crypto: Add userspace report for blkcipher type algorithms

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 35 insertions, 0 deletions

diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 7a7219266e3c..2572d2600136 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -24,6 +24,8 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
 
 #include "internal.h"
 
@@ -492,6 +494,28 @@ static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
                 return crypto_init_blkcipher_ops_async(tfm);
 }
 
+static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        struct crypto_report_blkcipher rblkcipher;
+
+        snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "blkcipher");
+        snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
+                 alg->cra_blkcipher.geniv ?: "<default>");
+
+        rblkcipher.blocksize = alg->cra_blocksize;
+        rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
+        rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
+        rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
+
+        NLA_PUT(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
+                sizeof(struct crypto_report_blkcipher), &rblkcipher);
+
+        return 0;
+
+nla_put_failure:
+        return -EMSGSIZE;
+}
+
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
         __attribute__ ((unused));
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
@@ -511,6 +535,7 @@ const struct crypto_type crypto_blkcipher_type = {
 #ifdef CONFIG_PROC_FS
         .show = crypto_blkcipher_show,
 #endif
+        .report = crypto_blkcipher_report,
 };
 EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
 
diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index ee4688221975..a96a1a11ee66 100644
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -38,6 +38,7 @@ enum crypto_attr_type_t {
         CRYPTOCFGA_PRIORITY_VAL,        /* __u32 */
         CRYPTOCFGA_REPORT_LARVAL,       /* struct crypto_report_larval */
         CRYPTOCFGA_REPORT_HASH,         /* struct crypto_report_hash */
+        CRYPTOCFGA_REPORT_BLKCIPHER,    /* struct crypto_report_blkcipher */
         __CRYPTOCFGA_MAX
 
 #define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
@@ -62,3 +63,12 @@ struct crypto_report_hash {
         unsigned int blocksize;
         unsigned int digestsize;
 };
+
+struct crypto_report_blkcipher {
+        char type[CRYPTO_MAX_NAME];
+        char geniv[CRYPTO_MAX_NAME];
+        unsigned int blocksize;
+        unsigned int min_keysize;
+        unsigned int max_keysize;
+        unsigned int ivsize;
+};