485 lines
13 KiB
C
485 lines
13 KiB
C
/*
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* Copyright (c) 2000-2013 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. 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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* @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
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* support for mandatory and extensible security protections. This notice
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* is included in support of clause 2.2 (b) of the Apple Public License,
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* Version 2.0.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/file_internal.h>
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#include <sys/event.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/filio.h> /* XXX */
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#include <sys/sockio.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/filedesc.h>
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#include <sys/kauth.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <net/if.h>
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#include <net/route.h>
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#if CONFIG_MACF
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#include <security/mac_framework.h>
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#endif
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/*
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* File operations on sockets.
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*/
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static int soo_read(struct fileproc *, struct uio *, int, vfs_context_t ctx);
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static int soo_write(struct fileproc *, struct uio *, int, vfs_context_t ctx);
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static int soo_close(struct fileglob *, vfs_context_t ctx);
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static int soo_drain(struct fileproc *, vfs_context_t ctx);
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const struct fileops socketops = {
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.fo_type = DTYPE_SOCKET,
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.fo_read = soo_read,
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.fo_write = soo_write,
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.fo_ioctl = soo_ioctl,
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.fo_select = soo_select,
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.fo_close = soo_close,
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.fo_drain = soo_drain,
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.fo_kqfilter = soo_kqfilter,
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};
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/* ARGSUSED */
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static int
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soo_read(struct fileproc *fp, struct uio *uio, __unused int flags,
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__unused vfs_context_t ctx)
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{
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struct socket *so;
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int stat;
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int (*fsoreceive)(struct socket *so2, struct sockaddr **paddr,
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struct uio *uio2, struct mbuf **mp0, struct mbuf **controlp,
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int *flagsp);
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if ((so = (struct socket *)fp_get_data(fp)) == NULL) {
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/* This is not a valid open file descriptor */
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return EBADF;
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}
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fsoreceive = so->so_proto->pr_usrreqs->pru_soreceive;
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stat = (*fsoreceive)(so, 0, uio, 0, 0, 0);
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return stat;
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}
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/* ARGSUSED */
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static int
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soo_write(struct fileproc *fp, struct uio *uio, __unused int flags,
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vfs_context_t ctx)
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{
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struct socket *so;
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int stat;
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int (*fsosend)(struct socket *so2, struct sockaddr *addr,
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struct uio *uio2, struct mbuf *top, struct mbuf *control,
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int flags2);
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proc_t procp;
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if ((so = (struct socket *)fp_get_data(fp)) == NULL) {
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/* This is not a valid open file descriptor */
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return EBADF;
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}
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fsosend = so->so_proto->pr_usrreqs->pru_sosend;
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stat = (*fsosend)(so, 0, uio, 0, 0, 0);
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/* Generation of SIGPIPE can be controlled per socket */
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procp = vfs_context_proc(ctx);
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if (stat == EPIPE && !(so->so_flags & SOF_NOSIGPIPE)) {
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psignal(procp, SIGPIPE);
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}
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return stat;
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}
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__private_extern__ int
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soioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
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{
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int error = 0;
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int int_arg;
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#if CONFIG_MACF_SOCKET_SUBSET
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error = mac_socket_check_ioctl(kauth_cred_get(), so, cmd);
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if (error) {
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return error;
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}
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#endif
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socket_lock(so, 1);
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/* call the socket filter's ioctl handler anything but ours */
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if (IOCGROUP(cmd) != 'i' && IOCGROUP(cmd) != 'r') {
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switch (cmd) {
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case SIOCGASSOCIDS32:
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case SIOCGASSOCIDS64:
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case SIOCGCONNIDS32:
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case SIOCGCONNIDS64:
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case SIOCGCONNINFO32:
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case SIOCGCONNINFO64:
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case SIOCSCONNORDER:
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case SIOCGCONNORDER:
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/* don't pass to filter */
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break;
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default:
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error = sflt_ioctl(so, cmd, data);
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if (error != 0) {
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goto out;
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}
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break;
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}
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}
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switch (cmd) {
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case FIONBIO: /* int */
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bcopy(data, &int_arg, sizeof(int_arg));
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if (int_arg) {
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so->so_state |= SS_NBIO;
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} else {
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so->so_state &= ~SS_NBIO;
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}
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goto out;
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case FIOASYNC: /* int */
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bcopy(data, &int_arg, sizeof(int_arg));
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if (int_arg) {
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so->so_state |= SS_ASYNC;
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so->so_rcv.sb_flags |= SB_ASYNC;
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so->so_snd.sb_flags |= SB_ASYNC;
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} else {
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so->so_state &= ~SS_ASYNC;
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so->so_rcv.sb_flags &= ~SB_ASYNC;
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so->so_snd.sb_flags &= ~SB_ASYNC;
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}
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goto out;
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case FIONREAD: /* int */
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bcopy(&so->so_rcv.sb_cc, data, sizeof(u_int32_t));
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goto out;
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case SIOCSPGRP: /* int */
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bcopy(data, &so->so_pgid, sizeof(pid_t));
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goto out;
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case SIOCGPGRP: /* int */
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bcopy(&so->so_pgid, data, sizeof(pid_t));
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goto out;
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case SIOCATMARK: /* int */
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int_arg = (so->so_state & SS_RCVATMARK) != 0;
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bcopy(&int_arg, data, sizeof(int_arg));
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goto out;
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case SIOCSETOT: /* int; deprecated */
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error = EOPNOTSUPP;
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goto out;
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case SIOCGASSOCIDS32: /* so_aidreq32 */
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case SIOCGASSOCIDS64: /* so_aidreq64 */
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case SIOCGCONNIDS32: /* so_cidreq32 */
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case SIOCGCONNIDS64: /* so_cidreq64 */
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case SIOCGCONNINFO32: /* so_cinforeq32 */
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case SIOCGCONNINFO64: /* so_cinforeq64 */
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case SIOCSCONNORDER: /* so_cordreq */
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case SIOCGCONNORDER: /* so_cordreq */
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error = (*so->so_proto->pr_usrreqs->pru_control)(so,
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cmd, data, NULL, p);
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goto out;
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}
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/*
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* Interface/routing/protocol specific ioctls:
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* interface and routing ioctls should have a
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* different entry since a socket's unnecessary
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*/
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if (IOCGROUP(cmd) == 'i') {
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error = ifioctllocked(so, cmd, data, p);
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} else {
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if (IOCGROUP(cmd) == 'r') {
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error = rtioctl(cmd, data, p);
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} else {
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error = (*so->so_proto->pr_usrreqs->pru_control)(so,
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cmd, data, NULL, p);
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}
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}
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out:
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socket_unlock(so, 1);
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if (error == EJUSTRETURN) {
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error = 0;
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}
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return error;
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}
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int
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soo_ioctl(struct fileproc *fp, u_long cmd, caddr_t data, vfs_context_t ctx)
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{
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struct socket *so;
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proc_t procp = vfs_context_proc(ctx);
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if ((so = (struct socket *)fp_get_data(fp)) == NULL) {
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/* This is not a valid open file descriptor */
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return EBADF;
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}
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return soioctl(so, cmd, data, procp);
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}
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int
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soo_select(struct fileproc *fp, int which, void *wql, vfs_context_t ctx)
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{
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struct socket *so = (struct socket *)fp_get_data(fp);
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int retnum = 0;
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proc_t procp;
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if (so == NULL || so == (struct socket *)-1) {
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return 0;
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}
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procp = vfs_context_proc(ctx);
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socket_lock(so, 1);
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switch (which) {
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case FREAD:
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so->so_rcv.sb_flags |= SB_SEL;
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if (soreadable(so)) {
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retnum = 1;
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so->so_rcv.sb_flags &= ~SB_SEL;
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goto done;
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}
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selrecord(procp, &so->so_rcv.sb_sel, wql);
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break;
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case FWRITE:
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so->so_snd.sb_flags |= SB_SEL;
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if (sowriteable(so)) {
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retnum = 1;
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so->so_snd.sb_flags &= ~SB_SEL;
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goto done;
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}
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selrecord(procp, &so->so_snd.sb_sel, wql);
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break;
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case 0:
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so->so_rcv.sb_flags |= SB_SEL;
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if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) {
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retnum = 1;
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so->so_rcv.sb_flags &= ~SB_SEL;
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goto done;
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}
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selrecord(procp, &so->so_rcv.sb_sel, wql);
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break;
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}
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done:
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socket_unlock(so, 1);
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return retnum;
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}
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int
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soo_stat(struct socket *so, void *ub, int isstat64)
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{
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int ret;
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/* warning avoidance ; protected by isstat64 */
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struct stat *sb = (struct stat *)0;
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/* warning avoidance ; protected by isstat64 */
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struct stat64 *sb64 = (struct stat64 *)0;
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#if CONFIG_MACF_SOCKET_SUBSET
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ret = mac_socket_check_stat(kauth_cred_get(), so);
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if (ret) {
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return ret;
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}
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#endif
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if (isstat64 != 0) {
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sb64 = (struct stat64 *)ub;
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bzero((caddr_t)sb64, sizeof(*sb64));
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} else {
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sb = (struct stat *)ub;
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bzero((caddr_t)sb, sizeof(*sb));
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}
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socket_lock(so, 1);
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if (isstat64 != 0) {
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sb64->st_mode = S_IFSOCK;
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if ((so->so_state & SS_CANTRCVMORE) == 0 ||
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so->so_rcv.sb_cc != 0) {
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sb64->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
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}
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if ((so->so_state & SS_CANTSENDMORE) == 0) {
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sb64->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
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}
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sb64->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
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sb64->st_uid = kauth_cred_getuid(so->so_cred);
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sb64->st_gid = kauth_cred_getgid(so->so_cred);
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} else {
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sb->st_mode = S_IFSOCK;
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if ((so->so_state & SS_CANTRCVMORE) == 0 ||
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so->so_rcv.sb_cc != 0) {
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sb->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
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}
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if ((so->so_state & SS_CANTSENDMORE) == 0) {
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sb->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
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}
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sb->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
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sb->st_uid = kauth_cred_getuid(so->so_cred);
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sb->st_gid = kauth_cred_getgid(so->so_cred);
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}
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ret = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub, isstat64);
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socket_unlock(so, 1);
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return ret;
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}
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/* ARGSUSED */
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static int
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soo_close(struct fileglob *fg, __unused vfs_context_t ctx)
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{
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int error = 0;
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struct socket *sp;
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sp = (struct socket *)fg_get_data(fg);
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fg_set_data(fg, NULL);
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if (sp) {
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error = soclose(sp);
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}
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return error;
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}
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static int
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soo_drain(struct fileproc *fp, __unused vfs_context_t ctx)
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{
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int error = 0;
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struct socket *so = (struct socket *)fp_get_data(fp);
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if (so) {
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socket_lock(so, 1);
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so->so_state |= SS_DRAINING;
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wakeup((caddr_t)&so->so_timeo);
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sorwakeup(so);
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sowwakeup(so);
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soevent(so, SO_FILT_HINT_LOCKED);
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socket_unlock(so, 1);
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}
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return error;
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}
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/*
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* 's' group ioctls.
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*
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* The switch statement below does nothing at runtime, as it serves as a
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* compile time check to ensure that all of the socket 's' ioctls (those
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* in the 's' group going thru soo_ioctl) that are made available by the
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* networking stack is unique. This works as long as this routine gets
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* updated each time a new interface ioctl gets added.
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*
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* Any failures at compile time indicates duplicated ioctl values.
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*/
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static __attribute__((unused)) void
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soioctl_cassert(void)
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{
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/*
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* This is equivalent to _CASSERT() and the compiler wouldn't
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* generate any instructions, thus for compile time only.
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*/
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switch ((u_long)0) {
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case 0:
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/* bsd/sys/sockio.h */
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case SIOCSHIWAT:
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case SIOCGHIWAT:
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case SIOCSLOWAT:
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case SIOCGLOWAT:
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case SIOCATMARK:
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case SIOCSPGRP:
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case SIOCGPGRP:
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case SIOCSETOT:
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case SIOCGASSOCIDS32:
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case SIOCGASSOCIDS64:
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case SIOCGCONNIDS32:
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case SIOCGCONNIDS64:
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case SIOCGCONNINFO32:
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case SIOCGCONNINFO64:
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case SIOCSCONNORDER:
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case SIOCGCONNORDER:
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;
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}
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}
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