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![Herbert Xu](/assets/img/avatar_default.png)
Move all stat code specific to rng into the rng code. While we're at it, change the stats so that bytes and counts are always incremented even in case of error. This allows the reference counting to be removed as we can now increment the counters prior to the operation. After the operation we simply increase the error count if necessary. This is safe as errors can only occur synchronously (or rather, the existing code already ignored asynchronous errors which are only visible to the callback function). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
176 lines
4 KiB
C
176 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Crypto user configuration API.
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*
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* Copyright (C) 2017-2018 Corentin Labbe <clabbe@baylibre.com>
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/cryptouser.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include <net/sock.h>
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#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
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struct crypto_dump_info {
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struct sk_buff *in_skb;
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struct sk_buff *out_skb;
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u32 nlmsg_seq;
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u16 nlmsg_flags;
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};
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static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_stat_cipher rcipher;
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memset(&rcipher, 0, sizeof(rcipher));
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strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
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return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
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}
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static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_stat_compress rcomp;
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memset(&rcomp, 0, sizeof(rcomp));
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strscpy(rcomp.type, "compression", sizeof(rcomp.type));
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return nla_put(skb, CRYPTOCFGA_STAT_COMPRESS, sizeof(rcomp), &rcomp);
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}
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static int crypto_reportstat_one(struct crypto_alg *alg,
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struct crypto_user_alg *ualg,
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struct sk_buff *skb)
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{
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memset(ualg, 0, sizeof(*ualg));
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strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
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strscpy(ualg->cru_driver_name, alg->cra_driver_name,
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sizeof(ualg->cru_driver_name));
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strscpy(ualg->cru_module_name, module_name(alg->cra_module),
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sizeof(ualg->cru_module_name));
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ualg->cru_type = 0;
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ualg->cru_mask = 0;
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ualg->cru_flags = alg->cra_flags;
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ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
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if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
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goto nla_put_failure;
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if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
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struct crypto_stat_larval rl;
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memset(&rl, 0, sizeof(rl));
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strscpy(rl.type, "larval", sizeof(rl.type));
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if (nla_put(skb, CRYPTOCFGA_STAT_LARVAL, sizeof(rl), &rl))
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goto nla_put_failure;
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goto out;
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}
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if (alg->cra_type && alg->cra_type->report_stat) {
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if (alg->cra_type->report_stat(skb, alg))
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goto nla_put_failure;
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goto out;
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}
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switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
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case CRYPTO_ALG_TYPE_CIPHER:
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if (crypto_report_cipher(skb, alg))
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goto nla_put_failure;
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break;
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case CRYPTO_ALG_TYPE_COMPRESS:
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if (crypto_report_comp(skb, alg))
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goto nla_put_failure;
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break;
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default:
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pr_err("ERROR: Unhandled alg %d in %s\n",
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alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL),
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__func__);
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}
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out:
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_reportstat_alg(struct crypto_alg *alg,
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struct crypto_dump_info *info)
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{
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struct sk_buff *in_skb = info->in_skb;
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struct sk_buff *skb = info->out_skb;
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struct nlmsghdr *nlh;
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struct crypto_user_alg *ualg;
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int err = 0;
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nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
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CRYPTO_MSG_GETSTAT, sizeof(*ualg), info->nlmsg_flags);
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if (!nlh) {
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err = -EMSGSIZE;
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goto out;
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}
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ualg = nlmsg_data(nlh);
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err = crypto_reportstat_one(alg, ualg, skb);
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if (err) {
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nlmsg_cancel(skb, nlh);
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goto out;
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}
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nlmsg_end(skb, nlh);
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out:
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return err;
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}
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int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
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struct nlattr **attrs)
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{
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struct net *net = sock_net(in_skb->sk);
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struct crypto_user_alg *p = nlmsg_data(in_nlh);
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struct crypto_alg *alg;
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struct sk_buff *skb;
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struct crypto_dump_info info;
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int err;
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if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
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return -EINVAL;
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alg = crypto_alg_match(p, 0);
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if (!alg)
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return -ENOENT;
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err = -ENOMEM;
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skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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if (!skb)
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goto drop_alg;
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info.in_skb = in_skb;
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info.out_skb = skb;
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info.nlmsg_seq = in_nlh->nlmsg_seq;
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info.nlmsg_flags = 0;
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err = crypto_reportstat_alg(alg, &info);
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drop_alg:
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crypto_mod_put(alg);
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if (err) {
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kfree_skb(skb);
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return err;
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}
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return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
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}
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MODULE_LICENSE("GPL");
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