src: Implement rule comparison

This patch implements the function:

	bool nftnl_rule_cmp(const struct nftnl_rule *r1,
			    const struct nftnl_rule *r2)

for rule comparison.

Expressions within rules need to be compared, so also has been created the
function:

	bool nftnl_expr_cmp(const struct nftnl_expr *e1,
			    const struct nftnl_expr *e2);

Also includes all expression comparators.

Signed-off-by: Carlos Falgueras García <carlosfg@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/expr.c b/src/expr.c
index e5c1dd3..51413ab 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -203,6 +203,16 @@ const char *nftnl_expr_get_str(const struct nftnl_expr *expr, uint16_t type)
 }
 EXPORT_SYMBOL_ALIAS(nftnl_expr_get_str, nft_rule_expr_get_str);
 
+bool nftnl_expr_cmp(const struct nftnl_expr *e1, const struct nftnl_expr *e2)
+{
+	if (e1->flags != e2->flags ||
+	    strcmp(e1->ops->name, e2->ops->name) != 0)
+		return false;
+
+	return e1->ops->cmp(e1, e2);
+}
+EXPORT_SYMBOL(nftnl_expr_cmp);
+
 void
 nftnl_expr_build_payload(struct nlmsghdr *nlh, struct nftnl_expr *expr)
 {