src: allow to use typeof of raw expressions in set declaration

Use the dynamic datatype to allocate an instance of TYPE_INTEGER and set
length and byteorder. Add missing information to the set userdata area
for raw payload expressions which allows to rebuild the set typeof from
the listing path.

A few examples:

- With anonymous sets:

  nft add rule x y ip saddr . @ih,32,32 { 1.1.1.1 . 0x14, 2.2.2.2 . 0x1e }

- With named sets:

 table x {
        set y {
                typeof ip saddr . @ih,32,32
                elements = { 1.1.1.1 . 0x14 }
        }
 }

Incremental updates are also supported, eg.

 nft add element x y { 3.3.3.3 . 0x28 }

expr_evaluate_concat() is used to evaluate both set key definitions
and set key values, using two different function might help to simplify
this code in the future.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/datatype.c b/src/datatype.c
index b2e667ce..2e31c858 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -1136,7 +1136,7 @@ void datatype_set(struct expr *expr, const struct datatype *dtype)
 	expr->dtype = datatype_get(dtype);
 }
 
-static struct datatype *dtype_clone(const struct datatype *orig_dtype)
+struct datatype *dtype_clone(const struct datatype *orig_dtype)
 {
 	struct datatype *dtype;