LXR linux/net/atm/pvc.c

   1// SPDX-License-Identifier: GPL-2.0
   2/* net/atm/pvc.c - ATM PVC sockets */
   3
   4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   5
   6
   7#include <linux/net.h>          /* struct socket, struct proto_ops */
   8#include <linux/atm.h>          /* ATM stuff */
   9#include <linux/atmdev.h>       /* ATM devices */
  10#include <linux/errno.h>        /* error codes */
  11#include <linux/kernel.h>       /* printk */
  12#include <linux/init.h>
  13#include <linux/skbuff.h>
  14#include <linux/bitops.h>
  15#include <linux/export.h>
  16#include <net/sock.h>           /* for sock_no_* */
  17
  18#include "resources.h"          /* devs and vccs */
  19#include "common.h"             /* common for PVCs and SVCs */
  20
  21
  22static int pvc_shutdown(struct socket *sock, int how)
  23{
  24        return 0;
  25}
  26
  27static int pvc_bind(struct socket *sock, struct sockaddr *sockaddr,
  28                    int sockaddr_len)
  29{
  30        struct sock *sk = sock->sk;
  31        struct sockaddr_atmpvc *addr;
  32        struct atm_vcc *vcc;
  33        int error;
  34
  35        if (sockaddr_len != sizeof(struct sockaddr_atmpvc))
  36                return -EINVAL;
  37        addr = (struct sockaddr_atmpvc *)sockaddr;
  38        if (addr->sap_family != AF_ATMPVC)
  39                return -EAFNOSUPPORT;
  40        lock_sock(sk);
  41        vcc = ATM_SD(sock);
  42        if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
  43                error = -EBADFD;
  44                goto out;
  45        }
  46        if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
  47                if (vcc->vpi != ATM_VPI_UNSPEC)
  48                        addr->sap_addr.vpi = vcc->vpi;
  49                if (vcc->vci != ATM_VCI_UNSPEC)
  50                        addr->sap_addr.vci = vcc->vci;
  51        }
  52        error = vcc_connect(sock, addr->sap_addr.itf, addr->sap_addr.vpi,
  53                            addr->sap_addr.vci);
  54out:
  55        release_sock(sk);
  56        return error;
  57}
  58
  59static int pvc_connect(struct socket *sock, struct sockaddr *sockaddr,
  60                       int sockaddr_len, int flags)
  61{
  62        return pvc_bind(sock, sockaddr, sockaddr_len);
  63}
  64
  65static int pvc_setsockopt(struct socket *sock, int level, int optname,
  66                          sockptr_t optval, unsigned int optlen)
  67{
  68        struct sock *sk = sock->sk;
  69        int error;
  70
  71        lock_sock(sk);
  72        error = vcc_setsockopt(sock, level, optname, optval, optlen);
  73        release_sock(sk);
  74        return error;
  75}
  76
  77static int pvc_getsockopt(struct socket *sock, int level, int optname,
  78                          char __user *optval, int __user *optlen)
  79{
  80        struct sock *sk = sock->sk;
  81        int error;
  82
  83        lock_sock(sk);
  84        error = vcc_getsockopt(sock, level, optname, optval, optlen);
  85        release_sock(sk);
  86        return error;
  87}
  88
  89static int pvc_getname(struct socket *sock, struct sockaddr *sockaddr,
  90                       int peer)
  91{
  92        struct sockaddr_atmpvc *addr;
  93        struct atm_vcc *vcc = ATM_SD(sock);
  94
  95        if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
  96                return -ENOTCONN;
  97        addr = (struct sockaddr_atmpvc *)sockaddr;
  98        memset(addr, 0, sizeof(*addr));
  99        addr->sap_family = AF_ATMPVC;
 100        addr->sap_addr.itf = vcc->dev->number;
 101        addr->sap_addr.vpi = vcc->vpi;
 102        addr->sap_addr.vci = vcc->vci;
 103        return sizeof(struct sockaddr_atmpvc);
 104}
 105
 106static const struct proto_ops pvc_proto_ops = {
 107        .family =       PF_ATMPVC,
 108        .owner =        THIS_MODULE,
 109
 110        .release =      vcc_release,
 111        .bind =         pvc_bind,
 112        .connect =      pvc_connect,
 113        .socketpair =   sock_no_socketpair,
 114        .accept =       sock_no_accept,
 115        .getname =      pvc_getname,
 116        .poll =         vcc_poll,
 117        .ioctl =        vcc_ioctl,
 118#ifdef CONFIG_COMPAT
 119        .compat_ioctl = vcc_compat_ioctl,
 120#endif
 121        .gettstamp =    sock_gettstamp,
 122        .listen =       sock_no_listen,
 123        .shutdown =     pvc_shutdown,
 124        .setsockopt =   pvc_setsockopt,
 125        .getsockopt =   pvc_getsockopt,
 126        .sendmsg =      vcc_sendmsg,
 127        .recvmsg =      vcc_recvmsg,
 128        .mmap =         sock_no_mmap,
 129        .sendpage =     sock_no_sendpage,
 130};
 131
 132
 133static int pvc_create(struct net *net, struct socket *sock, int protocol,
 134                      int kern)
 135{
 136        if (net != &init_net)
 137                return -EAFNOSUPPORT;
 138
 139        sock->ops = &pvc_proto_ops;
 140        return vcc_create(net, sock, protocol, PF_ATMPVC, kern);
 141}
 142
 143static const struct net_proto_family pvc_family_ops = {
 144        .family = PF_ATMPVC,
 145        .create = pvc_create,
 146        .owner = THIS_MODULE,
 147};
 148
 149
 150/*
 151 *      Initialize the ATM PVC protocol family
 152 */
 153
 154
 155int __init atmpvc_init(void)
 156{
 157        return sock_register(&pvc_family_ops);
 158}
 159
 160void atmpvc_exit(void)
 161{
 162        sock_unregister(PF_ATMPVC);
 163}
 164