[CRYPTO] api: Add support for multiple template parameters

This patch adds support for having multiple parameters to
a template, separated by a comma.  It also adds support
for integer parameters in addition to the current algorithm
parameter type.

This will be used by the authenc template which will have
four parameters: the authentication algorithm, the encryption
algorithm, the authentication size and the encryption key
length.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 84 insertions, 27 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 38aa9e994703..d9559609b525 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -439,13 +439,15 @@ EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 
 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 {
-        struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
+        struct rtattr *rta = tb[0];
         struct crypto_attr_type *algt;
 
         if (!rta)
                 return ERR_PTR(-ENOENT);
         if (RTA_PAYLOAD(rta) < sizeof(*algt))
                 return ERR_PTR(-EINVAL);
+        if (rta->rta_type != CRYPTOA_TYPE)
+                return ERR_PTR(-EINVAL);
 
         algt = RTA_DATA(rta);
 
@@ -470,13 +472,15 @@ EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 
 struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
 {
-        struct rtattr *rta = tb[CRYPTOA_ALG - 1];
+        struct rtattr *rta = tb[1];
         struct crypto_attr_alg *alga;
 
         if (!rta)
                 return ERR_PTR(-ENOENT);
         if (RTA_PAYLOAD(rta) < sizeof(*alga))
                 return ERR_PTR(-EINVAL);
+        if (rta->rta_type != CRYPTOA_ALG)
+                return ERR_PTR(-EINVAL);
 
         alga = RTA_DATA(rta);
         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
diff --git a/crypto/cryptomgr.c b/crypto/cryptomgr.c
index e5fb7cca5107..c83884fec5f9 100644
--- a/crypto/cryptomgr.c
+++ b/crypto/cryptomgr.c
@@ -24,22 +24,26 @@
 #include "internal.h"
 
 struct cryptomgr_param {
-        struct rtattr *tb[CRYPTOA_MAX];
+        struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
 
         struct {
                 struct rtattr attr;
                 struct crypto_attr_type data;
         } type;
 
-        struct {
+        union {
                 struct rtattr attr;
-                struct crypto_attr_alg data;
-        } alg;
-
-        struct {
-                char name[CRYPTO_MAX_ALG_NAME];
-        } larval;
-
+                struct {
+                        struct rtattr attr;
+                        struct crypto_attr_alg data;
+                } alg;
+                struct {
+                        struct rtattr attr;
+                        struct crypto_attr_u32 data;
+                } nu32;
+        } attrs[CRYPTO_MAX_ATTRS];
+
+        char larval[CRYPTO_MAX_ALG_NAME];
         char template[CRYPTO_MAX_ALG_NAME];
 };
 
@@ -72,7 +76,7 @@ out:
         module_put_and_exit(0);
 
 err:
-        crypto_larval_error(param->larval.name, param->type.data.type,
+        crypto_larval_error(param->larval, param->type.data.type,
                             param->type.data.mask);
         goto out;
 }
@@ -84,6 +88,7 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
         const char *name = larval->alg.cra_name;
         const char *p;
         unsigned int len;
+        int i;
 
         if (!try_module_get(THIS_MODULE))
                 goto err;
@@ -101,33 +106,73 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
 
         memcpy(param->template, name, len);
 
-        name = p + 1;
-        len = 0;
-        for (p = name; *p; p++) {
-                for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++)
-                        ;
+        i = 0;
+        for (;;) {
+                int notnum = 0;
 
-                if (*p != ')')
-                        goto err_free_param;
+                name = ++p;
+                len = 0;
+
+                for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
+                        notnum |= !isdigit(*p);
+
+                if (*p == '(') {
+                        int recursion = 0;
+
+                        for (;;) {
+                                if (!*++p)
+                                        goto err_free_param;
+                                if (*p == '(')
+                                        recursion++;
+                                else if (*p == ')' && !recursion--)
+                                        break;
+                        }
+
+                        notnum = 1;
+                }
 
                 len = p - name;
+                if (!len)
+                        goto err_free_param;
+
+                if (notnum) {
+                        param->attrs[i].alg.attr.rta_len =
+                                sizeof(param->attrs[i].alg);
+                        param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
+                        memcpy(param->attrs[i].alg.data.name, name, len);
+                } else {
+                        param->attrs[i].nu32.attr.rta_len =
+                                sizeof(param->attrs[i].nu32);
+                        param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
+                        param->attrs[i].nu32.data.num =
+                                simple_strtol(name, NULL, 0);
+                }
+
+                param->tb[i + 1] = &param->attrs[i].attr;
+                i++;
+
+                if (WARN_ON(i >= CRYPTO_MAX_ATTRS))
+                        goto err_free_param;
+
+                if (*p == ')')
+                        break;
+
+                if (*p != ',')
+                        goto err_free_param;
         }
 
-        if (!len || name[len + 1])
+        if (!i)
                 goto err_free_param;
 
+        param->tb[i + 1] = NULL;
+
         param->type.attr.rta_len = sizeof(param->type);
         param->type.attr.rta_type = CRYPTOA_TYPE;
         param->type.data.type = larval->alg.cra_flags;
         param->type.data.mask = larval->mask;
-        param->tb[CRYPTOA_TYPE - 1] = &param->type.attr;
-
-        param->alg.attr.rta_len = sizeof(param->alg);
-        param->alg.attr.rta_type = CRYPTOA_ALG;
-        memcpy(param->alg.data.name, name, len);
-        param->tb[CRYPTOA_ALG - 1] = &param->alg.attr;
+        param->tb[0] = &param->type.attr;
 
-        memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
+        memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
 
         thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
         if (IS_ERR(thread))
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 1072f9abaef6..da09b4ac3ae9 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -425,11 +425,15 @@ enum {
         CRYPTOA_UNSPEC,
         CRYPTOA_ALG,
         CRYPTOA_TYPE,
+        CRYPTOA_U32,
         __CRYPTOA_MAX,
 };
 
 #define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
 
+/* Maximum number of (rtattr) parameters for each template. */
+#define CRYPTO_MAX_ATTRS 32
+
 struct crypto_attr_alg {
         char name[CRYPTO_MAX_ALG_NAME];
 };
@@ -439,6 +443,10 @@ struct crypto_attr_type {
         u32 mask;
 };
 
+struct crypto_attr_u32 {
+        u32 num;
+};
+
 /* 
  * Transform user interface.
  */