[PATCH] capable/capability.h (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 <asm/ioctls.h>
22
23 #include "resources.h"
24 #include "signaling.h"          /* for WAITING and sigd_attach */
25 #include "common.h"
26
27
28 static DECLARE_MUTEX(ioctl_mutex);
29 static LIST_HEAD(ioctl_list);
30
31
32 void register_atm_ioctl(struct atm_ioctl *ioctl)
33 {
34         down(&ioctl_mutex);
35         list_add_tail(&ioctl->list, &ioctl_list);
36         up(&ioctl_mutex);
37 }
38
39 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
40 {
41         down(&ioctl_mutex);
42         list_del(&ioctl->list);
43         up(&ioctl_mutex);
44 }
45
46 EXPORT_SYMBOL(register_atm_ioctl);
47 EXPORT_SYMBOL(deregister_atm_ioctl);
48
49 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
50 {
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;
56
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;
64                         }
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:
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                         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;
93                         }
94                         /*
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
100                          */
101                         if (!capable(CAP_SYS_RAWIO)) {
102                                 error = -EPERM;
103                                 goto done;
104                         }
105                         error = sigd_attach(vcc);
106                         if (!error)
107                                 sock->state = SS_CONNECTED;
108                         goto done;
109                 case ATM_SETBACKEND:
110                 case ATM_NEWBACKENDIF:
111                         {
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;
123                                 }
124                         }
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;
136         }
137
138         error = -ENOIOCTLCMD;
139
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;
148                 }
149         }
150         up(&ioctl_mutex);
151
152         if (error != -ENOIOCTLCMD)
153                 goto done;
154
155         error = atm_dev_ioctl(cmd, argp);
156
157 done:
158         return error;
159 }