goto done;
}
}
sbunlock(&so->so_snd);
/*
* Send trailers. Wimp out and use writev(2).
*/
if (uap->hdtr != NULL && hdtr.trailers != NULL) {
nuap.fd = uap->s;
nuap.iovp = hdtr.trailers;
nuap.iovcnt = hdtr.trl_cnt;
error = writev(td, &nuap);
if (error)
goto done;
sbytes += td->td_retval[0];
}
done:
/*
* 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 (vp)
vrele(vp);
if (so)
fputsock(so);
mtx_unlock(&Giant);
return (error);
}
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