/*      $NetBSD: sys_socket.c,v 1.84 2024/12/06 18:44:00 riastradh Exp $        */

/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* 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        8.3 (Berkeley) 2/14/95
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.84 2024/12/06 18:44:00 riastradh Exp $");

#include <sys/param.h>
#include <sys/types.h>

#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/kauth.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/sdt.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/systm.h>

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

static int soo_fpathconf(struct file *, int, register_t *);
static int soo_posix_fadvise(struct file *, off_t, off_t, int);

const struct fileops socketops = {
       .fo_name = "socket",
       .fo_read = soo_read,
       .fo_write = soo_write,
       .fo_ioctl = soo_ioctl,
       .fo_fcntl = fnullop_fcntl,
       .fo_poll = soo_poll,
       .fo_stat = soo_stat,
       .fo_close = soo_close,
       .fo_kqfilter = soo_kqfilter,
       .fo_restart = soo_restart,
       .fo_fpathconf = soo_fpathconf,
       .fo_posix_fadvise = soo_posix_fadvise,
};

int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp;

/* ARGSUSED */
int
soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
        int flags)
{
       struct socket *so = fp->f_socket;
       int error;

       error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL);

       return error;
}

/* ARGSUSED */
int
soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
         int flags)
{
       struct socket *so = fp->f_socket;
       int error;

       error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp);

       return error;
}

int
soo_ioctl(file_t *fp, u_long cmd, void *data)
{
       struct socket *so = fp->f_socket;
       int error = 0;

       switch (cmd) {

       case FIONBIO:
               solock(so);
               if (*(int *)data)
                       so->so_state |= SS_NBIO;
               else
                       so->so_state &= ~SS_NBIO;
               sounlock(so);
               break;

       case FIOASYNC:
               solock(so);
               if (*(int *)data) {
                       so->so_rcv.sb_flags |= SB_ASYNC;
                       so->so_snd.sb_flags |= SB_ASYNC;
               } else {
                       so->so_rcv.sb_flags &= ~SB_ASYNC;
                       so->so_snd.sb_flags &= ~SB_ASYNC;
               }
               sounlock(so);
               break;

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

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

       case FIONSPACE:
               /*
                * See the comment around sbspace()'s definition
                * in sys/socketvar.h in face of counts about maximum
                * to understand the following test. We detect overflow
                * and return zero.
                */
               solock(so);
               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);
               sounlock(so);
               break;

       case SIOCSPGRP:
       case FIOSETOWN:
       case TIOCSPGRP:
               error = fsetown(&so->so_pgid, cmd, data);
               break;

       case SIOCGPGRP:
       case FIOGETOWN:
       case TIOCGPGRP:
               error = fgetown(so->so_pgid, cmd, data);
               break;

       case SIOCATMARK:
               *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
               break;

       case SIOCPEELOFF:
               solock(so);
               error = do_sys_peeloff(so, data);
               sounlock(so);
               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')
                       /*
                        * KERNEL_LOCK will be held later if if_ioctl() of the
                        * interface isn't MP-safe.
                        */
                       error = ifioctl(so, cmd, data, curlwp);
               else {
                       KERNEL_LOCK(1, NULL);
                       error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so,
                           cmd, data, NULL);
                       KERNEL_UNLOCK_ONE(NULL);
               }
               break;
       }


       return error;
}

int
soo_poll(file_t *fp, int events)
{

       return sopoll(fp->f_socket, events);
}

int
soo_stat(file_t *fp, struct stat *ub)
{
       struct socket *so = fp->f_socket;
       int error;

       memset(ub, 0, sizeof(*ub));
       ub->st_mode = S_IFSOCK;

       solock(so);
       error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub);
       sounlock(so);

       return error;
}

/* ARGSUSED */
int
soo_close(file_t *fp)
{
       int error = 0;

       if (fp->f_socket)
               error = soclose(fp->f_socket);
       fp->f_socket = NULL;

       return error;
}

void
soo_restart(file_t *fp)
{

       sorestart(fp->f_socket);
}

static int
soo_fpathconf(struct file *fp, int name, register_t *retval)
{

       switch (name) {
       case _PC_PIPE_BUF:
               *retval = PIPE_BUF;
               return 0;
       default:
               return SET_ERROR(EINVAL);
       }
}

static int
soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice)
{

       return SET_ERROR(ESPIPE);
}

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