/*
 * 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.
 * 3. 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
 * $FreeBSD: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/lock.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/socketops.h>
#include <sys/filio.h>                  /* XXX */
#include <sys/sockio.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/filedesc.h>
#include <sys/ucred.h>

#include <sys/socketvar2.h>

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

struct  fileops socketops = {
        .fo_read = soo_read,
        .fo_write = soo_write,
        .fo_ioctl = soo_ioctl,
        .fo_kqfilter = sokqfilter,
        .fo_stat = soo_stat,
        .fo_close = soo_close,
        .fo_shutdown = soo_shutdown,
        .fo_seek = badfo_seek
};

/*
 * MPSAFE
 */
int
soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
{
        struct socket *so;
        int error;
        int msgflags;

        atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC);

        so = (struct socket *)fp->f_data;

        if (fflags & O_FBLOCKING)
                msgflags = 0;
        else if (fflags & O_FNONBLOCKING)
                msgflags = MSG_FNONBLOCKING;
        else if (fp->f_flag & FNONBLOCK)
                msgflags = MSG_FNONBLOCKING;
        else
                msgflags = 0;

        error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
        return (error);
}

/*
 * MPSAFE
 */
int
soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
{
        struct socket *so;
        int error;
        int msgflags;

        so = (struct socket *)fp->f_data;

        if (fflags & O_FBLOCKING)
                msgflags = 0;
        else if (fflags & O_FNONBLOCKING)
                msgflags = MSG_FNONBLOCKING;
        else if (fp->f_flag & FNONBLOCK)
                msgflags = MSG_FNONBLOCKING;
        else
                msgflags = 0;

        error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
        if (error == EPIPE && !(fflags & MSG_NOSIGNAL) &&
            !(so->so_options & SO_NOSIGPIPE) &&
            uio->uio_td->td_lwp) {
                lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE);
        }
        return (error);
}

/*
 * MPSAFE
 */
int
soo_ioctl(struct file *fp, u_long cmd, caddr_t data,
          struct ucred *cred, struct sysmsg *msg)
{
        struct socket *so;
        int error;

        so = (struct socket *)fp->f_data;

        switch (cmd) {
        case FIONBIO:
                error = 0;
                break;
        case FIOASYNC:
                if (*(int *)data) {
                        sosetstate(so, SS_ASYNC);
                        atomic_set_int(&so->so_rcv.ssb_flags,  SSB_ASYNC);
                        atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC);
                } else {
                        soclrstate(so, SS_ASYNC);
                        atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC);
                        atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC);
                }
                error = 0;
                break;
        case FIONREAD:
                *(int *)data = so->so_rcv.ssb_cc;
                error = 0;
                break;
        case FIOSETOWN:
                error = fsetown(*(int *)data, &so->so_sigio);
                break;
        case FIOGETOWN:
                *(int *)data = fgetown(&so->so_sigio);
                error = 0;
                break;
        case SIOCSPGRP:
                error = fsetown(-(*(int *)data), &so->so_sigio);
                break;
        case SIOCGPGRP:
                *(int *)data = -fgetown(&so->so_sigio);
                error = 0;
                break;
        case SIOCATMARK:
                *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
                error = 0;
                break;
        default:
                /*
                 * Interface/routing/protocol specific ioctls:
                 * interface and routing ioctls should have a
                 * different entry since a socket's unnecessary
                 */
                if (IOCGROUP(cmd) == 'i') {
                        error = ifioctl(so, cmd, data, cred);
                } else if (IOCGROUP(cmd) == 'r') {
                        error = rtioctl(cmd, data, cred);
                } else {
                        error = so_pru_control_direct(so, cmd, data, NULL);
                }
                break;
        }
        return (error);
}

/*
 * MPSAFE
 */
int
soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
{
        struct socket *so;
        int error;

        bzero((caddr_t)ub, sizeof (*ub));
        ub->st_mode = S_IFSOCK;
        so = (struct socket *)fp->f_data;

        /*
         * If SS_CANTRCVMORE is set, but there's still data left in the
         * receive buffer, the socket is still readable.
         */
        if ((so->so_state & SS_CANTRCVMORE) == 0 ||
            so->so_rcv.ssb_cc != 0)
                ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
        if ((so->so_state & SS_CANTSENDMORE) == 0)
                ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
        ub->st_size = so->so_rcv.ssb_cc;
        ub->st_uid = so->so_cred->cr_uid;
        ub->st_gid = so->so_cred->cr_gid;
        ub->st_ino = so->so_inum;
        error = so_pru_sense(so, ub);

        return (error);
}

/*
 * MPSAFE
 */
int
soo_close(struct file *fp)
{
        int error;

        fp->f_ops = &badfileops;
        if (fp->f_data)
                error = soclose((struct socket *)fp->f_data, fp->f_flag);
        else
                error = 0;
        fp->f_data = NULL;
        return (error);
}

/*
 * MPSAFE
 */
int
soo_shutdown(struct file *fp, int how)
{
        int error;

        if (fp->f_data)
                error = soshutdown((struct socket *)fp->f_data, how);
        else
                error = 0;
        return (error);
}