[ARM] Support register switch in nommu mode
[linux-2.6/verdex.git] / net / atm / ioctl.c
blobeb109af7eb4a45b2cffef7aec1b2b146b6ea733b
1 /* ATM ioctl handling */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4 /* 2003 John Levon <levon@movementarian.org> */
7 #include <linux/config.h>
8 #include <linux/module.h>
9 #include <linux/kmod.h>
10 #include <linux/net.h> /* struct socket, struct proto_ops */
11 #include <linux/atm.h> /* ATM stuff */
12 #include <linux/atmdev.h>
13 #include <linux/atmclip.h> /* CLIP_*ENCAP */
14 #include <linux/atmarp.h> /* manifest constants */
15 #include <linux/capability.h>
16 #include <linux/sonet.h> /* for ioctls */
17 #include <linux/atmsvc.h>
18 #include <linux/atmmpc.h>
19 #include <net/atmclip.h>
20 #include <linux/atmlec.h>
21 #include <asm/ioctls.h>
23 #include "resources.h"
24 #include "signaling.h" /* for WAITING and sigd_attach */
25 #include "common.h"
28 static DECLARE_MUTEX(ioctl_mutex);
29 static LIST_HEAD(ioctl_list);
32 void register_atm_ioctl(struct atm_ioctl *ioctl)
34 down(&ioctl_mutex);
35 list_add_tail(&ioctl->list, &ioctl_list);
36 up(&ioctl_mutex);
39 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
41 down(&ioctl_mutex);
42 list_del(&ioctl->list);
43 up(&ioctl_mutex);
46 EXPORT_SYMBOL(register_atm_ioctl);
47 EXPORT_SYMBOL(deregister_atm_ioctl);
49 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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;
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;
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:
71 struct sk_buff *skb;
73 if (sock->state != SS_CONNECTED) {
74 error = -EINVAL;
75 goto done;
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;
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86 printk(KERN_WARNING "ATM_SETSC is obsolete\n");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;
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
101 if (!capable(CAP_SYS_RAWIO)) {
102 error = -EPERM;
103 goto done;
105 error = sigd_attach(vcc);
106 if (!error)
107 sock->state = SS_CONNECTED;
108 goto done;
109 case ATM_SETBACKEND:
110 case ATM_NEWBACKENDIF:
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;
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");
135 break;
138 error = -ENOIOCTLCMD;
140 down(&ioctl_mutex);
141 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;
150 up(&ioctl_mutex);
152 if (error != -ENOIOCTLCMD)
153 goto done;
155 error = atm_dev_ioctl(cmd, argp);
157 done:
158 return error;