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}
162