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>
  7#include <linux/slab.h>
  8#include <linux/uaccess.h>
  9
 10#include "signaling.h"
 11#include "addr.h"
 12
 13static int check_addr(const struct sockaddr_atmsvc *addr)
 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
 27static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
 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
 39static void notify_sigd(const struct atm_dev *dev)
 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
 47void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
 48{
 49	unsigned long flags;
 50	struct atm_dev_addr *this, *p;
 51	struct list_head *head;
 52
 53	spin_lock_irqsave(&dev->lock, flags);
 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) {
 59		list_del(&this->entry);
 60		kfree(this);
 61	}
 62	spin_unlock_irqrestore(&dev->lock, flags);
 63	if (head == &dev->local)
 64		notify_sigd(dev);
 65}
 66
 67int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
 68		 enum atm_addr_type_t atype)
 69{
 70	unsigned long flags;
 71	struct atm_dev_addr *this;
 72	struct list_head *head;
 73	int error;
 74
 75	error = check_addr(addr);
 76	if (error)
 77		return error;
 78	spin_lock_irqsave(&dev->lock, flags);
 79	if (atype == ATM_ADDR_LECS)
 80		head = &dev->lecs;
 81	else
 82		head = &dev->local;
 83	list_for_each_entry(this, head, entry) {
 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;
 95	list_add(&this->entry, head);
 96	spin_unlock_irqrestore(&dev->lock, flags);
 97	if (head == &dev->local)
 98		notify_sigd(dev);
 99	return 0;
100}
101
102int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
103		 enum atm_addr_type_t atype)
104{
105	unsigned long flags;
106	struct atm_dev_addr *this;
107	struct list_head *head;
108	int error;
109
110	error = check_addr(addr);
111	if (error)
112		return error;
113	spin_lock_irqsave(&dev->lock, flags);
114	if (atype == ATM_ADDR_LECS)
115		head = &dev->lecs;
116	else
117		head = &dev->local;
118	list_for_each_entry(this, head, entry) {
119		if (identical(&this->addr, addr)) {
120			list_del(&this->entry);
121			spin_unlock_irqrestore(&dev->lock, flags);
122			kfree(this);
123			if (head == &dev->local)
124				notify_sigd(dev);
125			return 0;
126		}
127	}
128	spin_unlock_irqrestore(&dev->lock, flags);
129	return -ENOENT;
130}
131
132int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
133		 size_t size, enum atm_addr_type_t atype)
134{
135	unsigned long flags;
136	struct atm_dev_addr *this;
137	struct list_head *head;
138	int total = 0, error;
139	struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
140
141	spin_lock_irqsave(&dev->lock, flags);
142	if (atype == ATM_ADDR_LECS)
143		head = &dev->lecs;
144	else
145		head = &dev->local;
146	list_for_each_entry(this, head, entry)
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	}
153	list_for_each_entry(this, head, entry)
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}