[deliverable/linux.git] / net / atm / ioctl.c

/* ATM ioctl handling */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
/* 2003 John Levon  <levon@movementarian.org> */


#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/net.h>		/* struct socket, struct proto_ops */
#include <linux/atm.h>		/* ATM stuff */
#include <linux/atmdev.h>
#include <linux/atmclip.h>	/* CLIP_*ENCAP */
#include <linux/atmarp.h>	/* manifest constants */
#include <linux/capability.h>
#include <linux/sonet.h>	/* for ioctls */
#include <linux/atmsvc.h>
#include <linux/atmmpc.h>
#include <net/atmclip.h>
#include <linux/atmlec.h>
#include <linux/mutex.h>
#include <asm/ioctls.h>
#include <net/compat.h>

#include "resources.h"
#include "signaling.h"		/* for WAITING and sigd_attach */
#include "common.h"


static DEFINE_MUTEX(ioctl_mutex);
static LIST_HEAD(ioctl_list);


void register_atm_ioctl(struct atm_ioctl *ioctl)
{
	mutex_lock(&ioctl_mutex);
	list_add_tail(&ioctl->list, &ioctl_list);
	mutex_unlock(&ioctl_mutex);
}

void deregister_atm_ioctl(struct atm_ioctl *ioctl)
{
	mutex_lock(&ioctl_mutex);
	list_del(&ioctl->list);
	mutex_unlock(&ioctl_mutex);
}

EXPORT_SYMBOL(register_atm_ioctl);
EXPORT_SYMBOL(deregister_atm_ioctl);

static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg, int compat)
{
	struct sock *sk = sock->sk;
	struct atm_vcc *vcc;
	int error;
	struct list_head * pos;
	void __user *argp = (void __user *)arg;

	vcc = ATM_SD(sock);
	switch (cmd) {
		case SIOCOUTQ:
			if (sock->state != SS_CONNECTED ||
			    !test_bit(ATM_VF_READY, &vcc->flags)) {
				error =  -EINVAL;
				goto done;
			}
			error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
					 (int __user *) argp) ? -EFAULT : 0;
			goto done;
		case SIOCINQ:
			{
				struct sk_buff *skb;

				if (sock->state != SS_CONNECTED) {
					error = -EINVAL;
					goto done;
				}
				skb = skb_peek(&sk->sk_receive_queue);
				error = put_user(skb ? skb->len : 0,
						 (int __user *)argp) ? -EFAULT : 0;
				goto done;
			}
		case SIOCGSTAMP: /* borrowed from IP */
#ifdef CONFIG_COMPAT
			if (compat)
				error = compat_sock_get_timestamp(sk, argp);
			else
#endif
				error = sock_get_timestamp(sk, argp);
			goto done;
		case SIOCGSTAMPNS: /* borrowed from IP */
#ifdef CONFIG_COMPAT
			if (compat)
				error = compat_sock_get_timestampns(sk, argp);
			else
#endif
				error = sock_get_timestampns(sk, argp);
			goto done;
		case ATM_SETSC:
			if (net_ratelimit())
				printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
				       current->comm, task_pid_nr(current));
			error = 0;
			goto done;
		case ATMSIGD_CTRL:
			if (!capable(CAP_NET_ADMIN)) {
				error = -EPERM;
				goto done;
			}
			/*
			 * The user/kernel protocol for exchanging signalling
			 * info uses kernel pointers as opaque references,
			 * so the holder of the file descriptor can scribble
			 * on the kernel... so we should make sure that we
			 * have the same privileges that /proc/kcore needs
			 */
			if (!capable(CAP_SYS_RAWIO)) {
				error = -EPERM;
				goto done;
			}
#ifdef CONFIG_COMPAT
			/* WTF? I don't even want to _think_ about making this
			   work for 32-bit userspace. TBH I don't really want
			   to think about it at all. dwmw2. */
			if (compat) {
				if (net_ratelimit())
					printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
				error = -EINVAL;
				goto done;
			}
#endif
			error = sigd_attach(vcc);
			if (!error)
				sock->state = SS_CONNECTED;
			goto done;
		case ATM_SETBACKEND:
		case ATM_NEWBACKENDIF:
			{
				atm_backend_t backend;
				error = get_user(backend, (atm_backend_t __user *) argp);
				if (error)
					goto done;
				switch (backend) {
					case ATM_BACKEND_PPP:
						request_module("pppoatm");
						break;
					case ATM_BACKEND_BR2684:
						request_module("br2684");
						break;
				}
			}
			break;
		case ATMMPC_CTRL:
		case ATMMPC_DATA:
			request_module("mpoa");
			break;
		case ATMARPD_CTRL:
			request_module("clip");
			break;
		case ATMLEC_CTRL:
			request_module("lec");
			break;
	}

	error = -ENOIOCTLCMD;

	mutex_lock(&ioctl_mutex);
	list_for_each(pos, &ioctl_list) {
		struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
		if (try_module_get(ic->owner)) {
			error = ic->ioctl(sock, cmd, arg);
			module_put(ic->owner);
			if (error != -ENOIOCTLCMD)
				break;
		}
	}
	mutex_unlock(&ioctl_mutex);

	if (error != -ENOIOCTLCMD)
		goto done;

	error = atm_dev_ioctl(cmd, argp, compat);

done:
	return error;
}


int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return do_vcc_ioctl(sock, cmd, arg, 0);
}

#ifdef CONFIG_COMPAT
int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return do_vcc_ioctl(sock, cmd, arg, 1);
}
#endif
Commit	Line	Data
1da177e4 LT	1	/* ATM ioctl handling */
	2
	3	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	4	/* 2003 John Levon <levon@movementarian.org> */
	5
	6
1da177e4 LT	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 */
4fc268d2	14	#include <linux/capability.h>
1da177e4 LT	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>
4a3e2f71	20	#include <linux/mutex.h>
1da177e4	21	#include <asm/ioctls.h>
8865c418	22	#include <net/compat.h>
1da177e4 LT	23
	24	#include "resources.h"
	25	#include "signaling.h" /* for WAITING and sigd_attach */
295098e9	26	#include "common.h"
1da177e4 LT	27
1da177e4 LT	28
4a3e2f71	29	static DEFINE_MUTEX(ioctl_mutex);
1da177e4 LT	30	static LIST_HEAD(ioctl_list);
	31
	32
	33	void register_atm_ioctl(struct atm_ioctl *ioctl)
	34	{
4a3e2f71	35	mutex_lock(&ioctl_mutex);
1da177e4	36	list_add_tail(&ioctl->list, &ioctl_list);
4a3e2f71	37	mutex_unlock(&ioctl_mutex);
1da177e4 LT	38	}
	39
	40	void deregister_atm_ioctl(struct atm_ioctl *ioctl)
	41	{
4a3e2f71	42	mutex_lock(&ioctl_mutex);
1da177e4	43	list_del(&ioctl->list);
4a3e2f71	44	mutex_unlock(&ioctl_mutex);
1da177e4 LT	45	}
	46
	47	EXPORT_SYMBOL(register_atm_ioctl);
	48	EXPORT_SYMBOL(deregister_atm_ioctl);
	49
8865c418	50	static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg, int compat)
1da177e4 LT	51	{
	52	struct sock *sk = sock->sk;
	53	struct atm_vcc *vcc;
	54	int error;
	55	struct list_head * pos;
	56	void __user argp = (void __user )arg;
	57
	58	vcc = ATM_SD(sock);
	59	switch (cmd) {
	60	case SIOCOUTQ:
	61	if (sock->state != SS_CONNECTED \|\|
	62	!test_bit(ATM_VF_READY, &vcc->flags)) {
	63	error = -EINVAL;
	64	goto done;
	65	}
81e2a3d5	66	error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
1da177e4 LT	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,
f7d57453	79	(int __user *)argp) ? -EFAULT : 0;
1da177e4 LT	80	goto done;
	81	}
	82	case SIOCGSTAMP: /* borrowed from IP */
8865c418 DW	83	#ifdef CONFIG_COMPAT
	84	if (compat)
	85	error = compat_sock_get_timestamp(sk, argp);
	86	else
	87	#endif
	88	error = sock_get_timestamp(sk, argp);
1da177e4	89	goto done;
ae40eb1e	90	case SIOCGSTAMPNS: /* borrowed from IP */
8865c418 DW	91	#ifdef CONFIG_COMPAT
	92	if (compat)
	93	error = compat_sock_get_timestampns(sk, argp);
	94	else
	95	#endif
	96	error = sock_get_timestampns(sk, argp);
ae40eb1e	97	goto done;
1da177e4	98	case ATM_SETSC:
8865c418 DW	99	if (net_ratelimit())
	100	printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
	101	current->comm, task_pid_nr(current));
1da177e4 LT	102	error = 0;
	103	goto done;
	104	case ATMSIGD_CTRL:
	105	if (!capable(CAP_NET_ADMIN)) {
	106	error = -EPERM;
	107	goto done;
	108	}
	109	/*
	110	* The user/kernel protocol for exchanging signalling
	111	* info uses kernel pointers as opaque references,
	112	* so the holder of the file descriptor can scribble
	113	* on the kernel... so we should make sure that we
8865c418	114	* have the same privileges that /proc/kcore needs
1da177e4 LT	115	*/
	116	if (!capable(CAP_SYS_RAWIO)) {
	117	error = -EPERM;
	118	goto done;
	119	}
8865c418 DW	120	#ifdef CONFIG_COMPAT
	121	/* WTF? I don't even want to _think_ about making this
	122	work for 32-bit userspace. TBH I don't really want
	123	to think about it at all. dwmw2. */
	124	if (compat) {
	125	if (net_ratelimit())
	126	printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
	127	error = -EINVAL;
	128	goto done;
	129	}
	130	#endif
1da177e4 LT	131	error = sigd_attach(vcc);
	132	if (!error)
	133	sock->state = SS_CONNECTED;
	134	goto done;
e2c4b721 RK	135	case ATM_SETBACKEND:
	136	case ATM_NEWBACKENDIF:
	137	{
	138	atm_backend_t backend;
	139	error = get_user(backend, (atm_backend_t __user *) argp);
	140	if (error)
	141	goto done;
	142	switch (backend) {
	143	case ATM_BACKEND_PPP:
	144	request_module("pppoatm");
	145	break;
	146	case ATM_BACKEND_BR2684:
	147	request_module("br2684");
	148	break;
	149	}
	150	}
	151	break;
	152	case ATMMPC_CTRL:
	153	case ATMMPC_DATA:
	154	request_module("mpoa");
	155	break;
	156	case ATMARPD_CTRL:
	157	request_module("clip");
	158	break;
	159	case ATMLEC_CTRL:
	160	request_module("lec");
1da177e4 LT	161	break;
	162	}
	163
1da177e4 LT	164	error = -ENOIOCTLCMD;
1da177e4 LT	165
4a3e2f71	166	mutex_lock(&ioctl_mutex);
1da177e4 LT	167	list_for_each(pos, &ioctl_list) {
	168	struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
	169	if (try_module_get(ic->owner)) {
	170	error = ic->ioctl(sock, cmd, arg);
	171	module_put(ic->owner);
	172	if (error != -ENOIOCTLCMD)
	173	break;
	174	}
	175	}
4a3e2f71	176	mutex_unlock(&ioctl_mutex);
1da177e4 LT	177
	178	if (error != -ENOIOCTLCMD)
	179	goto done;
	180
8865c418	181	error = atm_dev_ioctl(cmd, argp, compat);
1da177e4 LT	182
	183	done:
	184	return error;
	185	}
8865c418 DW	186
	187
	188	int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
	189	{
	190	return do_vcc_ioctl(sock, cmd, arg, 0);
	191	}
	192
	193	#ifdef CONFIG_COMPAT
	194	int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
	195	{
	196	return do_vcc_ioctl(sock, cmd, arg, 1);
	197	}
	198	#endif