[mirror_ubuntu-bionic-kernel.git] / net / atm / addr.c

// SPDX-License-Identifier: GPL-2.0
/* 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/* net/atm/addr.c - Local ATM address registry */
	3
	4	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	5
	6	#include <linux/atm.h>
	7	#include <linux/atmdev.h>
5a0e3ad6	8	#include <linux/slab.h>
c39f01d7	9	#include <linux/uaccess.h>
1da177e4 LT	10
	11	#include "signaling.h"
	12	#include "addr.h"
	13
61c33e01	14	static int check_addr(const struct sockaddr_atmsvc *addr)
1da177e4 LT	15	{
	16	int i;
	17
	18	if (addr->sas_family != AF_ATMSVC)
	19	return -EAFNOSUPPORT;
	20	if (!*addr->sas_addr.pub)
	21	return *addr->sas_addr.prv ? 0 : -EINVAL;
	22	for (i = 1; i < ATM_E164_LEN + 1; i++) /* make sure it's \0-terminated */
	23	if (!addr->sas_addr.pub[i])
	24	return 0;
	25	return -EINVAL;
	26	}
	27
61c33e01	28	static int identical(const struct sockaddr_atmsvc a, const struct sockaddr_atmsvc b)
1da177e4 LT	29	{
	30	if (*a->sas_addr.prv)
	31	if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
	32	return 0;
	33	if (!*a->sas_addr.pub)
	34	return !*b->sas_addr.pub;
	35	if (!*b->sas_addr.pub)
	36	return 0;
	37	return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
	38	}
	39
61c33e01	40	static void notify_sigd(const struct atm_dev *dev)
1da177e4 LT	41	{
	42	struct sockaddr_atmpvc pvc;
	43
	44	pvc.sap_addr.itf = dev->number;
	45	sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
	46	}
	47
0f21ba7c	48	void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
1da177e4 LT	49	{
	50	unsigned long flags;
	51	struct atm_dev_addr this, p;
0f21ba7c	52	struct list_head *head;
1da177e4 LT	53
1da177e4 LT	54	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	55	if (atype == ATM_ADDR_LECS)
	56	head = &dev->lecs;
	57	else
	58	head = &dev->local;
	59	list_for_each_entry_safe(this, p, head, entry) {
735631a9 MW	60	list_del(&this->entry);
	61	kfree(this);
	62	}
1da177e4	63	spin_unlock_irqrestore(&dev->lock, flags);
0f21ba7c EK	64	if (head == &dev->local)
0f21ba7c EK	65	notify_sigd(dev);
1da177e4 LT	66	}
1da177e4 LT	67
61c33e01	68	int atm_add_addr(struct atm_dev dev, const struct sockaddr_atmsvc addr,
0f21ba7c	69	enum atm_addr_type_t atype)
1da177e4 LT	70	{
	71	unsigned long flags;
	72	struct atm_dev_addr *this;
0f21ba7c	73	struct list_head *head;
1da177e4 LT	74	int error;
	75
	76	error = check_addr(addr);
	77	if (error)
	78	return error;
	79	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	80	if (atype == ATM_ADDR_LECS)
	81	head = &dev->lecs;
	82	else
	83	head = &dev->local;
	84	list_for_each_entry(this, head, entry) {
1da177e4 LT	85	if (identical(&this->addr, addr)) {
	86	spin_unlock_irqrestore(&dev->lock, flags);
	87	return -EEXIST;
	88	}
	89	}
	90	this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
	91	if (!this) {
	92	spin_unlock_irqrestore(&dev->lock, flags);
	93	return -ENOMEM;
	94	}
	95	this->addr = *addr;
0f21ba7c	96	list_add(&this->entry, head);
1da177e4	97	spin_unlock_irqrestore(&dev->lock, flags);
0f21ba7c EK	98	if (head == &dev->local)
0f21ba7c EK	99	notify_sigd(dev);
1da177e4 LT	100	return 0;
	101	}
	102
61c33e01	103	int atm_del_addr(struct atm_dev dev, const struct sockaddr_atmsvc addr,
0f21ba7c	104	enum atm_addr_type_t atype)
1da177e4 LT	105	{
	106	unsigned long flags;
	107	struct atm_dev_addr *this;
0f21ba7c	108	struct list_head *head;
1da177e4 LT	109	int error;
	110
	111	error = check_addr(addr);
	112	if (error)
	113	return error;
	114	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	115	if (atype == ATM_ADDR_LECS)
	116	head = &dev->lecs;
	117	else
	118	head = &dev->local;
	119	list_for_each_entry(this, head, entry) {
1da177e4 LT	120	if (identical(&this->addr, addr)) {
	121	list_del(&this->entry);
	122	spin_unlock_irqrestore(&dev->lock, flags);
	123	kfree(this);
0f21ba7c EK	124	if (head == &dev->local)
0f21ba7c EK	125	notify_sigd(dev);
1da177e4 LT	126	return 0;
	127	}
	128	}
	129	spin_unlock_irqrestore(&dev->lock, flags);
	130	return -ENOENT;
	131	}
	132
	133	int atm_get_addr(struct atm_dev dev, struct sockaddr_atmsvc __user buf,
0f21ba7c	134	size_t size, enum atm_addr_type_t atype)
1da177e4 LT	135	{
	136	unsigned long flags;
	137	struct atm_dev_addr *this;
0f21ba7c	138	struct list_head *head;
1da177e4 LT	139	int total = 0, error;
	140	struct sockaddr_atmsvc tmp_buf, tmp_bufp;
	141
	142	spin_lock_irqsave(&dev->lock, flags);
0f21ba7c EK	143	if (atype == ATM_ADDR_LECS)
	144	head = &dev->lecs;
	145	else
	146	head = &dev->local;
	147	list_for_each_entry(this, head, entry)
1da177e4 LT	148	total += sizeof(struct sockaddr_atmsvc);
	149	tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
	150	if (!tmp_buf) {
	151	spin_unlock_irqrestore(&dev->lock, flags);
	152	return -ENOMEM;
	153	}
0f21ba7c	154	list_for_each_entry(this, head, entry)
1da177e4 LT	155	memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
	156	spin_unlock_irqrestore(&dev->lock, flags);
	157	error = total > size ? -E2BIG : total;
	158	if (copy_to_user(buf, tmp_buf, total < size ? total : size))
	159	error = -EFAULT;
	160	kfree(tmp_buf);
	161	return error;
	162	}