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, 17 insertions, 0 deletions

diff --git a/tests/shell/testcases/sets/typeof_raw_0 b/tests/shell/testcases/sets/typeof_raw_0
new file mode 100755
index 00000000..36396b5c
--- /dev/null
+++ b/tests/shell/testcases/sets/typeof_raw_0
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+EXPECTED="table inet t {
+	set y {
+		typeof ip daddr . @ih,32,32
+		elements = { 1.1.1.1 . 0x14, 2.2.2.2 . 0x20}
+	}
+
+	chain y {
+		ip saddr . @ih,32,32 { 1.1.1.1 . 0x14, 2.2.2.2 . 0x1e }
+		ip daddr . @ih,32,32 @y
+	}
+}"
+
+set -e
+$NFT -f - <<< $EXPECTED
+