File _service:obs_scm:backport-evaluate-do-not-remov... of Package nftables

File _service:obs_scm:backport-evaluate-do-not-remove-anonymous-set-with-protocol-f.patch of Package nftables

From 01167c393a12c74c6f9a3015b75702964ff5bcda Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 28 Aug 2023 22:47:05 +0200
Subject: [PATCH] evaluate: do not remove anonymous set with protocol flags and
 single element

Set lookups with flags search for an exact match, however:

tcp flags { syn }

gets transformed into:

tcp flags syn

which is matching on the syn flag only (non-exact match).

This optimization is safe for ct state though, because only one bit is
ever set on in the ct state bitmask.

Since protocol flags allow for combining flags, skip this optimization
to retain exact match semantics.

Another possible solution is to turn OP_IMPLICIT into OP_EQ for exact
flag match to re-introduce this optimization and deal with this corner
case.

Fixes: fee6bda06403 ("evaluate: remove anon sets with exactly one element")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/evaluate.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/evaluate.c b/src/evaluate.c
index c13be824..b5326d7d 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1817,7 +1817,12 @@ static int expr_evaluate_set(struct eval_ctx *ctx, struct expr **expr)
 			set->set_flags |= NFT_SET_CONCAT;
 	} else if (set->size == 1) {
 		i = list_first_entry(&set->expressions, struct expr, list);
-		if (i->etype == EXPR_SET_ELEM && list_empty(&i->stmt_list)) {
+		if (i->etype == EXPR_SET_ELEM &&
+		    (!i->dtype->basetype ||
+		     i->dtype->basetype->type != TYPE_BITMASK ||
+		     i->dtype->type == TYPE_CT_STATE) &&
+		    list_empty(&i->stmt_list)) {
+
 			switch (i->key->etype) {
 			case EXPR_PREFIX:
 			case EXPR_RANGE:
-- 
2.33.0