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};
130
131
132static 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
142static 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
154int __init atmpvc_init(void)
155{
156	return sock_register(&pvc_family_ops);
157}
158
159void atmpvc_exit(void)
160{
161	sock_unregister(PF_ATMPVC);
162}
163