[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / atm / addr.c

/* net/atm/addr.c - Local ATM address registry */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */

#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include "signaling.h"
#include "addr.h"

static int check_addr(const struct sockaddr_atmsvc *addr)
{
	int i;

	if (addr->sas_family != AF_ATMSVC)
		return -EAFNOSUPPORT;
	if (!*addr->sas_addr.pub)
		return *addr->sas_addr.prv ? 0 : -EINVAL;
	for (i = 1; i < ATM_E164_LEN + 1; i++)	/* make sure it's \0-terminated */
		if (!addr->sas_addr.pub[i])
			return 0;
	return -EINVAL;
}

static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
{
	if (*a->sas_addr.prv)
		if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
			return 0;
	if (!*a->sas_addr.pub)
		return !*b->sas_addr.pub;
	if (!*b->sas_addr.pub)
		return 0;
	return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
}

static void notify_sigd(const struct atm_dev *dev)
{
	struct sockaddr_atmpvc pvc;

	pvc.sap_addr.itf = dev->number;
	sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
}

void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
{
	unsigned long flags;
	struct atm_dev_addr *this, *p;
	struct list_head *head;

	spin_lock_irqsave(&dev->lock, flags);
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry_safe(this, p, head, entry) {
		list_del(&this->entry);
		kfree(this);
	}
	spin_unlock_irqrestore(&dev->lock, flags);
	if (head == &dev->local)
		notify_sigd(dev);
}

int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
		 enum atm_addr_type_t atype)
{
	unsigned long flags;
	struct atm_dev_addr *this;
	struct list_head *head;
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry) {
		if (identical(&this->addr, addr)) {
			spin_unlock_irqrestore(&dev->lock, flags);
			return -EEXIST;
		}
	}
	this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
	if (!this) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOMEM;
	}
	this->addr = *addr;
	list_add(&this->entry, head);
	spin_unlock_irqrestore(&dev->lock, flags);
	if (head == &dev->local)
		notify_sigd(dev);
	return 0;
}

int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
		 enum atm_addr_type_t atype)
{
	unsigned long flags;
	struct atm_dev_addr *this;
	struct list_head *head;
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry) {
		if (identical(&this->addr, addr)) {
			list_del(&this->entry);
			spin_unlock_irqrestore(&dev->lock, flags);
			kfree(this);
			if (head == &dev->local)
				notify_sigd(dev);
			return 0;
		}
	}
	spin_unlock_irqrestore(&dev->lock, flags);
	return -ENOENT;
}

int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
		 size_t size, enum atm_addr_type_t atype)
{
	unsigned long flags;
	struct atm_dev_addr *this;
	struct list_head *head;
	int total = 0, error;
	struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;

	spin_lock_irqsave(&dev->lock, flags);
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry)
	    total += sizeof(struct sockaddr_atmsvc);
	tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
	if (!tmp_buf) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOMEM;
	}
	list_for_each_entry(this, head, entry)
	    memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
	spin_unlock_irqrestore(&dev->lock, flags);
	error = total > size ? -E2BIG : total;
	if (copy_to_user(buf, tmp_buf, total < size ? total : size))
		error = -EFAULT;
	kfree(tmp_buf);
	return error;
}
Commit	Line	Data
1da177e4 LT	1	/* net/atm/addr.c - Local ATM address registry */
	2
	3	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	4
	5	#include <linux/atm.h>
	6	#include <linux/atmdev.h>
5a0e3ad6	7	#include <linux/slab.h>
c39f01d7	8	#include <linux/uaccess.h>
1da177e4 LT	9
	10	#include "signaling.h"
	11	#include "addr.h"
	12
61c33e01	13	static int check_addr(const struct sockaddr_atmsvc *addr)
1da177e4 LT	14	{
	15	int i;
	16
	17	if (addr->sas_family != AF_ATMSVC)
	18	return -EAFNOSUPPORT;
	19	if (!*addr->sas_addr.pub)
	20	return *addr->sas_addr.prv ? 0 : -EINVAL;
	21	for (i = 1; i < ATM_E164_LEN + 1; i++) /* make sure it's \0-terminated */
	22	if (!addr->sas_addr.pub[i])
	23	return 0;
	24	return -EINVAL;
	25	}
	26
61c33e01	27	static int identical(const struct sockaddr_atmsvc a, const struct sockaddr_atmsvc b)
1da177e4 LT	28	{
	29	if (*a->sas_addr.prv)
	30	if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
	31	return 0;
	32	if (!*a->sas_addr.pub)
	33	return !*b->sas_addr.pub;
	34	if (!*b->sas_addr.pub)
	35	return 0;
	36	return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
	37	}
	38
61c33e01	39	static void notify_sigd(const struct atm_dev *dev)
1da177e4 LT	40	{
	41	struct sockaddr_atmpvc pvc;
	42
	43	pvc.sap_addr.itf = dev->number;
	44	sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
	45	}
	46
0f21ba7c	47	void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
1da177e4 LT	48	{
	49	unsigned long flags;
	50	struct atm_dev_addr this, p;
0f21ba7c	51	struct list_head *head;
1da177e4 LT	52
1da177e4 LT	53	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	54	if (atype == ATM_ADDR_LECS)
	55	head = &dev->lecs;
	56	else
	57	head = &dev->local;
	58	list_for_each_entry_safe(this, p, head, entry) {
735631a9 MW	59	list_del(&this->entry);
	60	kfree(this);
	61	}
1da177e4	62	spin_unlock_irqrestore(&dev->lock, flags);
0f21ba7c EK	63	if (head == &dev->local)
0f21ba7c EK	64	notify_sigd(dev);
1da177e4 LT	65	}
1da177e4 LT	66
61c33e01	67	int atm_add_addr(struct atm_dev dev, const struct sockaddr_atmsvc addr,
0f21ba7c	68	enum atm_addr_type_t atype)
1da177e4 LT	69	{
	70	unsigned long flags;
	71	struct atm_dev_addr *this;
0f21ba7c	72	struct list_head *head;
1da177e4 LT	73	int error;
	74
	75	error = check_addr(addr);
	76	if (error)
	77	return error;
	78	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	79	if (atype == ATM_ADDR_LECS)
	80	head = &dev->lecs;
	81	else
	82	head = &dev->local;
	83	list_for_each_entry(this, head, entry) {
1da177e4 LT	84	if (identical(&this->addr, addr)) {
	85	spin_unlock_irqrestore(&dev->lock, flags);
	86	return -EEXIST;
	87	}
	88	}
	89	this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
	90	if (!this) {
	91	spin_unlock_irqrestore(&dev->lock, flags);
	92	return -ENOMEM;
	93	}
	94	this->addr = *addr;
0f21ba7c	95	list_add(&this->entry, head);
1da177e4	96	spin_unlock_irqrestore(&dev->lock, flags);
0f21ba7c EK	97	if (head == &dev->local)
0f21ba7c EK	98	notify_sigd(dev);
1da177e4 LT	99	return 0;
	100	}
	101
61c33e01	102	int atm_del_addr(struct atm_dev dev, const struct sockaddr_atmsvc addr,
0f21ba7c	103	enum atm_addr_type_t atype)
1da177e4 LT	104	{
	105	unsigned long flags;
	106	struct atm_dev_addr *this;
0f21ba7c	107	struct list_head *head;
1da177e4 LT	108	int error;
	109
	110	error = check_addr(addr);
	111	if (error)
	112	return error;
	113	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	114	if (atype == ATM_ADDR_LECS)
	115	head = &dev->lecs;
	116	else
	117	head = &dev->local;
	118	list_for_each_entry(this, head, entry) {
1da177e4 LT	119	if (identical(&this->addr, addr)) {
	120	list_del(&this->entry);
	121	spin_unlock_irqrestore(&dev->lock, flags);
	122	kfree(this);
0f21ba7c EK	123	if (head == &dev->local)
0f21ba7c EK	124	notify_sigd(dev);
1da177e4 LT	125	return 0;
	126	}
	127	}
	128	spin_unlock_irqrestore(&dev->lock, flags);
	129	return -ENOENT;
	130	}
	131
	132	int atm_get_addr(struct atm_dev dev, struct sockaddr_atmsvc __user buf,
0f21ba7c	133	size_t size, enum atm_addr_type_t atype)
1da177e4 LT	134	{
	135	unsigned long flags;
	136	struct atm_dev_addr *this;
0f21ba7c	137	struct list_head *head;
1da177e4 LT	138	int total = 0, error;
	139	struct sockaddr_atmsvc tmp_buf, tmp_bufp;
	140
	141	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	142	if (atype == ATM_ADDR_LECS)
	143	head = &dev->lecs;
	144	else
	145	head = &dev->local;
	146	list_for_each_entry(this, head, entry)
1da177e4 LT	147	total += sizeof(struct sockaddr_atmsvc);
	148	tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
	149	if (!tmp_buf) {
	150	spin_unlock_irqrestore(&dev->lock, flags);
	151	return -ENOMEM;
	152	}
0f21ba7c	153	list_for_each_entry(this, head, entry)
1da177e4 LT	154	memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
	155	spin_unlock_irqrestore(&dev->lock, flags);
	156	error = total > size ? -E2BIG : total;
	157	if (copy_to_user(buf, tmp_buf, total < size ? total : size))
	158	error = -EFAULT;
	159	kfree(tmp_buf);
	160	return error;
	161	}