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 }
163
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