net/atm/pvc.c

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