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 
pvc_shutdown(struct socket * sock,int how)22 static int pvc_shutdown(struct socket *sock, int how)
23 {
24 	return 0;
25 }
26 
pvc_bind(struct socket * sock,struct sockaddr * sockaddr,int sockaddr_len)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 
pvc_connect(struct socket * sock,struct sockaddr * sockaddr,int sockaddr_len,int flags)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 
pvc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)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 
pvc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)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 
pvc_getname(struct socket * sock,struct sockaddr * sockaddr,int peer)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 
pvc_create(struct net * net,struct socket * sock,int protocol,int kern)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 
atmpvc_init(void)154 int __init atmpvc_init(void)
155 {
156 	return sock_register(&pvc_family_ops);
157 }
158 
atmpvc_exit(void)159 void atmpvc_exit(void)
160 {
161 	sock_unregister(PF_ATMPVC);
162 }
163