[ATM]: net/atm/ioctl.c should #include "common.h"
[linux-2.6] / 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/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 <asm/ioctls.h>
21
22 #include "resources.h"
23 #include "signaling.h"          /* for WAITING and sigd_attach */
24 #include "common.h"
25
26
27 static DECLARE_MUTEX(ioctl_mutex);
28 static LIST_HEAD(ioctl_list);
29
30
31 void register_atm_ioctl(struct atm_ioctl *ioctl)
32 {
33         down(&ioctl_mutex);
34         list_add_tail(&ioctl->list, &ioctl_list);
35         up(&ioctl_mutex);
36 }
37
38 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
39 {
40         down(&ioctl_mutex);
41         list_del(&ioctl->list);
42         up(&ioctl_mutex);
43 }
44
45 EXPORT_SYMBOL(register_atm_ioctl);
46 EXPORT_SYMBOL(deregister_atm_ioctl);
47
48 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
49 {
50         struct sock *sk = sock->sk;
51         struct atm_vcc *vcc;
52         int error;
53         struct list_head * pos;
54         void __user *argp = (void __user *)arg;
55
56         vcc = ATM_SD(sock);
57         switch (cmd) {
58                 case SIOCOUTQ:
59                         if (sock->state != SS_CONNECTED ||
60                             !test_bit(ATM_VF_READY, &vcc->flags)) {
61                                 error =  -EINVAL;
62                                 goto done;
63                         }
64                         error = put_user(sk->sk_sndbuf -
65                                          atomic_read(&sk->sk_wmem_alloc),
66                                          (int __user *) argp) ? -EFAULT : 0;
67                         goto done;
68                 case SIOCINQ:
69                         {
70                                 struct sk_buff *skb;
71
72                                 if (sock->state != SS_CONNECTED) {
73                                         error = -EINVAL;
74                                         goto done;
75                                 }
76                                 skb = skb_peek(&sk->sk_receive_queue);
77                                 error = put_user(skb ? skb->len : 0,
78                                                  (int __user *)argp) ? -EFAULT : 0;
79                                 goto done;
80                         }
81                 case SIOCGSTAMP: /* borrowed from IP */
82                         error = sock_get_timestamp(sk, argp);
83                         goto done;
84                 case ATM_SETSC:
85                         printk(KERN_WARNING "ATM_SETSC is obsolete\n");
86                         error = 0;
87                         goto done;
88                 case ATMSIGD_CTRL:
89                         if (!capable(CAP_NET_ADMIN)) {
90                                 error = -EPERM;
91                                 goto done;
92                         }
93                         /*
94                          * The user/kernel protocol for exchanging signalling
95                          * info uses kernel pointers as opaque references,
96                          * so the holder of the file descriptor can scribble
97                          * on the kernel... so we should make sure that we
98                          * have the same privledges that /proc/kcore needs
99                          */
100                         if (!capable(CAP_SYS_RAWIO)) {
101                                 error = -EPERM;
102                                 goto done;
103                         }
104                         error = sigd_attach(vcc);
105                         if (!error)
106                                 sock->state = SS_CONNECTED;
107                         goto done;
108                 default:
109                         break;
110         }
111
112         if (cmd == ATMMPC_CTRL || cmd == ATMMPC_DATA)
113                 request_module("mpoa");
114         if (cmd == ATMARPD_CTRL)
115                 request_module("clip");
116         if (cmd == ATMLEC_CTRL)
117                 request_module("lec");
118
119         error = -ENOIOCTLCMD;
120
121         down(&ioctl_mutex);
122         list_for_each(pos, &ioctl_list) {
123                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
124                 if (try_module_get(ic->owner)) {
125                         error = ic->ioctl(sock, cmd, arg);
126                         module_put(ic->owner);
127                         if (error != -ENOIOCTLCMD)
128                                 break;
129                 }
130         }
131         up(&ioctl_mutex);
132
133         if (error != -ENOIOCTLCMD)
134                 goto done;
135
136         error = atm_dev_ioctl(cmd, argp);
137
138 done:
139         return error;
140 }