netlink: allow be16 and be32 types in all uint policy checks

__NLA_IS_BEINT_TYPE(tp) isn't useful.  NLA_BE16/32 are identical to
NLA_U16/32, the only difference is that it tells the netlink validation
functions that byteorder conversion might be needed before comparing
the value to the policy min/max ones.

After this change all policy macros that can be used with UINT types,
such as NLA_POLICY_MASK() can also be used with NLA_BE16/32.

This will be used to validate nf_tables flag attributes which
are in bigendian byte order.

Signed-off-by: Florian Westphal <fw@strlen.de>

diff --git a/include/net/netlink.h b/include/net/netlink.h
index b12cd95..8a7cd11 100644 (file)
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -375,12 +375,11 @@ struct nla_policy {
 #define NLA_POLICY_BITFIELD32(valid) \
        { .type = NLA_BITFIELD32, .bitfield32_valid = valid }
 
-#define __NLA_IS_UINT_TYPE(tp)                                         \
-       (tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || tp == NLA_U64)
+#define __NLA_IS_UINT_TYPE(tp)                                 \
+       (tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 ||      \
+        tp == NLA_U64 || tp == NLA_BE16 || tp == NLA_BE32)
 #define __NLA_IS_SINT_TYPE(tp)                                         \
        (tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64)
-#define __NLA_IS_BEINT_TYPE(tp)                                                \
-       (tp == NLA_BE16 || tp == NLA_BE32)
 
 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
 #define NLA_ENSURE_UINT_TYPE(tp)                       \
@@ -394,7 +393,6 @@ struct nla_policy {
 #define NLA_ENSURE_INT_OR_BINARY_TYPE(tp)              \
        (__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) ||         \
                      __NLA_IS_SINT_TYPE(tp) ||         \
-                     __NLA_IS_BEINT_TYPE(tp) ||        \
                      tp == NLA_MSECS ||                \
                      tp == NLA_BINARY) + tp)
 #define NLA_ENSURE_NO_VALIDATION_PTR(tp)               \
@@ -402,8 +400,6 @@ struct nla_policy {
                      tp != NLA_REJECT &&               \
                      tp != NLA_NESTED &&               \
                      tp != NLA_NESTED_ARRAY) + tp)
-#define NLA_ENSURE_BEINT_TYPE(tp)                      \
-       (__NLA_ENSURE(__NLA_IS_BEINT_TYPE(tp)) + tp)
 
 #define NLA_POLICY_RANGE(tp, _min, _max) {             \
        .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp),      \

diff --git a/lib/nlattr.c b/lib/nlattr.c
index 489e15b..7a2b6c3 100644 (file)
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -355,6 +355,12 @@ static int nla_validate_mask(const struct nla_policy *pt,
        case NLA_U64:
                value = nla_get_u64(nla);
                break;
+       case NLA_BE16:
+               value = ntohs(nla_get_be16(nla));
+               break;
+       case NLA_BE32:
+               value = ntohl(nla_get_be32(nla));
+               break;
        default:
                return -EINVAL;
        }