datatype: fix mark parsing if string is used

This fixes string mark parsing. Note that /etc/iproute2/rt_marks may
contain mapping between string and mark values.

This fixes here:

add rule filter output meta mark 0 counter

Assumming that:

cat /etc/iproute2/rt_marks

says:

0 test

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

1 files changed, 11 insertions, 0 deletions

diff --git a/src/datatype.c b/src/datatype.c
index 12e876cf..c4fc131d 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -632,6 +632,17 @@ static struct error_record *mark_type_parse(const struct expr *sym,
 					    struct expr **res)
 {
 	struct error_record *erec;
+	const struct symbolic_constant *s;
+
+	for (s = mark_tbl->symbols; s->identifier != NULL; s++) {
+		if (!strcmp(sym->identifier, s->identifier)) {
+			*res = constant_expr_alloc(&sym->location, sym->dtype,
+						   sym->dtype->byteorder,
+						   sym->dtype->size,
+						   &s->value);
+			return NULL;
+		}
+	}
 
 	erec = sym->dtype->basetype->parse(sym, res);
 	if (erec != NULL)