Merge tag 'pm-6.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[platform/kernel/linux-starfive.git] / crypto / crypto_user_stat.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Crypto user configuration API.
4  *
5  * Copyright (C) 2017-2018 Corentin Labbe <clabbe@baylibre.com>
6  *
7  */
8
9 #include <crypto/algapi.h>
10 #include <crypto/internal/cryptouser.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <net/netlink.h>
16 #include <net/sock.h>
17
18 #define null_terminated(x)      (strnlen(x, sizeof(x)) < sizeof(x))
19
20 struct crypto_dump_info {
21         struct sk_buff *in_skb;
22         struct sk_buff *out_skb;
23         u32 nlmsg_seq;
24         u16 nlmsg_flags;
25 };
26
27 static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
28 {
29         struct crypto_stat_cipher rcipher;
30
31         memset(&rcipher, 0, sizeof(rcipher));
32
33         strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
34
35         return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
36 }
37
38 static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
39 {
40         struct crypto_stat_compress rcomp;
41
42         memset(&rcomp, 0, sizeof(rcomp));
43
44         strscpy(rcomp.type, "compression", sizeof(rcomp.type));
45
46         return nla_put(skb, CRYPTOCFGA_STAT_COMPRESS, sizeof(rcomp), &rcomp);
47 }
48
49 static int crypto_reportstat_one(struct crypto_alg *alg,
50                                  struct crypto_user_alg *ualg,
51                                  struct sk_buff *skb)
52 {
53         memset(ualg, 0, sizeof(*ualg));
54
55         strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
56         strscpy(ualg->cru_driver_name, alg->cra_driver_name,
57                 sizeof(ualg->cru_driver_name));
58         strscpy(ualg->cru_module_name, module_name(alg->cra_module),
59                 sizeof(ualg->cru_module_name));
60
61         ualg->cru_type = 0;
62         ualg->cru_mask = 0;
63         ualg->cru_flags = alg->cra_flags;
64         ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
65
66         if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
67                 goto nla_put_failure;
68         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
69                 struct crypto_stat_larval rl;
70
71                 memset(&rl, 0, sizeof(rl));
72                 strscpy(rl.type, "larval", sizeof(rl.type));
73                 if (nla_put(skb, CRYPTOCFGA_STAT_LARVAL, sizeof(rl), &rl))
74                         goto nla_put_failure;
75                 goto out;
76         }
77
78         if (alg->cra_type && alg->cra_type->report_stat) {
79                 if (alg->cra_type->report_stat(skb, alg))
80                         goto nla_put_failure;
81                 goto out;
82         }
83
84         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
85         case CRYPTO_ALG_TYPE_CIPHER:
86                 if (crypto_report_cipher(skb, alg))
87                         goto nla_put_failure;
88                 break;
89         case CRYPTO_ALG_TYPE_COMPRESS:
90                 if (crypto_report_comp(skb, alg))
91                         goto nla_put_failure;
92                 break;
93         default:
94                 pr_err("ERROR: Unhandled alg %d in %s\n",
95                        alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL),
96                        __func__);
97         }
98
99 out:
100         return 0;
101
102 nla_put_failure:
103         return -EMSGSIZE;
104 }
105
106 static int crypto_reportstat_alg(struct crypto_alg *alg,
107                                  struct crypto_dump_info *info)
108 {
109         struct sk_buff *in_skb = info->in_skb;
110         struct sk_buff *skb = info->out_skb;
111         struct nlmsghdr *nlh;
112         struct crypto_user_alg *ualg;
113         int err = 0;
114
115         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
116                         CRYPTO_MSG_GETSTAT, sizeof(*ualg), info->nlmsg_flags);
117         if (!nlh) {
118                 err = -EMSGSIZE;
119                 goto out;
120         }
121
122         ualg = nlmsg_data(nlh);
123
124         err = crypto_reportstat_one(alg, ualg, skb);
125         if (err) {
126                 nlmsg_cancel(skb, nlh);
127                 goto out;
128         }
129
130         nlmsg_end(skb, nlh);
131
132 out:
133         return err;
134 }
135
136 int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
137                       struct nlattr **attrs)
138 {
139         struct net *net = sock_net(in_skb->sk);
140         struct crypto_user_alg *p = nlmsg_data(in_nlh);
141         struct crypto_alg *alg;
142         struct sk_buff *skb;
143         struct crypto_dump_info info;
144         int err;
145
146         if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
147                 return -EINVAL;
148
149         alg = crypto_alg_match(p, 0);
150         if (!alg)
151                 return -ENOENT;
152
153         err = -ENOMEM;
154         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
155         if (!skb)
156                 goto drop_alg;
157
158         info.in_skb = in_skb;
159         info.out_skb = skb;
160         info.nlmsg_seq = in_nlh->nlmsg_seq;
161         info.nlmsg_flags = 0;
162
163         err = crypto_reportstat_alg(alg, &info);
164
165 drop_alg:
166         crypto_mod_put(alg);
167
168         if (err) {
169                 kfree_skb(skb);
170                 return err;
171         }
172
173         return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
174 }
175
176 MODULE_LICENSE("GPL");