pvc.c

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/* 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);
}

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);
}