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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ATM ioctl handling */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4/* 2003 John Levon <levon@movementarian.org> */
5
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#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 */
Randy Dunlap4fc268d2006-01-11 12:17:47 -080014#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#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>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080020#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/ioctls.h>
22
23#include "resources.h"
24#include "signaling.h" /* for WAITING and sigd_attach */
Adrian Bunk295098e2005-09-05 18:04:28 -070025#include "common.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080028static DEFINE_MUTEX(ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static LIST_HEAD(ioctl_list);
30
31
32void register_atm_ioctl(struct atm_ioctl *ioctl)
33{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080034 mutex_lock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 list_add_tail(&ioctl->list, &ioctl_list);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080036 mutex_unlock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037}
38
39void deregister_atm_ioctl(struct atm_ioctl *ioctl)
40{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080041 mutex_lock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 list_del(&ioctl->list);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080043 mutex_unlock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
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 ATM_SETSC:
86 printk(KERN_WARNING "ATM_SETSC is obsolete\n");
87 error = 0;
88 goto done;
89 case ATMSIGD_CTRL:
90 if (!capable(CAP_NET_ADMIN)) {
91 error = -EPERM;
92 goto done;
93 }
94 /*
95 * The user/kernel protocol for exchanging signalling
96 * info uses kernel pointers as opaque references,
97 * so the holder of the file descriptor can scribble
98 * on the kernel... so we should make sure that we
99 * have the same privledges that /proc/kcore needs
100 */
101 if (!capable(CAP_SYS_RAWIO)) {
102 error = -EPERM;
103 goto done;
104 }
105 error = sigd_attach(vcc);
106 if (!error)
107 sock->state = SS_CONNECTED;
108 goto done;
Roman Kagane2c4b722005-09-28 16:34:24 -0700109 case ATM_SETBACKEND:
110 case ATM_NEWBACKENDIF:
111 {
112 atm_backend_t backend;
113 error = get_user(backend, (atm_backend_t __user *) argp);
114 if (error)
115 goto done;
116 switch (backend) {
117 case ATM_BACKEND_PPP:
118 request_module("pppoatm");
119 break;
120 case ATM_BACKEND_BR2684:
121 request_module("br2684");
122 break;
123 }
124 }
125 break;
126 case ATMMPC_CTRL:
127 case ATMMPC_DATA:
128 request_module("mpoa");
129 break;
130 case ATMARPD_CTRL:
131 request_module("clip");
132 break;
133 case ATMLEC_CTRL:
134 request_module("lec");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 break;
136 }
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 error = -ENOIOCTLCMD;
139
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800140 mutex_lock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 list_for_each(pos, &ioctl_list) {
142 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
143 if (try_module_get(ic->owner)) {
144 error = ic->ioctl(sock, cmd, arg);
145 module_put(ic->owner);
146 if (error != -ENOIOCTLCMD)
147 break;
148 }
149 }
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800150 mutex_unlock(&ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 if (error != -ENOIOCTLCMD)
153 goto done;
154
155 error = atm_dev_ioctl(cmd, argp);
156
157done:
158 return error;
159}