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
23 #include "resources.h"
24 #include "signaling.h" /* for WAITING and sigd_attach */
25 #include "common.h"
26
27
28 static DEFINE_MUTEX(ioctl_mutex);
29 static LIST_HEAD(ioctl_list);
30
31
32 void register_atm_ioctl(struct atm_ioctl *ioctl)
33 {
34 mutex_lock(&ioctl_mutex);
35 list_add_tail(&ioctl->list, &ioctl_list);
36 mutex_unlock(&ioctl_mutex);
37 }
38
39 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
40 {
41 mutex_lock(&ioctl_mutex);
42 list_del(&ioctl->list);
43 mutex_unlock(&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 SIOCGSTAMPNS: /* borrowed from IP */
86 error = sock_get_timestampns(sk, argp);
87 goto done;
88 case ATM_SETSC:
89 printk(KERN_WARNING "ATM_SETSC is obsolete\n");
90 error = 0;
91 goto done;
92 case ATMSIGD_CTRL:
93 if (!capable(CAP_NET_ADMIN)) {
94 error = -EPERM;
95 goto done;
96 }
97 /*
98 * The user/kernel protocol for exchanging signalling
99 * info uses kernel pointers as opaque references,
100 * so the holder of the file descriptor can scribble
101 * on the kernel... so we should make sure that we
102 * have the same privledges that /proc/kcore needs
103 */
104 if (!capable(CAP_SYS_RAWIO)) {
105 error = -EPERM;
106 goto done;
107 }
108 error = sigd_attach(vcc);
109 if (!error)
110 sock->state = SS_CONNECTED;
111 goto done;
112 case ATM_SETBACKEND:
113 case ATM_NEWBACKENDIF:
114 {
115 atm_backend_t backend;
116 error = get_user(backend, (atm_backend_t __user *) argp);
117 if (error)
118 goto done;
119 switch (backend) {
120 case ATM_BACKEND_PPP:
121 request_module("pppoatm");
122 break;
123 case ATM_BACKEND_BR2684:
124 request_module("br2684");
125 break;
126 }
127 }
128 break;
129 case ATMMPC_CTRL:
130 case ATMMPC_DATA:
131 request_module("mpoa");
132 break;
133 case ATMARPD_CTRL:
134 request_module("clip");
135 break;
136 case ATMLEC_CTRL:
137 request_module("lec");
138 break;
139 }
140
141 error = -ENOIOCTLCMD;
142
143 mutex_lock(&ioctl_mutex);
144 list_for_each(pos, &ioctl_list) {
145 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
146 if (try_module_get(ic->owner)) {
147 error = ic->ioctl(sock, cmd, arg);
148 module_put(ic->owner);
149 if (error != -ENOIOCTLCMD)
150 break;
151 }
152 }
153 mutex_unlock(&ioctl_mutex);
154
155 if (error != -ENOIOCTLCMD)
156 goto done;
157
158 error = atm_dev_ioctl(cmd, argp);
159
160 done:
161 return error;
162 }
163
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