[net-next-2.6.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/config.h>
#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 <asm/ioctls.h>

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


static DECLARE_MUTEX(ioctl_mutex);
static LIST_HEAD(ioctl_list);


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

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

EXPORT_SYMBOL(register_atm_ioctl);
EXPORT_SYMBOL(deregister_atm_ioctl);

int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	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 -
					 atomic_read(&sk->sk_wmem_alloc),
					 (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 */
			error = sock_get_timestamp(sk, argp);
			goto done;
		case ATM_SETSC:
			printk(KERN_WARNING "ATM_SETSC is obsolete\n");
			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 privledges that /proc/kcore needs
			 */
			if (!capable(CAP_SYS_RAWIO)) {
				error = -EPERM;
				goto done;
			}
			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;

	down(&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;
		}
	}
	up(&ioctl_mutex);

	if (error != -ENOIOCTLCMD)
		goto done;

	error = atm_dev_ioctl(cmd, argp);

done:
	return error;
}
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
	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 */
4fc268d2	15	#include <linux/capability.h>
1da177e4 LT	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 */
295098e9	25	#include "common.h"
1da177e4 LT	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;
e2c4b721 RK	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");
1da177e4 LT	135	break;
	136	}
	137
1da177e4 LT	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	}