sys_socket.c

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/*-
 * Copyright (c) 1982, 1986, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
 */

#include <sys/cdefs.h>
__FBSDID("$BSDSUniX$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/sigio.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/filio.h>                  /* XXX */
#include <sys/sockio.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/ucred.h>

#include <net/if.h>
#include <net/route.h>
#include <net/vnet.h>

#include <security/mac/mac_framework.h>

struct fileops  socketops = {
        .fo_read = soo_read,
        .fo_write = soo_write,
        .fo_truncate = soo_truncate,
        .fo_ioctl = soo_ioctl,
        .fo_poll = soo_poll,
        .fo_kqfilter = soo_kqfilter,
        .fo_stat = soo_stat,
        .fo_close = soo_close,
        .fo_chmod = invfo_chmod,
        .fo_chown = invfo_chown,
        .fo_flags = DFLAG_PASSABLE
};

/* ARGSUSED */
int
soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
    int flags, struct thread *td)
{
        struct socket *so = fp->f_data;
        int error;

#ifdef MAC
        error = mac_socket_check_receive(active_cred, so);
        if (error)
                return (error);
#endif
        error = soreceive(so, 0, uio, 0, 0, 0);
        return (error);
}

/* ARGSUSED */
int
soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
    int flags, struct thread *td)
{
        struct socket *so = fp->f_data;
        int error;

#ifdef MAC
        error = mac_socket_check_send(active_cred, so);
        if (error)
                return (error);
#endif
        error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td);
        if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
                PROC_LOCK(uio->uio_td->td_proc);
                tdsignal(uio->uio_td, SIGPIPE);
                PROC_UNLOCK(uio->uio_td->td_proc);
        }
        return (error);
}

int
soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
    struct thread *td)
{

        return (EINVAL);
}

int
soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
    struct thread *td)
{
        struct socket *so = fp->f_data;
        int error = 0;

        switch (cmd) {
        case FIONBIO:
                SOCK_LOCK(so);
                if (*(int *)data)
                        so->so_state |= SS_NBIO;
                else
                        so->so_state &= ~SS_NBIO;
                SOCK_UNLOCK(so);
                break;

        case FIOASYNC:
                /*
                 * XXXRW: This code separately acquires SOCK_LOCK(so) and
                 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same
                 * mutex to avoid introducing the assumption that they are
                 * the same.
                 */
                if (*(int *)data) {
                        SOCK_LOCK(so);
                        so->so_state |= SS_ASYNC;
                        SOCK_UNLOCK(so);
                        SOCKBUF_LOCK(&so->so_rcv);
                        so->so_rcv.sb_flags |= SB_ASYNC;
                        SOCKBUF_UNLOCK(&so->so_rcv);
                        SOCKBUF_LOCK(&so->so_snd);
                        so->so_snd.sb_flags |= SB_ASYNC;
                        SOCKBUF_UNLOCK(&so->so_snd);
                } else {
                        SOCK_LOCK(so);
                        so->so_state &= ~SS_ASYNC;
                        SOCK_UNLOCK(so);
                        SOCKBUF_LOCK(&so->so_rcv);
                        so->so_rcv.sb_flags &= ~SB_ASYNC;
                        SOCKBUF_UNLOCK(&so->so_rcv);
                        SOCKBUF_LOCK(&so->so_snd);
                        so->so_snd.sb_flags &= ~SB_ASYNC;
                        SOCKBUF_UNLOCK(&so->so_snd);
                }
                break;

        case FIONREAD:
                /* Unlocked read. */
                *(int *)data = so->so_rcv.sb_cc;
                break;

        case FIONWRITE:
                /* Unlocked read. */
                *(int *)data = so->so_snd.sb_cc;
                break;

        case FIONSPACE:
                if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) ||
                    (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
                        *(int *)data = 0;
                else
                        *(int *)data = sbspace(&so->so_snd);
                break;

        case FIOSETOWN:
                error = fsetown(*(int *)data, &so->so_sigio);
                break;

        case FIOGETOWN:
                *(int *)data = fgetown(&so->so_sigio);
                break;

        case SIOCSPGRP:
                error = fsetown(-(*(int *)data), &so->so_sigio);
                break;

        case SIOCGPGRP:
                *(int *)data = -fgetown(&so->so_sigio);
                break;

        case SIOCATMARK:
                /* Unlocked read. */
                *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
                break;
        default:
                /*
                 * Interface/routing/protocol specific ioctls: interface and
                 * routing ioctls should have a different entry since a
                 * socket is unnecessary.
                 */
                if (IOCGROUP(cmd) == 'i')
                        error = ifioctl(so, cmd, data, td);
                else if (IOCGROUP(cmd) == 'r') {
                        CURVNET_SET(so->so_vnet);
                        error = rtioctl_fib(cmd, data, so->so_fibnum);
                        CURVNET_RESTORE();
                } else {
                        CURVNET_SET(so->so_vnet);
                        error = ((*so->so_proto->pr_usrreqs->pru_control)
                            (so, cmd, data, 0, td));
                        CURVNET_RESTORE();
                }
                break;
        }
        return (error);
}

int
soo_poll(struct file *fp, int events, struct ucred *active_cred,
    struct thread *td)
{
        struct socket *so = fp->f_data;
#ifdef MAC
        int error;

        error = mac_socket_check_poll(active_cred, so);
        if (error)
                return (error);
#endif
        return (sopoll(so, events, fp->f_cred, td));
}

int
soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
    struct thread *td)
{
        struct socket *so = fp->f_data;
#ifdef MAC
        int error;
#endif

        bzero((caddr_t)ub, sizeof (*ub));
        ub->st_mode = S_IFSOCK;
#ifdef MAC
        error = mac_socket_check_stat(active_cred, so);
        if (error)
                return (error);
#endif
        /*
         * If SBS_CANTRCVMORE is set, but there's still data left in the
         * receive buffer, the socket is still readable.
         */
        SOCKBUF_LOCK(&so->so_rcv);
        if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
            so->so_rcv.sb_cc != 0)
                ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
        ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
        SOCKBUF_UNLOCK(&so->so_rcv);
        /* Unlocked read. */
        if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
                ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
        ub->st_uid = so->so_cred->cr_uid;
        ub->st_gid = so->so_cred->cr_gid;
        return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
}

/*
 * API socket close on file pointer.  We call soclose() to close the socket
 * (including initiating closing protocols).  soclose() will sorele() the
 * file reference but the actual socket will not go away until the socket's
 * ref count hits 0.
 */
/* ARGSUSED */
int
soo_close(struct file *fp, struct thread *td)
{
        int error = 0;
        struct socket *so;

        so = fp->f_data;
        fp->f_ops = &badfileops;
        fp->f_data = NULL;

        if (so)
                error = soclose(so);
        return (error);
}