[NET] sem2mutex: net/
[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/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 <linux/mutex.h>
22 #include <asm/ioctls.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 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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                         error = sock_get_timestamp(sk, argp);
85                         goto done;
86                 case ATM_SETSC:
87                         printk(KERN_WARNING "ATM_SETSC is obsolete\n");
88                         error = 0;
89                         goto done;
90                 case ATMSIGD_CTRL:
91                         if (!capable(CAP_NET_ADMIN)) {
92                                 error = -EPERM;
93                                 goto done;
94                         }
95                         /*
96                          * The user/kernel protocol for exchanging signalling
97                          * info uses kernel pointers as opaque references,
98                          * so the holder of the file descriptor can scribble
99                          * on the kernel... so we should make sure that we
100                          * have the same privledges that /proc/kcore needs
101                          */
102                         if (!capable(CAP_SYS_RAWIO)) {
103                                 error = -EPERM;
104                                 goto done;
105                         }
106                         error = sigd_attach(vcc);
107                         if (!error)
108                                 sock->state = SS_CONNECTED;
109                         goto done;
110                 case ATM_SETBACKEND:
111                 case ATM_NEWBACKENDIF:
112                         {
113                                 atm_backend_t backend;
114                                 error = get_user(backend, (atm_backend_t __user *) argp);
115                                 if (error)
116                                         goto done;
117                                 switch (backend) {
118                                         case ATM_BACKEND_PPP:
119                                                 request_module("pppoatm");
120                                                 break;
121                                         case ATM_BACKEND_BR2684:
122                                                 request_module("br2684");
123                                                 break;
124                                 }
125                         }
126                         break;
127                 case ATMMPC_CTRL:
128                 case ATMMPC_DATA:
129                         request_module("mpoa");
130                         break;
131                 case ATMARPD_CTRL:
132                         request_module("clip");
133                         break;
134                 case ATMLEC_CTRL:
135                         request_module("lec");
136                         break;
137         }
138
139         error = -ENOIOCTLCMD;
140
141         mutex_lock(&ioctl_mutex);
142         list_for_each(pos, &ioctl_list) {
143                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
144                 if (try_module_get(ic->owner)) {
145                         error = ic->ioctl(sock, cmd, arg);
146                         module_put(ic->owner);
147                         if (error != -ENOIOCTLCMD)
148                                 break;
149                 }
150         }
151         mutex_unlock(&ioctl_mutex);
152
153         if (error != -ENOIOCTLCMD)
154                 goto done;
155
156         error = atm_dev_ioctl(cmd, argp);
157
158 done:
159         return error;
160 }