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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/* 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Joe Perchesc39f01d2010-01-26 11:40:01 +00009#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#include "signaling.h"
12#include "addr.h"
13
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070014static int check_addr(const struct sockaddr_atmsvc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070015{
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
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070028static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
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
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070040static void notify_sigd(const struct atm_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
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
Eric Kinzie0f21ba72005-10-06 22:19:28 -070048void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 unsigned long flags;
51 struct atm_dev_addr *this, *p;
Eric Kinzie0f21ba72005-10-06 22:19:28 -070052 struct list_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 spin_lock_irqsave(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -070055 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) {
Martin Whitaker735631a2005-09-28 16:35:22 -070060 list_del(&this->entry);
61 kfree(this);
62 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 spin_unlock_irqrestore(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -070064 if (head == &dev->local)
65 notify_sigd(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
67
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070068int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
Eric Kinzie0f21ba72005-10-06 22:19:28 -070069 enum atm_addr_type_t atype)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 unsigned long flags;
72 struct atm_dev_addr *this;
Eric Kinzie0f21ba72005-10-06 22:19:28 -070073 struct list_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 int error;
75
76 error = check_addr(addr);
77 if (error)
78 return error;
79 spin_lock_irqsave(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -070080 if (atype == ATM_ADDR_LECS)
81 head = &dev->lecs;
82 else
83 head = &dev->local;
84 list_for_each_entry(this, head, entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 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;
Eric Kinzie0f21ba72005-10-06 22:19:28 -070096 list_add(&this->entry, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 spin_unlock_irqrestore(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -070098 if (head == &dev->local)
99 notify_sigd(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return 0;
101}
102
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -0700103int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700104 enum atm_addr_type_t atype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 unsigned long flags;
107 struct atm_dev_addr *this;
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700108 struct list_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 int error;
110
111 error = check_addr(addr);
112 if (error)
113 return error;
114 spin_lock_irqsave(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700115 if (atype == ATM_ADDR_LECS)
116 head = &dev->lecs;
117 else
118 head = &dev->local;
119 list_for_each_entry(this, head, entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (identical(&this->addr, addr)) {
121 list_del(&this->entry);
122 spin_unlock_irqrestore(&dev->lock, flags);
123 kfree(this);
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700124 if (head == &dev->local)
125 notify_sigd(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 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,
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700134 size_t size, enum atm_addr_type_t atype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 unsigned long flags;
137 struct atm_dev_addr *this;
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700138 struct list_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 int total = 0, error;
140 struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
141
142 spin_lock_irqsave(&dev->lock, flags);
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700143 if (atype == ATM_ADDR_LECS)
144 head = &dev->lecs;
145 else
146 head = &dev->local;
147 list_for_each_entry(this, head, entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 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 }
Eric Kinzie0f21ba72005-10-06 22:19:28 -0700154 list_for_each_entry(this, head, entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 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}