clip: convert to internal network_device_stats
[linux-2.6.git] / net / atm / ioctl.c
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 #include <net/compat.h>
23
24 #include "resources.h"
25 #include "signaling.h"          /* for WAITING and sigd_attach */
26 #include "common.h"
27
28
29 static DEFINE_MUTEX(ioctl_mutex);
30 static LIST_HEAD(ioctl_list);
31
32
33 void register_atm_ioctl(struct atm_ioctl *ioctl)
34 {
35         mutex_lock(&ioctl_mutex);
36         list_add_tail(&ioctl->list, &ioctl_list);
37         mutex_unlock(&ioctl_mutex);
38 }
39
40 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
41 {
42         mutex_lock(&ioctl_mutex);
43         list_del(&ioctl->list);
44         mutex_unlock(&ioctl_mutex);
45 }
46
47 EXPORT_SYMBOL(register_atm_ioctl);
48 EXPORT_SYMBOL(deregister_atm_ioctl);
49
50 static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg, int compat)
51 {
52         struct sock *sk = sock->sk;
53         struct atm_vcc *vcc;
54         int error;
55         struct list_head * pos;
56         void __user *argp = (void __user *)arg;
57
58         vcc = ATM_SD(sock);
59         switch (cmd) {
60                 case SIOCOUTQ:
61                         if (sock->state != SS_CONNECTED ||
62                             !test_bit(ATM_VF_READY, &vcc->flags)) {
63                                 error =  -EINVAL;
64                                 goto done;
65                         }
66                         error = put_user(sk->sk_sndbuf -
67                                          atomic_read(&sk->sk_wmem_alloc),
68                                          (int __user *) argp) ? -EFAULT : 0;
69                         goto done;
70                 case SIOCINQ:
71                         {
72                                 struct sk_buff *skb;
73
74                                 if (sock->state != SS_CONNECTED) {
75                                         error = -EINVAL;
76                                         goto done;
77                                 }
78                                 skb = skb_peek(&sk->sk_receive_queue);
79                                 error = put_user(skb ? skb->len : 0,
80                                                  (int __user *)argp) ? -EFAULT : 0;
81                                 goto done;
82                         }
83                 case SIOCGSTAMP: /* borrowed from IP */
84 #ifdef CONFIG_COMPAT
85                         if (compat)
86                                 error = compat_sock_get_timestamp(sk, argp);
87                         else
88 #endif
89                                 error = sock_get_timestamp(sk, argp);
90                         goto done;
91                 case SIOCGSTAMPNS: /* borrowed from IP */
92 #ifdef CONFIG_COMPAT
93                         if (compat)
94                                 error = compat_sock_get_timestampns(sk, argp);
95                         else
96 #endif
97                                 error = sock_get_timestampns(sk, argp);
98                         goto done;
99                 case ATM_SETSC:
100                         if (net_ratelimit())
101                                 printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
102                                        current->comm, task_pid_nr(current));
103                         error = 0;
104                         goto done;
105                 case ATMSIGD_CTRL:
106                         if (!capable(CAP_NET_ADMIN)) {
107                                 error = -EPERM;
108                                 goto done;
109                         }
110                         /*
111                          * The user/kernel protocol for exchanging signalling
112                          * info uses kernel pointers as opaque references,
113                          * so the holder of the file descriptor can scribble
114                          * on the kernel... so we should make sure that we
115                          * have the same privileges that /proc/kcore needs
116                          */
117                         if (!capable(CAP_SYS_RAWIO)) {
118                                 error = -EPERM;
119                                 goto done;
120                         }
121 #ifdef CONFIG_COMPAT
122                         /* WTF? I don't even want to _think_ about making this
123                            work for 32-bit userspace. TBH I don't really want
124                            to think about it at all. dwmw2. */
125                         if (compat) {
126                                 if (net_ratelimit())
127                                         printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
128                                 error = -EINVAL;
129                                 goto done;
130                         }
131 #endif
132                         error = sigd_attach(vcc);
133                         if (!error)
134                                 sock->state = SS_CONNECTED;
135                         goto done;
136                 case ATM_SETBACKEND:
137                 case ATM_NEWBACKENDIF:
138                         {
139                                 atm_backend_t backend;
140                                 error = get_user(backend, (atm_backend_t __user *) argp);
141                                 if (error)
142                                         goto done;
143                                 switch (backend) {
144                                         case ATM_BACKEND_PPP:
145                                                 request_module("pppoatm");
146                                                 break;
147                                         case ATM_BACKEND_BR2684:
148                                                 request_module("br2684");
149                                                 break;
150                                 }
151                         }
152                         break;
153                 case ATMMPC_CTRL:
154                 case ATMMPC_DATA:
155                         request_module("mpoa");
156                         break;
157                 case ATMARPD_CTRL:
158                         request_module("clip");
159                         break;
160                 case ATMLEC_CTRL:
161                         request_module("lec");
162                         break;
163         }
164
165         error = -ENOIOCTLCMD;
166
167         mutex_lock(&ioctl_mutex);
168         list_for_each(pos, &ioctl_list) {
169                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
170                 if (try_module_get(ic->owner)) {
171                         error = ic->ioctl(sock, cmd, arg);
172                         module_put(ic->owner);
173                         if (error != -ENOIOCTLCMD)
174                                 break;
175                 }
176         }
177         mutex_unlock(&ioctl_mutex);
178
179         if (error != -ENOIOCTLCMD)
180                 goto done;
181
182         error = atm_dev_ioctl(cmd, argp, compat);
183
184 done:
185         return error;
186 }
187
188
189 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
190 {
191         return do_vcc_ioctl(sock, cmd, arg, 0);
192 }
193
194 #ifdef CONFIG_COMPAT
195 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
196 {
197         return do_vcc_ioctl(sock, cmd, arg, 1);
198 }
199 #endif