1// SPDX-License-Identifier: GPL-2.0
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>
8#include <linux/slab.h>
9#include <linux/uaccess.h>
10
11#include "signaling.h"
12#include "addr.h"
13
14static int check_addr(const struct sockaddr_atmsvc *addr)
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
28static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
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
40static void notify_sigd(const struct atm_dev *dev)
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
48void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
49{
50	unsigned long flags;
51	struct atm_dev_addr *this, *p;
52	struct list_head *head;
53
54	spin_lock_irqsave(&dev->lock, flags);
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) {
60		list_del(&this->entry);
61		kfree(this);
62	}
63	spin_unlock_irqrestore(&dev->lock, flags);
64	if (head == &dev->local)
65		notify_sigd(dev);
66}
67
68int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
69		 enum atm_addr_type_t atype)
70{
71	unsigned long flags;
72	struct atm_dev_addr *this;
73	struct list_head *head;
74	int error;
75
76	error = check_addr(addr);
77	if (error)
78		return error;
79	spin_lock_irqsave(&dev->lock, flags);
80	if (atype == ATM_ADDR_LECS)
81		head = &dev->lecs;
82	else
83		head = &dev->local;
84	list_for_each_entry(this, head, entry) {
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;
96	list_add(&this->entry, head);
97	spin_unlock_irqrestore(&dev->lock, flags);
98	if (head == &dev->local)
99		notify_sigd(dev);
100	return 0;
101}
102
103int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
104		 enum atm_addr_type_t atype)
105{
106	unsigned long flags;
107	struct atm_dev_addr *this;
108	struct list_head *head;
109	int error;
110
111	error = check_addr(addr);
112	if (error)
113		return error;
114	spin_lock_irqsave(&dev->lock, flags);
115	if (atype == ATM_ADDR_LECS)
116		head = &dev->lecs;
117	else
118		head = &dev->local;
119	list_for_each_entry(this, head, entry) {
120		if (identical(&this->addr, addr)) {
121			list_del(&this->entry);
122			spin_unlock_irqrestore(&dev->lock, flags);
123			kfree(this);
124			if (head == &dev->local)
125				notify_sigd(dev);
126			return 0;
127		}
128	}
129	spin_unlock_irqrestore(&dev->lock, flags);
130	return -ENOENT;
131}
132
133int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
134		 size_t size, enum atm_addr_type_t atype)
135{
136	unsigned long flags;
137	struct atm_dev_addr *this;
138	struct list_head *head;
139	int total = 0, error;
140	struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
141
142	spin_lock_irqsave(&dev->lock, flags);
143	if (atype == ATM_ADDR_LECS)
144		head = &dev->lecs;
145	else
146		head = &dev->local;
147	list_for_each_entry(this, head, entry)
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	}
154	list_for_each_entry(this, head, entry)
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}
163