1705 lines
38 KiB
C
1705 lines
38 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* sendfile(2) and related extensions:
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* Copyright (c) 1998, David Greenman. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
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* $Id: uipc_syscalls.c,v 1.48 1998/12/03 12:35:47 dg Exp $
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*/
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#include "opt_compat.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysproto.h>
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#include <sys/malloc.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/signalvar.h>
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#include <sys/uio.h>
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#include <sys/vnode.h>
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#include <sys/lock.h>
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#include <sys/mount.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <machine/limits.h>
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static void sf_buf_init(void *arg);
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SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
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static struct sf_buf *sf_buf_alloc(void);
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static void sf_buf_ref(caddr_t addr, u_int size);
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static void sf_buf_free(caddr_t addr, u_int size);
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static int sendit __P((struct proc *p, int s, struct msghdr *mp, int flags));
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static int recvit __P((struct proc *p, int s, struct msghdr *mp,
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caddr_t namelenp));
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static int accept1 __P((struct proc *p, struct accept_args *uap, int compat));
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static int getsockname1 __P((struct proc *p, struct getsockname_args *uap,
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int compat));
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static int getpeername1 __P((struct proc *p, struct getpeername_args *uap,
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int compat));
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static SLIST_HEAD(, sf_buf) sf_freelist;
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static vm_offset_t sf_base;
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static struct sf_buf *sf_bufs;
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static int sf_buf_alloc_want;
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/*
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* System call interface to the socket abstraction.
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*/
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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#define COMPAT_OLDSOCK
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#endif
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extern struct fileops socketops;
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int
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socket(p, uap)
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struct proc *p;
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register struct socket_args /* {
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int domain;
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int type;
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int protocol;
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} */ *uap;
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{
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struct filedesc *fdp = p->p_fd;
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struct socket *so;
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struct file *fp;
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int fd, error;
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error = falloc(p, &fp, &fd);
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if (error)
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return (error);
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fp->f_flag = FREAD|FWRITE;
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fp->f_type = DTYPE_SOCKET;
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fp->f_ops = &socketops;
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error = socreate(uap->domain, &so, uap->type, uap->protocol, p);
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if (error) {
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fdp->fd_ofiles[fd] = 0;
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ffree(fp);
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} else {
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fp->f_data = (caddr_t)so;
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p->p_retval[0] = fd;
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}
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return (error);
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}
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/* ARGSUSED */
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int
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bind(p, uap)
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struct proc *p;
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register struct bind_args /* {
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int s;
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caddr_t name;
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int namelen;
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} */ *uap;
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{
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struct file *fp;
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struct sockaddr *sa;
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int error;
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error = getsock(p->p_fd, uap->s, &fp);
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if (error)
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return (error);
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error = getsockaddr(&sa, uap->name, uap->namelen);
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if (error)
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return (error);
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error = sobind((struct socket *)fp->f_data, sa, p);
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FREE(sa, M_SONAME);
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return (error);
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}
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/* ARGSUSED */
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int
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listen(p, uap)
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struct proc *p;
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register struct listen_args /* {
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int s;
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int backlog;
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} */ *uap;
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{
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struct file *fp;
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int error;
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error = getsock(p->p_fd, uap->s, &fp);
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if (error)
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return (error);
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return (solisten((struct socket *)fp->f_data, uap->backlog, p));
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}
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static int
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accept1(p, uap, compat)
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struct proc *p;
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register struct accept_args /* {
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int s;
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caddr_t name;
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int *anamelen;
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} */ *uap;
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int compat;
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{
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struct file *fp;
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struct sockaddr *sa;
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int namelen, error, s;
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struct socket *head, *so;
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int fd;
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short fflag; /* type must match fp->f_flag */
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if (uap->name) {
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error = copyin((caddr_t)uap->anamelen, (caddr_t)&namelen,
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sizeof (namelen));
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if(error)
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return (error);
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}
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error = getsock(p->p_fd, uap->s, &fp);
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if (error)
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return (error);
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s = splnet();
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head = (struct socket *)fp->f_data;
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if ((head->so_options & SO_ACCEPTCONN) == 0) {
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splx(s);
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return (EINVAL);
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}
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if ((head->so_state & SS_NBIO) && head->so_comp.tqh_first == NULL) {
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splx(s);
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return (EWOULDBLOCK);
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}
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while (head->so_comp.tqh_first == NULL && head->so_error == 0) {
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if (head->so_state & SS_CANTRCVMORE) {
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head->so_error = ECONNABORTED;
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break;
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}
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error = tsleep((caddr_t)&head->so_timeo, PSOCK | PCATCH,
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"accept", 0);
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if (error) {
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splx(s);
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return (error);
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}
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}
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if (head->so_error) {
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error = head->so_error;
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head->so_error = 0;
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splx(s);
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return (error);
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}
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/*
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* At this point we know that there is at least one connection
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* ready to be accepted. Remove it from the queue prior to
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* allocating the file descriptor for it since falloc() may
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* block allowing another process to accept the connection
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* instead.
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*/
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so = head->so_comp.tqh_first;
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TAILQ_REMOVE(&head->so_comp, so, so_list);
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head->so_qlen--;
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fflag = fp->f_flag;
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error = falloc(p, &fp, &fd);
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if (error) {
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/*
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* Probably ran out of file descriptors. Put the
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* unaccepted connection back onto the queue and
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* do another wakeup so some other process might
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* have a chance at it.
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*/
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TAILQ_INSERT_HEAD(&head->so_comp, so, so_list);
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head->so_qlen++;
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wakeup_one(&head->so_timeo);
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splx(s);
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return (error);
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} else
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p->p_retval[0] = fd;
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so->so_state &= ~SS_COMP;
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so->so_head = NULL;
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if (head->so_sigio != NULL)
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fsetown(fgetown(head->so_sigio), &so->so_sigio);
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fp->f_type = DTYPE_SOCKET;
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fp->f_flag = fflag;
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fp->f_ops = &socketops;
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fp->f_data = (caddr_t)so;
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sa = 0;
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(void) soaccept(so, &sa);
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if (sa == 0) {
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namelen = 0;
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if (uap->name)
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goto gotnoname;
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return 0;
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}
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if (uap->name) {
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/* check sa_len before it is destroyed */
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if (namelen > sa->sa_len)
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namelen = sa->sa_len;
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#ifdef COMPAT_OLDSOCK
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if (compat)
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((struct osockaddr *)sa)->sa_family =
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sa->sa_family;
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#endif
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error = copyout(sa, (caddr_t)uap->name, (u_int)namelen);
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if (!error)
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gotnoname:
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error = copyout((caddr_t)&namelen,
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(caddr_t)uap->anamelen, sizeof (*uap->anamelen));
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}
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FREE(sa, M_SONAME);
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splx(s);
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return (error);
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}
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int
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accept(p, uap)
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struct proc *p;
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struct accept_args *uap;
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{
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return (accept1(p, uap, 0));
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}
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#ifdef COMPAT_OLDSOCK
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int
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oaccept(p, uap)
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struct proc *p;
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struct accept_args *uap;
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{
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return (accept1(p, uap, 1));
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}
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#endif /* COMPAT_OLDSOCK */
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/* ARGSUSED */
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int
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connect(p, uap)
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struct proc *p;
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register struct connect_args /* {
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int s;
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caddr_t name;
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int namelen;
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} */ *uap;
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{
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struct file *fp;
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register struct socket *so;
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struct sockaddr *sa;
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int error, s;
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error = getsock(p->p_fd, uap->s, &fp);
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if (error)
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return (error);
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so = (struct socket *)fp->f_data;
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if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING))
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return (EALREADY);
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error = getsockaddr(&sa, uap->name, uap->namelen);
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if (error)
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return (error);
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error = soconnect(so, sa, p);
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if (error)
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goto bad;
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if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
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FREE(sa, M_SONAME);
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return (EINPROGRESS);
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}
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s = splnet();
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while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
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error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH,
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"connec", 0);
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if (error)
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break;
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}
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if (error == 0) {
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error = so->so_error;
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so->so_error = 0;
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}
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splx(s);
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bad:
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so->so_state &= ~SS_ISCONNECTING;
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FREE(sa, M_SONAME);
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if (error == ERESTART)
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error = EINTR;
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return (error);
|
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}
|
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|
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int
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socketpair(p, uap)
|
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struct proc *p;
|
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register struct socketpair_args /* {
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int domain;
|
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int type;
|
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int protocol;
|
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int *rsv;
|
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} */ *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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struct file *fp1, *fp2;
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struct socket *so1, *so2;
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int fd, error, sv[2];
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|
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error = socreate(uap->domain, &so1, uap->type, uap->protocol, p);
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if (error)
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return (error);
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error = socreate(uap->domain, &so2, uap->type, uap->protocol, p);
|
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if (error)
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goto free1;
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error = falloc(p, &fp1, &fd);
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if (error)
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goto free2;
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sv[0] = fd;
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fp1->f_flag = FREAD|FWRITE;
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fp1->f_type = DTYPE_SOCKET;
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fp1->f_ops = &socketops;
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fp1->f_data = (caddr_t)so1;
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error = falloc(p, &fp2, &fd);
|
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if (error)
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goto free3;
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fp2->f_flag = FREAD|FWRITE;
|
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fp2->f_type = DTYPE_SOCKET;
|
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fp2->f_ops = &socketops;
|
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fp2->f_data = (caddr_t)so2;
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sv[1] = fd;
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error = soconnect2(so1, so2);
|
|
if (error)
|
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goto free4;
|
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if (uap->type == SOCK_DGRAM) {
|
|
/*
|
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* Datagram socket connection is asymmetric.
|
|
*/
|
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error = soconnect2(so2, so1);
|
|
if (error)
|
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goto free4;
|
|
}
|
|
error = copyout((caddr_t)sv, (caddr_t)uap->rsv, 2 * sizeof (int));
|
|
return (error);
|
|
free4:
|
|
ffree(fp2);
|
|
fdp->fd_ofiles[sv[1]] = 0;
|
|
free3:
|
|
ffree(fp1);
|
|
fdp->fd_ofiles[sv[0]] = 0;
|
|
free2:
|
|
(void)soclose(so2);
|
|
free1:
|
|
(void)soclose(so1);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sendit(p, s, mp, flags)
|
|
register struct proc *p;
|
|
int s;
|
|
register struct msghdr *mp;
|
|
int flags;
|
|
{
|
|
struct file *fp;
|
|
struct uio auio;
|
|
register struct iovec *iov;
|
|
register int i;
|
|
struct mbuf *control;
|
|
struct sockaddr *to;
|
|
int len, error;
|
|
struct socket *so;
|
|
#ifdef KTRACE
|
|
struct iovec *ktriov = NULL;
|
|
#endif
|
|
|
|
error = getsock(p->p_fd, s, &fp);
|
|
if (error)
|
|
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_procp = p;
|
|
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)
|
|
return (EINVAL);
|
|
}
|
|
if (mp->msg_name) {
|
|
error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
|
|
if (error)
|
|
return (error);
|
|
} else
|
|
to = 0;
|
|
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_WAIT);
|
|
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(p, 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);
|
|
}
|
|
#endif
|
|
len = auio.uio_resid;
|
|
so = (struct socket *)fp->f_data;
|
|
error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio, 0, control,
|
|
flags, p);
|
|
if (error) {
|
|
if (auio.uio_resid != len && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
if (error == EPIPE)
|
|
psignal(p, SIGPIPE);
|
|
}
|
|
if (error == 0)
|
|
p->p_retval[0] = len - auio.uio_resid;
|
|
#ifdef KTRACE
|
|
if (ktriov != NULL) {
|
|
if (error == 0)
|
|
ktrgenio(p->p_tracep, s, UIO_WRITE,
|
|
ktriov, p->p_retval[0], error);
|
|
FREE(ktriov, M_TEMP);
|
|
}
|
|
#endif
|
|
bad:
|
|
if (to)
|
|
FREE(to, M_SONAME);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sendto(p, uap)
|
|
struct proc *p;
|
|
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;
|
|
|
|
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;
|
|
return (sendit(p, uap->s, &msg, uap->flags));
|
|
}
|
|
|
|
#ifdef COMPAT_OLDSOCK
|
|
int
|
|
osend(p, uap)
|
|
struct proc *p;
|
|
register struct osend_args /* {
|
|
int s;
|
|
caddr_t buf;
|
|
int len;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec aiov;
|
|
|
|
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;
|
|
return (sendit(p, uap->s, &msg, uap->flags));
|
|
}
|
|
|
|
int
|
|
osendmsg(p, uap)
|
|
struct proc *p;
|
|
register struct osendmsg_args /* {
|
|
int s;
|
|
caddr_t msg;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec aiov[UIO_SMALLIOV], *iov;
|
|
int error;
|
|
|
|
error = copyin(uap->msg, (caddr_t)&msg, sizeof (struct omsghdr));
|
|
if (error)
|
|
return (error);
|
|
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
|
|
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
|
|
return (EMSGSIZE);
|
|
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(p, uap->s, &msg, uap->flags);
|
|
done:
|
|
if (iov != aiov)
|
|
FREE(iov, M_IOV);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
sendmsg(p, uap)
|
|
struct proc *p;
|
|
register struct sendmsg_args /* {
|
|
int s;
|
|
caddr_t msg;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec aiov[UIO_SMALLIOV], *iov;
|
|
int error;
|
|
|
|
error = copyin(uap->msg, (caddr_t)&msg, sizeof (msg));
|
|
if (error)
|
|
return (error);
|
|
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
|
|
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
|
|
return (EMSGSIZE);
|
|
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(p, uap->s, &msg, uap->flags);
|
|
done:
|
|
if (iov != aiov)
|
|
FREE(iov, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
recvit(p, s, mp, namelenp)
|
|
register struct proc *p;
|
|
int s;
|
|
register struct msghdr *mp;
|
|
caddr_t namelenp;
|
|
{
|
|
struct file *fp;
|
|
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;
|
|
#endif
|
|
|
|
error = getsock(p->p_fd, s, &fp);
|
|
if (error)
|
|
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_procp = p;
|
|
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)
|
|
return (EINVAL);
|
|
}
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, 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);
|
|
}
|
|
#endif
|
|
len = auio.uio_resid;
|
|
so = (struct socket *)fp->f_data;
|
|
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)
|
|
ktrgenio(p->p_tracep, s, UIO_READ,
|
|
ktriov, len - auio.uio_resid, error);
|
|
FREE(ktriov, M_TEMP);
|
|
}
|
|
#endif
|
|
if (error)
|
|
goto out;
|
|
p->p_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))
|
|
goto out;
|
|
|
|
ctlbuf += tocopy;
|
|
len -= tocopy;
|
|
m = m->m_next;
|
|
}
|
|
mp->msg_controllen = ctlbuf - mp->msg_control;
|
|
}
|
|
out:
|
|
if (fromsa)
|
|
FREE(fromsa, M_SONAME);
|
|
if (control)
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
recvfrom(p, uap)
|
|
struct proc *p;
|
|
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;
|
|
|
|
if (uap->fromlenaddr) {
|
|
error = copyin((caddr_t)uap->fromlenaddr,
|
|
(caddr_t)&msg.msg_namelen, sizeof (msg.msg_namelen));
|
|
if (error)
|
|
return (error);
|
|
} 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;
|
|
return (recvit(p, uap->s, &msg, (caddr_t)uap->fromlenaddr));
|
|
}
|
|
|
|
#ifdef COMPAT_OLDSOCK
|
|
int
|
|
orecvfrom(p, uap)
|
|
struct proc *p;
|
|
struct recvfrom_args *uap;
|
|
{
|
|
|
|
uap->flags |= MSG_COMPAT;
|
|
return (recvfrom(p, uap));
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef COMPAT_OLDSOCK
|
|
int
|
|
orecv(p, uap)
|
|
struct proc *p;
|
|
register struct orecv_args /* {
|
|
int s;
|
|
caddr_t buf;
|
|
int len;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec aiov;
|
|
|
|
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;
|
|
return (recvit(p, uap->s, &msg, (caddr_t)0));
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int
|
|
orecvmsg(p, uap)
|
|
struct proc *p;
|
|
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);
|
|
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
|
|
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
|
|
return (EMSGSIZE);
|
|
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(p, 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);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
recvmsg(p, uap)
|
|
struct proc *p;
|
|
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;
|
|
|
|
error = copyin((caddr_t)uap->msg, (caddr_t)&msg, sizeof (msg));
|
|
if (error)
|
|
return (error);
|
|
if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
|
|
if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
|
|
return (EMSGSIZE);
|
|
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(p, 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);
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
shutdown(p, uap)
|
|
struct proc *p;
|
|
register struct shutdown_args /* {
|
|
int s;
|
|
int how;
|
|
} */ *uap;
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
error = getsock(p->p_fd, uap->s, &fp);
|
|
if (error)
|
|
return (error);
|
|
return (soshutdown((struct socket *)fp->f_data, uap->how));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
setsockopt(p, uap)
|
|
struct proc *p;
|
|
register struct setsockopt_args /* {
|
|
int s;
|
|
int level;
|
|
int name;
|
|
caddr_t val;
|
|
int valsize;
|
|
} */ *uap;
|
|
{
|
|
struct file *fp;
|
|
struct sockopt sopt;
|
|
int error;
|
|
|
|
if (uap->val == 0 && uap->valsize != 0)
|
|
return (EFAULT);
|
|
if (uap->valsize < 0)
|
|
return (EINVAL);
|
|
|
|
error = getsock(p->p_fd, uap->s, &fp);
|
|
if (error)
|
|
return (error);
|
|
|
|
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_p = p;
|
|
|
|
return (sosetopt((struct socket *)fp->f_data, &sopt));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
getsockopt(p, uap)
|
|
struct proc *p;
|
|
register struct getsockopt_args /* {
|
|
int s;
|
|
int level;
|
|
int name;
|
|
caddr_t val;
|
|
int *avalsize;
|
|
} */ *uap;
|
|
{
|
|
int valsize, error;
|
|
struct file *fp;
|
|
struct sockopt sopt;
|
|
|
|
error = getsock(p->p_fd, uap->s, &fp);
|
|
if (error)
|
|
return (error);
|
|
if (uap->val) {
|
|
error = copyin((caddr_t)uap->avalsize, (caddr_t)&valsize,
|
|
sizeof (valsize));
|
|
if (error)
|
|
return (error);
|
|
if (valsize < 0)
|
|
return (EINVAL);
|
|
} 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_p = p;
|
|
|
|
error = sogetopt((struct socket *)fp->f_data, &sopt);
|
|
if (error == 0) {
|
|
valsize = sopt.sopt_valsize;
|
|
error = copyout((caddr_t)&valsize,
|
|
(caddr_t)uap->avalsize, sizeof (valsize));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Get socket name.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
getsockname1(p, uap, compat)
|
|
struct proc *p;
|
|
register struct getsockname_args /* {
|
|
int fdes;
|
|
caddr_t asa;
|
|
int *alen;
|
|
} */ *uap;
|
|
int compat;
|
|
{
|
|
struct file *fp;
|
|
register struct socket *so;
|
|
struct sockaddr *sa;
|
|
int len, error;
|
|
|
|
error = getsock(p->p_fd, uap->fdes, &fp);
|
|
if (error)
|
|
return (error);
|
|
error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len));
|
|
if (error)
|
|
return (error);
|
|
so = (struct socket *)fp->f_data;
|
|
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);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
getsockname(p, uap)
|
|
struct proc *p;
|
|
struct getsockname_args *uap;
|
|
{
|
|
|
|
return (getsockname1(p, uap, 0));
|
|
}
|
|
|
|
#ifdef COMPAT_OLDSOCK
|
|
int
|
|
ogetsockname(p, uap)
|
|
struct proc *p;
|
|
struct getsockname_args *uap;
|
|
{
|
|
|
|
return (getsockname1(p, uap, 1));
|
|
}
|
|
#endif /* COMPAT_OLDSOCK */
|
|
|
|
/*
|
|
* Get name of peer for connected socket.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
getpeername1(p, uap, compat)
|
|
struct proc *p;
|
|
register struct getpeername_args /* {
|
|
int fdes;
|
|
caddr_t asa;
|
|
int *alen;
|
|
} */ *uap;
|
|
int compat;
|
|
{
|
|
struct file *fp;
|
|
register struct socket *so;
|
|
struct sockaddr *sa;
|
|
int len, error;
|
|
|
|
error = getsock(p->p_fd, uap->fdes, &fp);
|
|
if (error)
|
|
return (error);
|
|
so = (struct socket *)fp->f_data;
|
|
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
|
|
return (ENOTCONN);
|
|
error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len));
|
|
if (error)
|
|
return (error);
|
|
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);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
getpeername(p, uap)
|
|
struct proc *p;
|
|
struct getpeername_args *uap;
|
|
{
|
|
|
|
return (getpeername1(p, uap, 0));
|
|
}
|
|
|
|
#ifdef COMPAT_OLDSOCK
|
|
int
|
|
ogetpeername(p, uap)
|
|
struct proc *p;
|
|
struct ogetpeername_args *uap;
|
|
{
|
|
|
|
/* XXX uap should have type `getpeername_args *' to begin with. */
|
|
return (getpeername1(p, (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_WAIT, 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;
|
|
}
|
|
|
|
int
|
|
getsock(fdp, fdes, fpp)
|
|
struct filedesc *fdp;
|
|
int fdes;
|
|
struct file **fpp;
|
|
{
|
|
register struct file *fp;
|
|
|
|
if ((unsigned)fdes >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fdes]) == NULL)
|
|
return (EBADF);
|
|
if (fp->f_type != DTYPE_SOCKET)
|
|
return (ENOTSOCK);
|
|
*fpp = fp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
SLIST_INIT(&sf_freelist);
|
|
sf_base = kmem_alloc_pageable(kernel_map, nsfbufs * PAGE_SIZE);
|
|
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, M_NOWAIT);
|
|
bzero(sf_bufs, nsfbufs * sizeof(struct sf_buf));
|
|
for (i = 0; i < nsfbufs; i++) {
|
|
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
|
|
SLIST_INSERT_HEAD(&sf_freelist, &sf_bufs[i], free_list);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 s;
|
|
|
|
s = splimp();
|
|
while ((sf = SLIST_FIRST(&sf_freelist)) == NULL) {
|
|
sf_buf_alloc_want = 1;
|
|
tsleep(&sf_freelist, PVM, "sfbufa", 0);
|
|
}
|
|
SLIST_REMOVE_HEAD(&sf_freelist, free_list);
|
|
splx(s);
|
|
sf->refcnt = 1;
|
|
return (sf);
|
|
}
|
|
|
|
#define dtosf(x) (&sf_bufs[((uintptr_t)(x) - (uintptr_t)sf_base) >> PAGE_SHIFT])
|
|
static void
|
|
sf_buf_ref(caddr_t addr, u_int size)
|
|
{
|
|
struct sf_buf *sf;
|
|
|
|
sf = dtosf(addr);
|
|
if (sf->refcnt == 0)
|
|
panic("sf_buf_ref: referencing a free sf_buf");
|
|
sf->refcnt++;
|
|
}
|
|
|
|
/*
|
|
* Lose a reference to an sf_buf. When none left, detach mapped page
|
|
* and release resources back to the system.
|
|
*
|
|
* Must be called at splimp.
|
|
*/
|
|
static void
|
|
sf_buf_free(caddr_t addr, u_int size)
|
|
{
|
|
struct sf_buf *sf;
|
|
struct vm_page *m;
|
|
int s;
|
|
|
|
sf = dtosf(addr);
|
|
if (sf->refcnt == 0)
|
|
panic("sf_buf_free: freeing free sf_buf");
|
|
sf->refcnt--;
|
|
if (sf->refcnt == 0) {
|
|
pmap_qremove((vm_offset_t)addr, 1);
|
|
m = sf->m;
|
|
s = splvm();
|
|
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);
|
|
splx(s);
|
|
sf->m = NULL;
|
|
SLIST_INSERT_HEAD(&sf_freelist, sf, free_list);
|
|
if (sf_buf_alloc_want) {
|
|
sf_buf_alloc_want = 0;
|
|
wakeup(&sf_freelist);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* sendfile(2).
|
|
* 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 proc *p, struct sendfile_args *uap)
|
|
{
|
|
struct file *fp;
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct vnode *vp;
|
|
struct vm_object *obj;
|
|
struct socket *so;
|
|
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 = 0, s;
|
|
|
|
/*
|
|
* Do argument checking. Must be a regular file in, stream
|
|
* type and connected socket out, positive offset.
|
|
*/
|
|
if (((u_int)uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
|
|
(fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
goto done;
|
|
}
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
obj = vp->v_object;
|
|
if (vp->v_type != VREG || obj == NULL) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
error = getsock(p->p_fd, uap->s, &fp);
|
|
if (error)
|
|
goto done;
|
|
so = (struct socket *)fp->f_data;
|
|
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(p, &nuap);
|
|
if (error)
|
|
goto done;
|
|
sbytes += p->p_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. If the page doesn't exist or the
|
|
* part we're interested in isn't valid, then read it from disk.
|
|
* If some other part of the kernel has this page (i.e. it's busy),
|
|
* then disk I/O may be occuring on it, so wait and retry.
|
|
*/
|
|
pg = vm_page_lookup(obj, pindex);
|
|
if (pg == NULL || (!(pg->flags & PG_BUSY) && !pg->busy &&
|
|
!vm_page_is_valid(pg, pgoff, xfsize))) {
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int bsize;
|
|
|
|
if (pg == NULL) {
|
|
pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL);
|
|
if (pg == NULL) {
|
|
VM_WAIT;
|
|
goto retry_lookup;
|
|
}
|
|
vm_page_flag_clear(pg, PG_BUSY);
|
|
}
|
|
/*
|
|
* Ensure that our page is still around when the I/O completes.
|
|
*/
|
|
vm_page_io_start(pg);
|
|
vm_page_wire(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_procp = p;
|
|
vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, p);
|
|
error = VOP_READ(vp, &auio, IO_VMIO | ((MAXBSIZE / bsize) << 16),
|
|
p->p_ucred);
|
|
VOP_UNLOCK(vp, 0, p);
|
|
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_free(pg);
|
|
sbunlock(&so->so_snd);
|
|
goto done;
|
|
}
|
|
} else {
|
|
if ((pg->flags & PG_BUSY) || pg->busy) {
|
|
s = splvm();
|
|
if ((pg->flags & PG_BUSY) || pg->busy) {
|
|
/*
|
|
* Page is busy. Wait and retry.
|
|
*/
|
|
vm_page_flag_set(pg, PG_WANTED);
|
|
tsleep(pg, PVM, "sfpbsy", 0);
|
|
splx(s);
|
|
goto retry_lookup;
|
|
}
|
|
splx(s);
|
|
}
|
|
/*
|
|
* Protect from having the page ripped out from beneath us.
|
|
*/
|
|
vm_page_wire(pg);
|
|
}
|
|
/*
|
|
* Allocate a kernel virtual page and insert the physical page
|
|
* into it.
|
|
*/
|
|
sf = sf_buf_alloc();
|
|
sf->m = pg;
|
|
pmap_qenter(sf->kva, &pg, 1);
|
|
/*
|
|
* Get an mbuf header and set it up as having external storage.
|
|
*/
|
|
MGETHDR(m, M_WAIT, MT_DATA);
|
|
m->m_ext.ext_free = sf_buf_free;
|
|
m->m_ext.ext_ref = sf_buf_ref;
|
|
m->m_ext.ext_buf = (void *)sf->kva;
|
|
m->m_ext.ext_size = PAGE_SIZE;
|
|
m->m_data = (char *) sf->kva + pgoff;
|
|
m->m_flags |= M_EXT;
|
|
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, p);
|
|
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(p, &nuap);
|
|
if (error)
|
|
goto done;
|
|
sbytes += p->p_retval[0];
|
|
}
|
|
|
|
done:
|
|
if (uap->sbytes != NULL) {
|
|
copyout(&sbytes, uap->sbytes, sizeof(off_t));
|
|
}
|
|
return (error);
|
|
}
|