diff options
Diffstat (limited to 'crypto/crypto_user_stat.c')
| -rw-r--r-- | crypto/crypto_user_stat.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/crypto/crypto_user_stat.c b/crypto/crypto_user_stat.c new file mode 100644 index 0000000000..d4f3d39b51 --- /dev/null +++ b/crypto/crypto_user_stat.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Crypto user configuration API. + * + * Copyright (C) 2017-2018 Corentin Labbe <clabbe@baylibre.com> + * + */ + +#include <crypto/algapi.h> +#include <crypto/internal/cryptouser.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <net/netlink.h> +#include <net/sock.h> + +#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) + +struct crypto_dump_info { + struct sk_buff *in_skb; + struct sk_buff *out_skb; + u32 nlmsg_seq; + u16 nlmsg_flags; +}; + +static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) +{ + struct crypto_stat_cipher rcipher; + + memset(&rcipher, 0, sizeof(rcipher)); + + strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); + + return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher); +} + +static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) +{ + struct crypto_stat_compress rcomp; + + memset(&rcomp, 0, sizeof(rcomp)); + + strscpy(rcomp.type, "compression", sizeof(rcomp.type)); + + return nla_put(skb, CRYPTOCFGA_STAT_COMPRESS, sizeof(rcomp), &rcomp); +} + +static int crypto_reportstat_one(struct crypto_alg *alg, + struct crypto_user_alg *ualg, + struct sk_buff *skb) +{ + memset(ualg, 0, sizeof(*ualg)); + + strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); + strscpy(ualg->cru_driver_name, alg->cra_driver_name, + sizeof(ualg->cru_driver_name)); + strscpy(ualg->cru_module_name, module_name(alg->cra_module), + sizeof(ualg->cru_module_name)); + + ualg->cru_type = 0; + ualg->cru_mask = 0; + ualg->cru_flags = alg->cra_flags; + ualg->cru_refcnt = refcount_read(&alg->cra_refcnt); + + if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) + goto nla_put_failure; + if (alg->cra_flags & CRYPTO_ALG_LARVAL) { + struct crypto_stat_larval rl; + + memset(&rl, 0, sizeof(rl)); + strscpy(rl.type, "larval", sizeof(rl.type)); + if (nla_put(skb, CRYPTOCFGA_STAT_LARVAL, sizeof(rl), &rl)) + goto nla_put_failure; + goto out; + } + + if (alg->cra_type && alg->cra_type->report_stat) { + if (alg->cra_type->report_stat(skb, alg)) + goto nla_put_failure; + goto out; + } + + switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { + case CRYPTO_ALG_TYPE_CIPHER: + if (crypto_report_cipher(skb, alg)) + goto nla_put_failure; + break; + case CRYPTO_ALG_TYPE_COMPRESS: + if (crypto_report_comp(skb, alg)) + goto nla_put_failure; + break; + default: + pr_err("ERROR: Unhandled alg %d in %s\n", + alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL), + __func__); + } + +out: + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static int crypto_reportstat_alg(struct crypto_alg *alg, + struct crypto_dump_info *info) +{ + struct sk_buff *in_skb = info->in_skb; + struct sk_buff *skb = info->out_skb; + struct nlmsghdr *nlh; + struct crypto_user_alg *ualg; + int err = 0; + + nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, + CRYPTO_MSG_GETSTAT, sizeof(*ualg), info->nlmsg_flags); + if (!nlh) { + err = -EMSGSIZE; + goto out; + } + + ualg = nlmsg_data(nlh); + + err = crypto_reportstat_one(alg, ualg, skb); + if (err) { + nlmsg_cancel(skb, nlh); + goto out; + } + + nlmsg_end(skb, nlh); + +out: + return err; +} + +int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, + struct nlattr **attrs) +{ + struct net *net = sock_net(in_skb->sk); + struct crypto_user_alg *p = nlmsg_data(in_nlh); + struct crypto_alg *alg; + struct sk_buff *skb; + struct crypto_dump_info info; + int err; + + if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) + return -EINVAL; + + alg = crypto_alg_match(p, 0); + if (!alg) + return -ENOENT; + + err = -ENOMEM; + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); + if (!skb) + goto drop_alg; + + info.in_skb = in_skb; + info.out_skb = skb; + info.nlmsg_seq = in_nlh->nlmsg_seq; + info.nlmsg_flags = 0; + + err = crypto_reportstat_alg(alg, &info); + +drop_alg: + crypto_mod_put(alg); + + if (err) { + kfree_skb(skb); + return err; + } + + return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid); +} + +MODULE_LICENSE("GPL"); |