1/* ATM ioctl handling */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4/* 2003 John Levon  <levon@movementarian.org> */
5
6
7#include <linux/module.h>
8#include <linux/kmod.h>
9#include <linux/net.h>		/* struct socket, struct proto_ops */
10#include <linux/atm.h>		/* ATM stuff */
11#include <linux/atmdev.h>
12#include <linux/atmclip.h>	/* CLIP_*ENCAP */
13#include <linux/atmarp.h>	/* manifest constants */
14#include <linux/capability.h>
15#include <linux/sonet.h>	/* for ioctls */
16#include <linux/atmsvc.h>
17#include <linux/atmmpc.h>
18#include <net/atmclip.h>
19#include <linux/atmlec.h>
20#include <linux/mutex.h>
21#include <asm/ioctls.h>
22
23#include "resources.h"
24#include "signaling.h"		/* for WAITING and sigd_attach */
25#include "common.h"
26
27
28static DEFINE_MUTEX(ioctl_mutex);
29static LIST_HEAD(ioctl_list);
30
31
32void register_atm_ioctl(struct atm_ioctl *ioctl)
33{
34	mutex_lock(&ioctl_mutex);
35	list_add_tail(&ioctl->list, &ioctl_list);
36	mutex_unlock(&ioctl_mutex);
37}
38
39void deregister_atm_ioctl(struct atm_ioctl *ioctl)
40{
41	mutex_lock(&ioctl_mutex);
42	list_del(&ioctl->list);
43	mutex_unlock(&ioctl_mutex);
44}
45
46EXPORT_SYMBOL(register_atm_ioctl);
47EXPORT_SYMBOL(deregister_atm_ioctl);
48
49int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
50{
51	struct sock *sk = sock->sk;
52	struct atm_vcc *vcc;
53	int error;
54	struct list_head * pos;
55	void __user *argp = (void __user *)arg;
56
57	vcc = ATM_SD(sock);
58	switch (cmd) {
59		case SIOCOUTQ:
60			if (sock->state != SS_CONNECTED ||
61			    !test_bit(ATM_VF_READY, &vcc->flags)) {
62				error =  -EINVAL;
63				goto done;
64			}
65			error = put_user(sk->sk_sndbuf -
66					 atomic_read(&sk->sk_wmem_alloc),
67					 (int __user *) argp) ? -EFAULT : 0;
68			goto done;
69		case SIOCINQ:
70			{
71				struct sk_buff *skb;
72
73				if (sock->state != SS_CONNECTED) {
74					error = -EINVAL;
75					goto done;
76				}
77				skb = skb_peek(&sk->sk_receive_queue);
78				error = put_user(skb ? skb->len : 0,
79						 (int __user *)argp) ? -EFAULT : 0;
80				goto done;
81			}
82		case SIOCGSTAMP: /* borrowed from IP */
83			error = sock_get_timestamp(sk, argp);
84			goto done;
85		case SIOCGSTAMPNS: /* borrowed from IP */
86			error = sock_get_timestampns(sk, argp);
87			goto done;
88		case ATM_SETSC:
89			printk(KERN_WARNING "ATM_SETSC is obsolete\n");
90			error = 0;
91			goto done;
92		case ATMSIGD_CTRL:
93			if (!capable(CAP_NET_ADMIN)) {
94				error = -EPERM;
95				goto done;
96			}
97			/*
98			 * The user/kernel protocol for exchanging signalling
99			 * info uses kernel pointers as opaque references,
100			 * so the holder of the file descriptor can scribble
101			 * on the kernel... so we should make sure that we
102			 * have the same privledges that /proc/kcore needs
103			 */
104			if (!capable(CAP_SYS_RAWIO)) {
105				error = -EPERM;
106				goto done;
107			}
108			error = sigd_attach(vcc);
109			if (!error)
110				sock->state = SS_CONNECTED;
111			goto done;
112		case ATM_SETBACKEND:
113		case ATM_NEWBACKENDIF:
114			{
115				atm_backend_t backend;
116				error = get_user(backend, (atm_backend_t __user *) argp);
117				if (error)
118					goto done;
119				switch (backend) {
120					case ATM_BACKEND_PPP:
121						request_module("pppoatm");
122						break;
123					case ATM_BACKEND_BR2684:
124						request_module("br2684");
125						break;
126				}
127			}
128			break;
129		case ATMMPC_CTRL:
130		case ATMMPC_DATA:
131			request_module("mpoa");
132			break;
133		case ATMARPD_CTRL:
134			request_module("clip");
135			break;
136		case ATMLEC_CTRL:
137			request_module("lec");
138			break;
139	}
140
141	error = -ENOIOCTLCMD;
142
143	mutex_lock(&ioctl_mutex);
144	list_for_each(pos, &ioctl_list) {
145		struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
146		if (try_module_get(ic->owner)) {
147			error = ic->ioctl(sock, cmd, arg);
148			module_put(ic->owner);
149			if (error != -ENOIOCTLCMD)
150				break;
151		}
152	}
153	mutex_unlock(&ioctl_mutex);
154
155	if (error != -ENOIOCTLCMD)
156		goto done;
157
158	error = atm_dev_ioctl(cmd, argp);
159
160done:
161	return error;
162}
163