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13#include <linux/crypto.h>
14#include <linux/ctype.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/kthread.h>
18#include <linux/module.h>
19#include <linux/notifier.h>
20#include <linux/rtnetlink.h>
21#include <linux/sched.h>
22#include <linux/string.h>
23
24#include "internal.h"
25
26struct cryptomgr_param {
27 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
28
29 struct {
30 struct rtattr attr;
31 struct crypto_attr_type data;
32 } type;
33
34 union {
35 struct rtattr attr;
36 struct {
37 struct rtattr attr;
38 struct crypto_attr_alg data;
39 } alg;
40 struct {
41 struct rtattr attr;
42 struct crypto_attr_u32 data;
43 } nu32;
44 } attrs[CRYPTO_MAX_ATTRS];
45
46 char larval[CRYPTO_MAX_ALG_NAME];
47 char template[CRYPTO_MAX_ALG_NAME];
48};
49
50static int cryptomgr_probe(void *data)
51{
52 struct cryptomgr_param *param = data;
53 struct crypto_template *tmpl;
54 struct crypto_instance *inst;
55 int err;
56
57 tmpl = crypto_lookup_template(param->template);
58 if (!tmpl)
59 goto err;
60
61 do {
62 inst = tmpl->alloc(param->tb);
63 if (IS_ERR(inst))
64 err = PTR_ERR(inst);
65 else if ((err = crypto_register_instance(tmpl, inst)))
66 tmpl->free(inst);
67 } while (err == -EAGAIN && !signal_pending(current));
68
69 crypto_tmpl_put(tmpl);
70
71 if (err)
72 goto err;
73
74out:
75 kfree(param);
76 module_put_and_exit(0);
77
78err:
79 crypto_larval_error(param->larval, param->type.data.type,
80 param->type.data.mask);
81 goto out;
82}
83
84static int cryptomgr_schedule_probe(struct crypto_larval *larval)
85{
86 struct task_struct *thread;
87 struct cryptomgr_param *param;
88 const char *name = larval->alg.cra_name;
89 const char *p;
90 unsigned int len;
91 int i;
92
93 if (!try_module_get(THIS_MODULE))
94 goto err;
95
96 param = kzalloc(sizeof(*param), GFP_KERNEL);
97 if (!param)
98 goto err_put_module;
99
100 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
101 ;
102
103 len = p - name;
104 if (!len || *p != '(')
105 goto err_free_param;
106
107 memcpy(param->template, name, len);
108
109 i = 0;
110 for (;;) {
111 int notnum = 0;
112
113 name = ++p;
114 len = 0;
115
116 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
117 notnum |= !isdigit(*p);
118
119 if (*p == '(') {
120 int recursion = 0;
121
122 for (;;) {
123 if (!*++p)
124 goto err_free_param;
125 if (*p == '(')
126 recursion++;
127 else if (*p == ')' && !recursion--)
128 break;
129 }
130
131 notnum = 1;
132 p++;
133 }
134
135 len = p - name;
136 if (!len)
137 goto err_free_param;
138
139 if (notnum) {
140 param->attrs[i].alg.attr.rta_len =
141 sizeof(param->attrs[i].alg);
142 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
143 memcpy(param->attrs[i].alg.data.name, name, len);
144 } else {
145 param->attrs[i].nu32.attr.rta_len =
146 sizeof(param->attrs[i].nu32);
147 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
148 param->attrs[i].nu32.data.num =
149 simple_strtol(name, NULL, 0);
150 }
151
152 param->tb[i + 1] = ¶m->attrs[i].attr;
153 i++;
154
155 if (i >= CRYPTO_MAX_ATTRS)
156 goto err_free_param;
157
158 if (*p == ')')
159 break;
160
161 if (*p != ',')
162 goto err_free_param;
163 }
164
165 if (!i)
166 goto err_free_param;
167
168 param->tb[i + 1] = NULL;
169
170 param->type.attr.rta_len = sizeof(param->type);
171 param->type.attr.rta_type = CRYPTOA_TYPE;
172 param->type.data.type = larval->alg.cra_flags;
173 param->type.data.mask = larval->mask;
174 param->tb[0] = ¶m->type.attr;
175
176 memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
177
178 thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
179 if (IS_ERR(thread))
180 goto err_free_param;
181
182 return NOTIFY_STOP;
183
184err_free_param:
185 kfree(param);
186err_put_module:
187 module_put(THIS_MODULE);
188err:
189 return NOTIFY_OK;
190}
191
192static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
193 void *data)
194{
195 switch (msg) {
196 case CRYPTO_MSG_ALG_REQUEST:
197 return cryptomgr_schedule_probe(data);
198 }
199
200 return NOTIFY_DONE;
201}
202
203static struct notifier_block cryptomgr_notifier = {
204 .notifier_call = cryptomgr_notify,
205};
206
207static int __init cryptomgr_init(void)
208{
209 return crypto_register_notifier(&cryptomgr_notifier);
210}
211
212static void __exit cryptomgr_exit(void)
213{
214 int err = crypto_unregister_notifier(&cryptomgr_notifier);
215 BUG_ON(err);
216}
217
218module_init(cryptomgr_init);
219module_exit(cryptomgr_exit);
220
221MODULE_LICENSE("GPL");
222MODULE_DESCRIPTION("Crypto Algorithm Manager");
223
