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(p: a->sas_addr.prv, q: 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, type: as_itf_notify, NULL, pvc: &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(entry: &this->entry); |
61 | kfree(objp: this); |
62 | } |
63 | spin_unlock_irqrestore(lock: &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(a: &this->addr, b: addr)) { |
86 | spin_unlock_irqrestore(lock: &dev->lock, flags); |
87 | return -EEXIST; |
88 | } |
89 | } |
90 | this = kmalloc(size: sizeof(struct atm_dev_addr), GFP_ATOMIC); |
91 | if (!this) { |
92 | spin_unlock_irqrestore(lock: &dev->lock, flags); |
93 | return -ENOMEM; |
94 | } |
95 | this->addr = *addr; |
96 | list_add(new: &this->entry, head); |
97 | spin_unlock_irqrestore(lock: &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(a: &this->addr, b: addr)) { |
121 | list_del(entry: &this->entry); |
122 | spin_unlock_irqrestore(lock: &dev->lock, flags); |
123 | kfree(objp: this); |
124 | if (head == &dev->local) |
125 | notify_sigd(dev); |
126 | return 0; |
127 | } |
128 | } |
129 | spin_unlock_irqrestore(lock: &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(size: total, GFP_ATOMIC); |
150 | if (!tmp_buf) { |
151 | spin_unlock_irqrestore(lock: &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(lock: &dev->lock, flags); |
157 | error = total > size ? -E2BIG : total; |
158 | if (copy_to_user(to: buf, from: tmp_buf, n: total < size ? total : size)) |
159 | error = -EFAULT; |
160 | kfree(objp: tmp_buf); |
161 | return error; |
162 | } |
163 | |