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gerrit-public.fairphone.software / fp2-dev / kernel / msm / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / net / atm / ioctl.c
blob: 4dbb5af34a5ed6bb67fae64501d96cbe04147593 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]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
25
26static DECLARE_MUTEX(ioctl_mutex);
27static LIST_HEAD(ioctl_list);
28
29
30void register_atm_ioctl(struct atm_ioctl *ioctl)
31{
32 down(&ioctl_mutex);
33 list_add_tail(&ioctl->list, &ioctl_list);
34 up(&ioctl_mutex);
35}
36
37void deregister_atm_ioctl(struct atm_ioctl *ioctl)
38{
39 down(&ioctl_mutex);
40 list_del(&ioctl->list);
41 up(&ioctl_mutex);
42}
43
44EXPORT_SYMBOL(register_atm_ioctl);
45EXPORT_SYMBOL(deregister_atm_ioctl);
46
47int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
48{
49 struct sock *sk = sock->sk;
50 struct atm_vcc *vcc;
51 int error;
52 struct list_head * pos;
53 void __user *argp = (void __user *)arg;
54
55 vcc = ATM_SD(sock);
56 switch (cmd) {
57 case SIOCOUTQ:
58 if (sock->state != SS_CONNECTED ||
59 !test_bit(ATM_VF_READY, &vcc->flags)) {
60 error = -EINVAL;
61 goto done;
62 }
63 error = put_user(sk->sk_sndbuf -
64 atomic_read(&sk->sk_wmem_alloc),
65 (int __user *) argp) ? -EFAULT : 0;
66 goto done;
67 case SIOCINQ:
68 {
69 struct sk_buff *skb;
70
71 if (sock->state != SS_CONNECTED) {
72 error = -EINVAL;
73 goto done;
74 }
75 skb = skb_peek(&sk->sk_receive_queue);
76 error = put_user(skb ? skb->len : 0,
77 (int __user *)argp) ? -EFAULT : 0;
78 goto done;
79 }
80 case SIOCGSTAMP: /* borrowed from IP */
81 error = sock_get_timestamp(sk, argp);
82 goto done;
83 case ATM_SETSC:
84 printk(KERN_WARNING "ATM_SETSC is obsolete\n");
85 error = 0;
86 goto done;
87 case ATMSIGD_CTRL:
88 if (!capable(CAP_NET_ADMIN)) {
89 error = -EPERM;
90 goto done;
91 }
92 /*
93 * The user/kernel protocol for exchanging signalling
94 * info uses kernel pointers as opaque references,
95 * so the holder of the file descriptor can scribble
96 * on the kernel... so we should make sure that we
97 * have the same privledges that /proc/kcore needs
98 */
99 if (!capable(CAP_SYS_RAWIO)) {
100 error = -EPERM;
101 goto done;
102 }
103 error = sigd_attach(vcc);
104 if (!error)
105 sock->state = SS_CONNECTED;
106 goto done;
107 default:
108 break;
109 }
110
111 if (cmd == ATMMPC_CTRL || cmd == ATMMPC_DATA)
112 request_module("mpoa");
113 if (cmd == ATMARPD_CTRL)
114 request_module("clip");
115 if (cmd == ATMLEC_CTRL)
116 request_module("lec");
117
118 error = -ENOIOCTLCMD;
119
120 down(&ioctl_mutex);
121 list_for_each(pos, &ioctl_list) {
122 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
123 if (try_module_get(ic->owner)) {
124 error = ic->ioctl(sock, cmd, arg);
125 module_put(ic->owner);
126 if (error != -ENOIOCTLCMD)
127 break;
128 }
129 }
130 up(&ioctl_mutex);
131
132 if (error != -ENOIOCTLCMD)
133 goto done;
134
135 error = atm_dev_ioctl(cmd, argp);
136
137done:
138 return error;
139}