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
 20struct 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
 27static 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
 38static 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
 49static 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
 99out:
100	return 0;
101
102nla_put_failure:
103	return -EMSGSIZE;
104}
105
106static 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
132out:
133	return err;
134}
135
136int 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
165drop_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
176MODULE_LICENSE("GPL");