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
  22 static int pvc_shutdown(struct socket *sock, int how)
  23 {
  24         return 0;
  25 }
  26
  27 static 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);
  54 out:
  55         release_sock(sk);
  56         return error;
  57 }
  58
  59 static 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
  65 static 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
  77 static 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
  89 static 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
 106 static 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 };
 130
 131
 132 static int pvc_create(struct net *net, struct socket *sock, int protocol,
 133                       int kern)
 134 {
 135         if (net != &init_net)
 136                 return -EAFNOSUPPORT;
 137
 138         sock->ops = &pvc_proto_ops;
 139         return vcc_create(net, sock, protocol, PF_ATMPVC, kern);
 140 }
 141
 142 static const struct net_proto_family pvc_family_ops = {
 143         .family = PF_ATMPVC,
 144         .create = pvc_create,
 145         .owner = THIS_MODULE,
 146 };
 147
 148
 149 /*
 150  *      Initialize the ATM PVC protocol family
 151  */
 152
 153
 154 int __init atmpvc_init(void)
 155 {
 156         return sock_register(&pvc_family_ops);
 157 }
 158
 159 void atmpvc_exit(void)
 160 {
 161         sock_unregister(PF_ATMPVC);
 162 }