[PATCH nft 4/4] src: remove flagcmp expression

[Pablo Neira Ayuso <pablo@netfilter.org>]

This expression is not used anymore, since:

 ("src: transform flag match expression to binop expression from parser")

remove it.

This completes the revert of c3d57114f119 ("parser_bison: add shortcut
syntax for matching flags without binary operations"), except the parser
chunk for backwards compatibility.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/expression.h | 14 +----------
 include/json.h       |  2 --
 src/evaluate.c       | 21 -----------------
 src/expression.c     | 56 --------------------------------------------
 src/json.c           | 14 -----------
 5 files changed, 1 insertion(+), 106 deletions(-)

diff --git a/include/expression.h b/include/expression.h
index 818d7a7dc74b..8399fae88d78 100644
--- a/include/expression.h
+++ b/include/expression.h
@@ -47,7 +47,6 @@
  * @EXPR_FIB		forward information base expression
  * @EXPR_XFRM		XFRM (ipsec) expression
  * @EXPR_SET_ELEM_CATCHALL catchall element expression
- * @EXPR_FLAGCMP	flagcmp expression
  * @EXPR_RANGE_VALUE	constant range expression
  * @EXPR_RANGE_SYMBOL	unparse symbol range expression
  */
@@ -81,11 +80,10 @@ enum expr_types {
 	EXPR_FIB,
 	EXPR_XFRM,
 	EXPR_SET_ELEM_CATCHALL,
-	EXPR_FLAGCMP,
 	EXPR_RANGE_VALUE,
 	EXPR_RANGE_SYMBOL,
 
-	EXPR_MAX = EXPR_FLAGCMP
+	EXPR_MAX = EXPR_SET_ELEM_CATCHALL
 };
 
 enum ops {
@@ -402,12 +400,6 @@ struct expr {
 			uint8_t			ttl;
 			uint32_t		flags;
 		} osf;
-		struct {
-			/* EXPR_FLAGCMP */
-			struct expr		*expr;
-			struct expr		*mask;
-			struct expr		*value;
-		} flagcmp;
 	};
 };
 
@@ -544,10 +536,6 @@ extern struct expr *set_elem_expr_alloc(const struct location *loc,
 
 struct expr *set_elem_catchall_expr_alloc(const struct location *loc);
 
-struct expr *flagcmp_expr_alloc(const struct location *loc, enum ops op,
-				struct expr *expr, struct expr *mask,
-				struct expr *value);
-
 extern void range_expr_value_low(mpz_t rop, const struct expr *expr);
 extern void range_expr_value_high(mpz_t rop, const struct expr *expr);
 void range_expr_swap_values(struct expr *range);
diff --git a/include/json.h b/include/json.h
index 0670b8714519..b61eeafe8d7e 100644
--- a/include/json.h
+++ b/include/json.h
@@ -29,7 +29,6 @@ struct list_head;
 
 json_t *binop_expr_json(const struct expr *expr, struct output_ctx *octx);
 json_t *relational_expr_json(const struct expr *expr, struct output_ctx *octx);
-json_t *flagcmp_expr_json(const struct expr *expr, struct output_ctx *octx);
 json_t *range_expr_json(const struct expr *expr, struct output_ctx *octx);
 json_t *meta_expr_json(const struct expr *expr, struct output_ctx *octx);
 json_t *payload_expr_json(const struct expr *expr, struct output_ctx *octx);
@@ -137,7 +136,6 @@ static inline json_t *name##_json(arg1_t arg1, arg2_t arg2) { return NULL; }
 	JSON_PRINT_STUB(name##_stmt, const struct stmt *, struct output_ctx *)
 
 EXPR_PRINT_STUB(binop_expr)
-EXPR_PRINT_STUB(flagcmp_expr)
 EXPR_PRINT_STUB(relational_expr)
 EXPR_PRINT_STUB(range_expr)
 EXPR_PRINT_STUB(meta_expr)
diff --git a/src/evaluate.c b/src/evaluate.c
index a27961193da5..8a61dcc4a4e9 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -2977,25 +2977,6 @@ static int expr_evaluate_xfrm(struct eval_ctx *ctx, struct expr **exprp)
 	return expr_evaluate_primary(ctx, exprp);
 }
 
-static int expr_evaluate_flagcmp(struct eval_ctx *ctx, struct expr **exprp)
-{
-	struct expr *expr = *exprp, *binop, *rel;
-
-	if (expr->op != OP_EQ &&
-	    expr->op != OP_NEQ)
-		return expr_error(ctx->msgs, expr, "either == or != is allowed");
-
-	binop = binop_expr_alloc(&expr->location, OP_AND,
-				 expr_get(expr->flagcmp.expr),
-				 expr_get(expr->flagcmp.mask));
-	rel = relational_expr_alloc(&expr->location, expr->op, binop,
-				    expr_get(expr->flagcmp.value));
-	expr_free(expr);
-	*exprp = rel;
-
-	return expr_evaluate(ctx, exprp);
-}
-
 static int verdict_validate_chainlen(struct eval_ctx *ctx,
 				     struct expr *chain)
 {
@@ -3095,8 +3076,6 @@ static int expr_evaluate(struct eval_ctx *ctx, struct expr **expr)
 		return expr_evaluate_xfrm(ctx, expr);
 	case EXPR_SET_ELEM_CATCHALL:
 		return expr_evaluate_set_elem_catchall(ctx, expr);
-	case EXPR_FLAGCMP:
-		return expr_evaluate_flagcmp(ctx, expr);
 	case EXPR_RANGE_SYMBOL:
 		return expr_evaluate_symbol_range(ctx, expr);
 	default:
diff --git a/src/expression.c b/src/expression.c
index 2a30d5af92a4..fdf9fb97daac 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -1680,61 +1680,6 @@ struct expr *set_elem_catchall_expr_alloc(const struct location *loc)
 	return expr;
 }
 
-static void flagcmp_expr_print(const struct expr *expr, struct output_ctx *octx)
-{
-	expr_print(expr->flagcmp.expr, octx);
-
-	if (expr->op == OP_NEQ)
-		nft_print(octx, " != ");
-	else
-		nft_print(octx, " ");
-
-	expr_print(expr->flagcmp.value, octx);
-	nft_print(octx, " / ");
-	expr_print(expr->flagcmp.mask, octx);
-}
-
-static void flagcmp_expr_clone(struct expr *new, const struct expr *expr)
-{
-	new->flagcmp.expr = expr_clone(expr->flagcmp.expr);
-	new->flagcmp.mask = expr_clone(expr->flagcmp.mask);
-	new->flagcmp.value = expr_clone(expr->flagcmp.value);
-}
-
-static void flagcmp_expr_destroy(struct expr *expr)
-{
-	expr_free(expr->flagcmp.expr);
-	expr_free(expr->flagcmp.mask);
-	expr_free(expr->flagcmp.value);
-}
-
-static const struct expr_ops flagcmp_expr_ops = {
-	.type		= EXPR_FLAGCMP,
-	.name		= "flags comparison",
-	.print		= flagcmp_expr_print,
-	.json		= flagcmp_expr_json,
-	.clone		= flagcmp_expr_clone,
-	.destroy	= flagcmp_expr_destroy,
-};
-
-struct expr *flagcmp_expr_alloc(const struct location *loc, enum ops op,
-				struct expr *match, struct expr *mask,
-				struct expr *value)
-{
-	struct expr *expr;
-
-	expr = expr_alloc(loc, EXPR_FLAGCMP, match->dtype, match->byteorder,
-			  match->len);
-	expr->op = op;
-	expr->flagcmp.expr = match;
-	expr->flagcmp.mask = mask;
-	/* json output needs this operation for compatibility */
-	expr->flagcmp.mask->op = OP_OR;
-	expr->flagcmp.value = value;
-
-	return expr;
-}
-
 void range_expr_value_low(mpz_t rop, const struct expr *expr)
 {
 	switch (expr->etype) {
@@ -1814,7 +1759,6 @@ static const struct expr_ops *__expr_ops_by_type(enum expr_types etype)
 	case EXPR_FIB: return &fib_expr_ops;
 	case EXPR_XFRM: return &xfrm_expr_ops;
 	case EXPR_SET_ELEM_CATCHALL: return &set_elem_catchall_expr_ops;
-	case EXPR_FLAGCMP: return &flagcmp_expr_ops;
 	case EXPR_RANGE_VALUE: return &constant_range_expr_ops;
 	case EXPR_RANGE_SYMBOL: return &symbol_range_expr_ops;
 	}
diff --git a/src/json.c b/src/json.c
index 96413d70895a..d15e7017b892 100644
--- a/src/json.c
+++ b/src/json.c
@@ -547,20 +547,6 @@ static json_t *table_print_json(const struct table *table)
 	return json_pack("{s:o}", "table", root);
 }
 
-json_t *flagcmp_expr_json(const struct expr *expr, struct output_ctx *octx)
-{
-	json_t *left;
-
-	left = json_pack("{s:[o, o]}", expr_op_symbols[OP_AND],
-			 expr_print_json(expr->flagcmp.expr, octx),
-			 expr_print_json(expr->flagcmp.mask, octx));
-
-	return json_pack("{s:{s:s, s:o, s:o}}", "match",
-			 "op", expr_op_symbols[expr->op] ? : "in",
-			 "left", left,
-			 "right", expr_print_json(expr->flagcmp.value, octx));
-}
-
 static json_t *
 __binop_expr_json(int op, const struct expr *expr, struct output_ctx *octx)
 {
-- 
2.30.2