addr.c 3.85 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6
/* 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>
7
#include <linux/slab.h>
8
#include <linux/uaccess.h>
Linus Torvalds's avatar
Linus Torvalds committed
9 10 11 12

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

13
static int check_addr(const struct sockaddr_atmsvc *addr)
Linus Torvalds's avatar
Linus Torvalds committed
14 15 16 17 18 19 20 21 22 23 24 25 26
{
	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;
}

27
static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
Linus Torvalds's avatar
Linus Torvalds committed
28 29 30 31 32 33 34 35 36 37 38
{
	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);
}

39
static void notify_sigd(const struct atm_dev *dev)
Linus Torvalds's avatar
Linus Torvalds committed
40 41 42 43 44 45 46
{
	struct sockaddr_atmpvc pvc;

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

47
void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
Linus Torvalds's avatar
Linus Torvalds committed
48 49 50
{
	unsigned long flags;
	struct atm_dev_addr *this, *p;
51
	struct list_head *head;
Linus Torvalds's avatar
Linus Torvalds committed
52 53

	spin_lock_irqsave(&dev->lock, flags);
54 55 56 57 58
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry_safe(this, p, head, entry) {
59 60 61
		list_del(&this->entry);
		kfree(this);
	}
Linus Torvalds's avatar
Linus Torvalds committed
62
	spin_unlock_irqrestore(&dev->lock, flags);
63 64
	if (head == &dev->local)
		notify_sigd(dev);
Linus Torvalds's avatar
Linus Torvalds committed
65 66
}

67
int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
68
		 enum atm_addr_type_t atype)
Linus Torvalds's avatar
Linus Torvalds committed
69 70 71
{
	unsigned long flags;
	struct atm_dev_addr *this;
72
	struct list_head *head;
Linus Torvalds's avatar
Linus Torvalds committed
73 74 75 76 77 78
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
79 80 81 82 83
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry) {
Linus Torvalds's avatar
Linus Torvalds committed
84 85 86 87 88 89 90 91 92 93 94
		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;
95
	list_add(&this->entry, head);
Linus Torvalds's avatar
Linus Torvalds committed
96
	spin_unlock_irqrestore(&dev->lock, flags);
97 98
	if (head == &dev->local)
		notify_sigd(dev);
Linus Torvalds's avatar
Linus Torvalds committed
99 100 101
	return 0;
}

102
int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
103
		 enum atm_addr_type_t atype)
Linus Torvalds's avatar
Linus Torvalds committed
104 105 106
{
	unsigned long flags;
	struct atm_dev_addr *this;
107
	struct list_head *head;
Linus Torvalds's avatar
Linus Torvalds committed
108 109 110 111 112 113
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
114 115 116 117 118
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry) {
Linus Torvalds's avatar
Linus Torvalds committed
119 120 121 122
		if (identical(&this->addr, addr)) {
			list_del(&this->entry);
			spin_unlock_irqrestore(&dev->lock, flags);
			kfree(this);
123 124
			if (head == &dev->local)
				notify_sigd(dev);
Linus Torvalds's avatar
Linus Torvalds committed
125 126 127 128 129 130 131 132
			return 0;
		}
	}
	spin_unlock_irqrestore(&dev->lock, flags);
	return -ENOENT;
}

int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
133
		 size_t size, enum atm_addr_type_t atype)
Linus Torvalds's avatar
Linus Torvalds committed
134 135 136
{
	unsigned long flags;
	struct atm_dev_addr *this;
137
	struct list_head *head;
Linus Torvalds's avatar
Linus Torvalds committed
138 139 140 141
	int total = 0, error;
	struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;

	spin_lock_irqsave(&dev->lock, flags);
142 143 144 145 146
	if (atype == ATM_ADDR_LECS)
		head = &dev->lecs;
	else
		head = &dev->local;
	list_for_each_entry(this, head, entry)
Linus Torvalds's avatar
Linus Torvalds committed
147 148 149 150 151 152
	    total += sizeof(struct sockaddr_atmsvc);
	tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
	if (!tmp_buf) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOMEM;
	}
153
	list_for_each_entry(this, head, entry)
Linus Torvalds's avatar
Linus Torvalds committed
154 155 156 157 158 159 160 161
	    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;
}