// 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 *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 *sockaddr,
  		       int sockaddr_len, int flags)

  {

  	return pvc_bind(sock, sockaddr, sockaddr_len);

  }
  
  static int pvc_setsockopt(struct socket *sock, int level, int optname,

  			  char __user *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 *sockaddr_len, 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;

  	*sockaddr_len = sizeof(struct sockaddr_atmpvc);

  	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 0;
  }

  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

  	.listen =	sock_no_listen,
  	.shutdown =	pvc_shutdown,
  	.setsockopt =	pvc_setsockopt,
  	.getsockopt =	pvc_getsockopt,
  	.sendmsg =	vcc_sendmsg,
  	.recvmsg =	vcc_recvmsg,
  	.mmap =		sock_no_mmap,
  	.sendpage =	sock_no_sendpage,
  };

  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);
  }