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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 | } |