xref: /openbmc/linux/net/atm/ioctl.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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85 			printk(KERN_WARNING "ATM_SETSC is obsolete\n");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 		case ATM_SETBACKEND:
109 		case ATM_NEWBACKENDIF:
110 			{
111 				atm_backend_t backend;
112 				error = get_user(backend, (atm_backend_t __user *) argp);
113 				if (error)
114 					goto done;
115 				switch (backend) {
116 					case ATM_BACKEND_PPP:
117 						request_module("pppoatm");
118 						break;
119 					case ATM_BACKEND_BR2684:
120 						request_module("br2684");
121 						break;
122 				}
123 			}
124 			break;
125 		case ATMMPC_CTRL:
126 		case ATMMPC_DATA:
127 			request_module("mpoa");
128 			break;
129 		case ATMARPD_CTRL:
130 			request_module("clip");
131 			break;
132 		case ATMLEC_CTRL:
133 			request_module("lec");
134 			break;
135 	}
136 
137 	error = -ENOIOCTLCMD;
138 
139 	down(&ioctl_mutex);
140 	list_for_each(pos, &ioctl_list) {
141 		struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
142 		if (try_module_get(ic->owner)) {
143 			error = ic->ioctl(sock, cmd, arg);
144 			module_put(ic->owner);
145 			if (error != -ENOIOCTLCMD)
146 				break;
147 		}
148 	}
149 	up(&ioctl_mutex);
150 
151 	if (error != -ENOIOCTLCMD)
152 		goto done;
153 
154 	error = atm_dev_ioctl(cmd, argp);
155 
156 done:
157 	return error;
158 }
159