/*      $NetBSD: sco_socket.c,v 1.39 2024/07/05 04:31:53 rin Exp $      */

/*-
 * Copyright (c) 2006 Itronix Inc.
 * 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. The name of Itronix Inc. may not be used to endorse
 *    or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``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 ITRONIX INC. 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sco_socket.c,v 1.39 2024/07/05 04:31:53 rin Exp $");

/* load symbolic names */
#ifdef BLUETOOTH_DEBUG
#define PRUREQUESTS
#define PRCOREQUESTS
#endif

#include <sys/param.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>

#include <netbt/bluetooth.h>
#include <netbt/hci.h>
#include <netbt/sco.h>

/*******************************************************************************
 *
 * SCO SOCK_SEQPACKET sockets - low latency audio data
 */

static void sco_connecting(void *);
static void sco_connected(void *);
static void sco_disconnected(void *, int);
static void *sco_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
static void sco_complete(void *, int);
static void sco_linkmode(void *, int);
static void sco_input(void *, struct mbuf *);

static const struct btproto sco_proto = {
        sco_connecting,
        sco_connected,
        sco_disconnected,
        sco_newconn,
        sco_complete,
        sco_linkmode,
        sco_input,
};

int sco_sendspace = 4096;
int sco_recvspace = 4096;

static int
sco_attach(struct socket *so, int proto)
{
        int error;

        KASSERT(so->so_pcb == NULL);

        if (so->so_lock == NULL) {
                mutex_obj_hold(bt_lock);
                so->so_lock = bt_lock;
                solock(so);
        }
        KASSERT(solocked(so));

        error = soreserve(so, sco_sendspace, sco_recvspace);
        if (error) {
                return error;
        }
        return sco_attach_pcb((struct sco_pcb **)&so->so_pcb, &sco_proto, so);
}

static void
sco_detach(struct socket *so)
{
        KASSERT(so->so_pcb != NULL);
        sco_detach_pcb((struct sco_pcb **)&so->so_pcb);
        KASSERT(so->so_pcb == NULL);
}

static int
sco_accept(struct socket *so, struct sockaddr *nam)
{
        struct sco_pcb *pcb = so->so_pcb;

        KASSERT(solocked(so));
        KASSERT(nam != NULL);

        if (pcb == NULL)
                return EINVAL;

        return sco_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
}

static int
sco_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
        struct sco_pcb *pcb = so->so_pcb;
        struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;

        KASSERT(solocked(so));
        KASSERT(nam != NULL);

        if (pcb == NULL)
                return EINVAL;

        if (sa->bt_len != sizeof(struct sockaddr_bt))
                return EINVAL;

        if (sa->bt_family != AF_BLUETOOTH)
                return EAFNOSUPPORT;

        return sco_bind_pcb(pcb, sa);
}

static int
sco_listen(struct socket *so, struct lwp *l)
{
        struct sco_pcb *pcb = so->so_pcb;

        KASSERT(solocked(so));

        if (pcb == NULL)
                return EINVAL;

        return sco_listen_pcb(pcb);
}

static int
sco_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
        struct sco_pcb *pcb = so->so_pcb;
        struct sockaddr_bt *sa = (struct sockaddr_bt *)nam;

        KASSERT(solocked(so));
        KASSERT(nam != NULL);

        if (pcb == NULL)
                return EINVAL;

        if (sa->bt_len != sizeof(struct sockaddr_bt))
                return EINVAL;

        if (sa->bt_family != AF_BLUETOOTH)
                return EAFNOSUPPORT;

        soisconnecting(so);
        return sco_connect_pcb(pcb, sa);
}

static int
sco_connect2(struct socket *so, struct socket *so2)
{
        struct sco_pcb *pcb = so->so_pcb;

        KASSERT(solocked(so));

        if (pcb == NULL)
                return EINVAL;

        return EOPNOTSUPP;
}

static int
sco_disconnect(struct socket *so)
{
        struct sco_pcb *pcb = so->so_pcb;

        KASSERT(solocked(so));

        if (pcb == NULL)
                return EINVAL;

        soisdisconnecting(so);
        return sco_disconnect_pcb(pcb, so->so_linger);
}

static int
sco_shutdown(struct socket *so)
{
        KASSERT(solocked(so));

        socantsendmore(so);
        return 0;
}

static int
sco_abort(struct socket *so)
{
        struct sco_pcb *pcb = so->so_pcb;

        KASSERT(solocked(so));

        if (pcb == NULL)
                return EINVAL;

        sco_disconnect_pcb(pcb, 0);
        soisdisconnected(so);
        sco_detach(so);
        return 0;
}

static int
sco_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
{
        return EOPNOTSUPP;
}

static int
sco_stat(struct socket *so, struct stat *ub)
{
        KASSERT(solocked(so));

        return 0;
}

static int
sco_peeraddr(struct socket *so, struct sockaddr *nam)
{
        struct sco_pcb *pcb = (struct sco_pcb *)so->so_pcb;

        KASSERT(solocked(so));
        KASSERT(pcb != NULL);
        KASSERT(nam != NULL);

        return sco_peeraddr_pcb(pcb, (struct sockaddr_bt *)nam);
}

static int
sco_sockaddr(struct socket *so, struct sockaddr *nam)
{
        struct sco_pcb *pcb = (struct sco_pcb *)so->so_pcb;

        KASSERT(solocked(so));
        KASSERT(pcb != NULL);
        KASSERT(nam != NULL);

        return sco_sockaddr_pcb(pcb, (struct sockaddr_bt *)nam);
}

static int
sco_rcvd(struct socket *so, int flags, struct lwp *l)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
sco_recvoob(struct socket *so, struct mbuf *m, int flags)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
sco_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
    struct mbuf *control, struct lwp *l)
{
        struct sco_pcb *pcb = so->so_pcb;
        int err = 0;
        struct mbuf *m0;

        KASSERT(solocked(so));
        KASSERT(m != NULL);

        m_freem(control); /* no use for that */

        if (pcb == NULL) {
                err = EINVAL;
                goto release;
        }

        if (m->m_pkthdr.len == 0)
                goto release;

        if (m->m_pkthdr.len > pcb->sp_mtu) {
                err = EMSGSIZE;
                goto release;
        }

        m0 = m_copypacket(m, M_DONTWAIT);
        if (m0 == NULL) {
                err = ENOMEM;
                goto release;
        }

        sbappendrecord(&so->so_snd, m);
        return sco_send_pcb(pcb, m0);

release:
        m_freem(m);
        return err;
}

static int
sco_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
{
        KASSERT(solocked(so));

        m_freem(m);
        m_freem(control);

        return EOPNOTSUPP;
}

static int
sco_purgeif(struct socket *so, struct ifnet *ifp)
{

        return EOPNOTSUPP;
}

/*
 * get/set socket options
 */
int
sco_ctloutput(int req, struct socket *so, struct sockopt *sopt)
{
        struct sco_pcb *pcb = (struct sco_pcb *)so->so_pcb;
        int err = 0;

        DPRINTFN(2, "req %s\n", prcorequests[req]);

        if (pcb == NULL)
                return EINVAL;

        if (sopt->sopt_level != BTPROTO_SCO)
                return ENOPROTOOPT;

        switch(req) {
        case PRCO_GETOPT:
                err = sco_getopt(pcb, sopt);
                break;

        case PRCO_SETOPT:
                err = sco_setopt(pcb, sopt);
                break;

        default:
                err = ENOPROTOOPT;
                break;
        }

        return err;
}

/*****************************************************************************
 *
 *      SCO Protocol socket callbacks
 *
 */
static void
sco_connecting(void *arg)
{
        struct socket *so = arg;

        DPRINTF("Connecting\n");
        soisconnecting(so);
}

static void
sco_connected(void *arg)
{
        struct socket *so = arg;

        DPRINTF("Connected\n");
        soisconnected(so);
}

static void
sco_disconnected(void *arg, int err)
{
        struct socket *so = arg;

        DPRINTF("Disconnected (%d)\n", err);

        so->so_error = err;
        soisdisconnected(so);
}

static void *
sco_newconn(void *arg, struct sockaddr_bt *laddr,
    struct sockaddr_bt *raddr)
{
        struct socket *so = arg;

        DPRINTF("New Connection\n");
        so = sonewconn(so, false);
        if (so == NULL)
                return NULL;

        soisconnecting(so);
        return so->so_pcb;
}

static void
sco_complete(void *arg, int num)
{
        struct socket *so = arg;

        while (num-- > 0)
                sbdroprecord(&so->so_snd);

        sowwakeup(so);
}

static void
sco_linkmode(void *arg, int mode)
{
}

static void
sco_input(void *arg, struct mbuf *m)
{
        struct socket *so = arg;

        /*
         * since this data is time sensitive, if the buffer
         * is full we just dump data until the latest one
         * will fit.
         */

        while (m->m_pkthdr.len > sbspace(&so->so_rcv))
                sbdroprecord(&so->so_rcv);

        DPRINTFN(10, "received %d bytes\n", m->m_pkthdr.len);

        sbappendrecord(&so->so_rcv, m);
        sorwakeup(so);
}

PR_WRAP_USRREQS(sco)

#define sco_attach              sco_attach_wrapper
#define sco_detach              sco_detach_wrapper
#define sco_accept              sco_accept_wrapper
#define sco_bind                sco_bind_wrapper
#define sco_listen              sco_listen_wrapper
#define sco_connect             sco_connect_wrapper
#define sco_connect2            sco_connect2_wrapper
#define sco_disconnect          sco_disconnect_wrapper
#define sco_shutdown            sco_shutdown_wrapper
#define sco_abort               sco_abort_wrapper
#define sco_ioctl               sco_ioctl_wrapper
#define sco_stat                sco_stat_wrapper
#define sco_peeraddr            sco_peeraddr_wrapper
#define sco_sockaddr            sco_sockaddr_wrapper
#define sco_rcvd                sco_rcvd_wrapper
#define sco_recvoob             sco_recvoob_wrapper
#define sco_send                sco_send_wrapper
#define sco_sendoob             sco_sendoob_wrapper
#define sco_purgeif             sco_purgeif_wrapper

const struct pr_usrreqs sco_usrreqs = {
        .pr_attach      = sco_attach,
        .pr_detach      = sco_detach,
        .pr_accept      = sco_accept,
        .pr_bind        = sco_bind,
        .pr_listen      = sco_listen,
        .pr_connect     = sco_connect,
        .pr_connect2    = sco_connect2,
        .pr_disconnect  = sco_disconnect,
        .pr_shutdown    = sco_shutdown,
        .pr_abort       = sco_abort,
        .pr_ioctl       = sco_ioctl,
        .pr_stat        = sco_stat,
        .pr_peeraddr    = sco_peeraddr,
        .pr_sockaddr    = sco_sockaddr,
        .pr_rcvd        = sco_rcvd,
        .pr_recvoob     = sco_recvoob,
        .pr_send        = sco_send,
        .pr_sendoob     = sco_sendoob,
        .pr_purgeif     = sco_purgeif,
};