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
14 static 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
28 static 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
40 static 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
48 void 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
68 int 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
103 int 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
133 int 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
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