Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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 - sk_wmem_alloc_get(sk),
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 #ifdef CONFIG_COMPAT
84                         if (compat)
85                                 error = compat_sock_get_timestamp(sk, argp);
86                         else
87 #endif
88                                 error = sock_get_timestamp(sk, argp);
89                         goto done;
90                 case SIOCGSTAMPNS: /* borrowed from IP */
91 #ifdef CONFIG_COMPAT
92                         if (compat)
93                                 error = compat_sock_get_timestampns(sk, argp);
94                         else
95 #endif
96                                 error = sock_get_timestampns(sk, argp);
97                         goto done;
98                 case ATM_SETSC:
99                         if (net_ratelimit())
100                                 printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
101                                        current->comm, task_pid_nr(current));
102                         error = 0;
103                         goto done;
104                 case ATMSIGD_CTRL:
105                         if (!capable(CAP_NET_ADMIN)) {
106                                 error = -EPERM;
107                                 goto done;
108                         }
109                         /*
110                          * The user/kernel protocol for exchanging signalling
111                          * info uses kernel pointers as opaque references,
112                          * so the holder of the file descriptor can scribble
113                          * on the kernel... so we should make sure that we
114                          * have the same privileges that /proc/kcore needs
115                          */
116                         if (!capable(CAP_SYS_RAWIO)) {
117                                 error = -EPERM;
118                                 goto done;
119                         }
120 #ifdef CONFIG_COMPAT
121                         /* WTF? I don't even want to _think_ about making this
122                            work for 32-bit userspace. TBH I don't really want
123                            to think about it at all. dwmw2. */
124                         if (compat) {
125                                 if (net_ratelimit())
126                                         printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
127                                 error = -EINVAL;
128                                 goto done;
129                         }
130 #endif
131                         error = sigd_attach(vcc);
132                         if (!error)
133                                 sock->state = SS_CONNECTED;
134                         goto done;
135                 case ATM_SETBACKEND:
136                 case ATM_NEWBACKENDIF:
137                         {
138                                 atm_backend_t backend;
139                                 error = get_user(backend, (atm_backend_t __user *) argp);
140                                 if (error)
141                                         goto done;
142                                 switch (backend) {
143                                         case ATM_BACKEND_PPP:
144                                                 request_module("pppoatm");
145                                                 break;
146                                         case ATM_BACKEND_BR2684:
147                                                 request_module("br2684");
148                                                 break;
149                                 }
150                         }
151                         break;
152                 case ATMMPC_CTRL:
153                 case ATMMPC_DATA:
154                         request_module("mpoa");
155                         break;
156                 case ATMARPD_CTRL:
157                         request_module("clip");
158                         break;
159                 case ATMLEC_CTRL:
160                         request_module("lec");
161                         break;
162         }
163
164         error = -ENOIOCTLCMD;
165
166         mutex_lock(&ioctl_mutex);
167         list_for_each(pos, &ioctl_list) {
168                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
169                 if (try_module_get(ic->owner)) {
170                         error = ic->ioctl(sock, cmd, arg);
171                         module_put(ic->owner);
172                         if (error != -ENOIOCTLCMD)
173                                 break;
174                 }
175         }
176         mutex_unlock(&ioctl_mutex);
177
178         if (error != -ENOIOCTLCMD)
179                 goto done;
180
181         error = atm_dev_ioctl(cmd, argp, compat);
182
183 done:
184         return error;
185 }
186
187
188 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
189 {
190         return do_vcc_ioctl(sock, cmd, arg, 0);
191 }
192
193 #ifdef CONFIG_COMPAT
194 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
195 {
196         return do_vcc_ioctl(sock, cmd, arg, 1);
197 }
198 #endif