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TOMOYO Linux Cross Reference
Linux/net/atm/pvc.c

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  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                           char __user *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         .listen =       sock_no_listen,
122         .shutdown =     pvc_shutdown,
123         .setsockopt =   pvc_setsockopt,
124         .getsockopt =   pvc_getsockopt,
125         .sendmsg =      vcc_sendmsg,
126         .recvmsg =      vcc_recvmsg,
127         .mmap =         sock_no_mmap,
128         .sendpage =     sock_no_sendpage,
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 }
163 

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