[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/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/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			printk(KERN_WARNING "ATM_SETSC is obsolete\n");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 */
	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 */
295098e9	24	#include "common.h"
1da177e4 LT	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;
e2c4b721 RK	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");
1da177e4 LT	134	break;
	135	}
	136
1da177e4 LT	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	}