1 /* net/atm/addr.c - Local ATM address registry */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5 #include <linux/atm.h>
6 #include <linux/atmdev.h>
7 #include <linux/slab.h>
8 #include <linux/uaccess.h>
9
10 #include "signaling.h"
11 #include "addr.h"
12
check_addr(const struct sockaddr_atmsvc * addr)13 static int check_addr(const struct sockaddr_atmsvc *addr)
14 {
15 int i;
16
17 if (addr->sas_family != AF_ATMSVC)
18 return -EAFNOSUPPORT;
19 if (!*addr->sas_addr.pub)
20 return *addr->sas_addr.prv ? 0 : -EINVAL;
21 for (i = 1; i < ATM_E164_LEN + 1; i++) /* make sure it's \0-terminated */
22 if (!addr->sas_addr.pub[i])
23 return 0;
24 return -EINVAL;
25 }
26
identical(const struct sockaddr_atmsvc * a,const struct sockaddr_atmsvc * b)27 static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
28 {
29 if (*a->sas_addr.prv)
30 if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
31 return 0;
32 if (!*a->sas_addr.pub)
33 return !*b->sas_addr.pub;
34 if (!*b->sas_addr.pub)
35 return 0;
36 return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
37 }
38
notify_sigd(const struct atm_dev * dev)39 static void notify_sigd(const struct atm_dev *dev)
40 {
41 struct sockaddr_atmpvc pvc;
42
43 pvc.sap_addr.itf = dev->number;
44 sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
45 }
46
atm_reset_addr(struct atm_dev * dev,enum atm_addr_type_t atype)47 void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
48 {
49 unsigned long flags;
50 struct atm_dev_addr *this, *p;
51 struct list_head *head;
52
53 spin_lock_irqsave(&dev->lock, flags);
54 if (atype == ATM_ADDR_LECS)
55 head = &dev->lecs;
56 else
57 head = &dev->local;
58 list_for_each_entry_safe(this, p, head, entry) {
59 list_del(&this->entry);
60 kfree(this);
61 }
62 spin_unlock_irqrestore(&dev->lock, flags);
63 if (head == &dev->local)
64 notify_sigd(dev);
65 }
66
atm_add_addr(struct atm_dev * dev,const struct sockaddr_atmsvc * addr,enum atm_addr_type_t atype)67 int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
68 enum atm_addr_type_t atype)
69 {
70 unsigned long flags;
71 struct atm_dev_addr *this;
72 struct list_head *head;
73 int error;
74
75 error = check_addr(addr);
76 if (error)
77 return error;
78 spin_lock_irqsave(&dev->lock, flags);
79 if (atype == ATM_ADDR_LECS)
80 head = &dev->lecs;
81 else
82 head = &dev->local;
83 list_for_each_entry(this, head, entry) {
84 if (identical(&this->addr, addr)) {
85 spin_unlock_irqrestore(&dev->lock, flags);
86 return -EEXIST;
87 }
88 }
89 this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
90 if (!this) {
91 spin_unlock_irqrestore(&dev->lock, flags);
92 return -ENOMEM;
93 }
94 this->addr = *addr;
95 list_add(&this->entry, head);
96 spin_unlock_irqrestore(&dev->lock, flags);
97 if (head == &dev->local)
98 notify_sigd(dev);
99 return 0;
100 }
101
atm_del_addr(struct atm_dev * dev,const struct sockaddr_atmsvc * addr,enum atm_addr_type_t atype)102 int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
103 enum atm_addr_type_t atype)
104 {
105 unsigned long flags;
106 struct atm_dev_addr *this;
107 struct list_head *head;
108 int error;
109
110 error = check_addr(addr);
111 if (error)
112 return error;
113 spin_lock_irqsave(&dev->lock, flags);
114 if (atype == ATM_ADDR_LECS)
115 head = &dev->lecs;
116 else
117 head = &dev->local;
118 list_for_each_entry(this, head, entry) {
119 if (identical(&this->addr, addr)) {
120 list_del(&this->entry);
121 spin_unlock_irqrestore(&dev->lock, flags);
122 kfree(this);
123 if (head == &dev->local)
124 notify_sigd(dev);
125 return 0;
126 }
127 }
128 spin_unlock_irqrestore(&dev->lock, flags);
129 return -ENOENT;
130 }
131
atm_get_addr(struct atm_dev * dev,struct sockaddr_atmsvc __user * buf,size_t size,enum atm_addr_type_t atype)132 int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
133 size_t size, enum atm_addr_type_t atype)
134 {
135 unsigned long flags;
136 struct atm_dev_addr *this;
137 struct list_head *head;
138 int total = 0, error;
139 struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
140
141 spin_lock_irqsave(&dev->lock, flags);
142 if (atype == ATM_ADDR_LECS)
143 head = &dev->lecs;
144 else
145 head = &dev->local;
146 list_for_each_entry(this, head, entry)
147 total += sizeof(struct sockaddr_atmsvc);
148 tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
149 if (!tmp_buf) {
150 spin_unlock_irqrestore(&dev->lock, flags);
151 return -ENOMEM;
152 }
153 list_for_each_entry(this, head, entry)
154 memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
155 spin_unlock_irqrestore(&dev->lock, flags);
156 error = total > size ? -E2BIG : total;
157 if (copy_to_user(buf, tmp_buf, total < size ? total : size))
158 error = -EFAULT;
159 kfree(tmp_buf);
160 return error;
161 }
162