crypto: Add userspace report for aead type algorithms

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

2 files changed, 34 insertions, 0 deletions

diff --git a/crypto/aead.c b/crypto/aead.c
index 6729e8ff68e7..bb641bd0285b 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -21,6 +21,8 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/seq_file.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
 
 #include "internal.h"
 
@@ -109,6 +111,28 @@ static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
         return 0;
 }
 
+static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        struct crypto_report_aead raead;
+        struct aead_alg *aead = &alg->cra_aead;
+
+        snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "aead");
+        snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s",
+                 aead->geniv ?: "<built-in>");
+
+        raead.blocksize = alg->cra_blocksize;
+        raead.maxauthsize = aead->maxauthsize;
+        raead.ivsize = aead->ivsize;
+
+        NLA_PUT(skb, CRYPTOCFGA_REPORT_AEAD,
+                sizeof(struct crypto_report_aead), &raead);
+
+        return 0;
+
+nla_put_failure:
+        return -EMSGSIZE;
+}
+
 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
         __attribute__ ((unused));
 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
@@ -130,6 +154,7 @@ const struct crypto_type crypto_aead_type = {
 #ifdef CONFIG_PROC_FS
         .show = crypto_aead_show,
 #endif
+        .report = crypto_aead_report,
 };
 EXPORT_SYMBOL_GPL(crypto_aead_type);
 
diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index a96a1a11ee66..48030c7dfb51 100644
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -39,6 +39,7 @@ enum crypto_attr_type_t {
         CRYPTOCFGA_REPORT_LARVAL,       /* struct crypto_report_larval */
         CRYPTOCFGA_REPORT_HASH,         /* struct crypto_report_hash */
         CRYPTOCFGA_REPORT_BLKCIPHER,    /* struct crypto_report_blkcipher */
+        CRYPTOCFGA_REPORT_AEAD,         /* struct crypto_report_aead */
         __CRYPTOCFGA_MAX
 
 #define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
@@ -72,3 +73,11 @@ struct crypto_report_blkcipher {
         unsigned int max_keysize;
         unsigned int ivsize;
 };
+
+struct crypto_report_aead {
+        char type[CRYPTO_MAX_NAME];
+        char geniv[CRYPTO_MAX_NAME];
+        unsigned int blocksize;
+        unsigned int maxauthsize;
+        unsigned int ivsize;
+};