// SPDX-License-Identifier: GPL-2.0
/* net/atm/pvc.c - ATM PVC sockets */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#include <linux/net.h>          /* struct socket, struct proto_ops */
#include <linux/atm.h>          /* ATM stuff */
#include <linux/atmdev.h>       /* ATM devices */
#include <linux/errno.h>        /* error codes */
#include <linux/kernel.h>       /* printk */
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/export.h>
#include <net/sock.h>           /* for sock_no_* */

#include "resources.h"          /* devs and vccs */
#include "common.h"             /* common for PVCs and SVCs */


static int pvc_shutdown(struct socket *sock, int how)
{
        return 0;
}

static int pvc_bind(struct socket *sock, struct sockaddr_unsized *sockaddr,
                    int sockaddr_len)
{
        struct sock *sk = sock->sk;
        struct sockaddr_atmpvc *addr;
        struct atm_vcc *vcc;
        int error;

        if (sockaddr_len != sizeof(struct sockaddr_atmpvc))
                return -EINVAL;
        addr = (struct sockaddr_atmpvc *)sockaddr;
        if (addr->sap_family != AF_ATMPVC)
                return -EAFNOSUPPORT;
        lock_sock(sk);
        vcc = ATM_SD(sock);
        if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
                error = -EBADFD;
                goto out;
        }
        if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
                if (vcc->vpi != ATM_VPI_UNSPEC)
                        addr->sap_addr.vpi = vcc->vpi;
                if (vcc->vci != ATM_VCI_UNSPEC)
                        addr->sap_addr.vci = vcc->vci;
        }
        error = vcc_connect(sock, addr->sap_addr.itf, addr->sap_addr.vpi,
                            addr->sap_addr.vci);
out:
        release_sock(sk);
        return error;
}

static int pvc_connect(struct socket *sock, struct sockaddr_unsized *sockaddr,
                       int sockaddr_len, int flags)
{
        return pvc_bind(sock, sockaddr, sockaddr_len);
}

static int pvc_setsockopt(struct socket *sock, int level, int optname,
                          sockptr_t optval, unsigned int optlen)
{
        struct sock *sk = sock->sk;
        int error;

        lock_sock(sk);
        error = vcc_setsockopt(sock, level, optname, optval, optlen);
        release_sock(sk);
        return error;
}

static int pvc_getsockopt(struct socket *sock, int level, int optname,
                          char __user *optval, int __user *optlen)
{
        struct sock *sk = sock->sk;
        int error;

        lock_sock(sk);
        error = vcc_getsockopt(sock, level, optname, optval, optlen);
        release_sock(sk);
        return error;
}

static int pvc_getname(struct socket *sock, struct sockaddr *sockaddr,
                       int peer)
{
        struct sockaddr_atmpvc *addr;
        struct atm_vcc *vcc = ATM_SD(sock);

        if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
                return -ENOTCONN;
        addr = (struct sockaddr_atmpvc *)sockaddr;
        memset(addr, 0, sizeof(*addr));
        addr->sap_family = AF_ATMPVC;
        addr->sap_addr.itf = vcc->dev->number;
        addr->sap_addr.vpi = vcc->vpi;
        addr->sap_addr.vci = vcc->vci;
        return sizeof(struct sockaddr_atmpvc);
}

static const struct proto_ops pvc_proto_ops = {
        .family =       PF_ATMPVC,
        .owner =        THIS_MODULE,

        .release =      vcc_release,
        .bind =         pvc_bind,
        .connect =      pvc_connect,
        .socketpair =   sock_no_socketpair,
        .accept =       sock_no_accept,
        .getname =      pvc_getname,
        .poll =         vcc_poll,
        .ioctl =        vcc_ioctl,
#ifdef CONFIG_COMPAT
        .compat_ioctl = vcc_compat_ioctl,
#endif
        .gettstamp =    sock_gettstamp,
        .listen =       sock_no_listen,
        .shutdown =     pvc_shutdown,
        .setsockopt =   pvc_setsockopt,
        .getsockopt =   pvc_getsockopt,
        .sendmsg =      vcc_sendmsg,
        .recvmsg =      vcc_recvmsg,
        .mmap =         sock_no_mmap,
};


static int pvc_create(struct net *net, struct socket *sock, int protocol,
                      int kern)
{
        if (net != &init_net)
                return -EAFNOSUPPORT;

        sock->ops = &pvc_proto_ops;
        return vcc_create(net, sock, protocol, PF_ATMPVC, kern);
}

static const struct net_proto_family pvc_family_ops = {
        .family = PF_ATMPVC,
        .create = pvc_create,
        .owner = THIS_MODULE,
};


/*
 *      Initialize the ATM PVC protocol family
 */


int __init atmpvc_init(void)
{
        return sock_register(&pvc_family_ops);
}

void atmpvc_exit(void)
{
        sock_unregister(PF_ATMPVC);
}