libnftnl: constify object arguments to various functions

flow table support needs constant object arguments to printing functions
to avoid ugly casts. While at it, also constify object arguments to message
construction, destructor and a few helper functions.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/expr/target.c b/src/expr/target.c
index cbbee60..68a7d8a 100644
--- a/src/expr/target.c
+++ b/src/expr/target.c
@@ -109,7 +109,7 @@ static int nftnl_expr_target_cb(const struct nlattr *attr, void *data)
 }
 
 static void
-nftnl_expr_target_build(struct nlmsghdr *nlh, struct nftnl_expr *e)
+nftnl_expr_target_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
 {
 	struct nftnl_expr_target *tg = nftnl_expr_data(e);
 
@@ -204,7 +204,7 @@ nftnl_expr_target_xml_parse(struct nftnl_expr *e, mxml_node_t *tree,
 }
 
 static int nftnl_rule_exp_target_export(char *buf, size_t size,
-				      struct nftnl_expr *e, int type)
+				        const struct nftnl_expr *e, int type)
 {
 	struct nftnl_expr_target *target = nftnl_expr_data(e);
 	NFTNL_BUF_INIT(b, buf, size);
@@ -217,7 +217,7 @@ static int nftnl_rule_exp_target_export(char *buf, size_t size,
 
 static int
 nftnl_expr_target_snprintf(char *buf, size_t len, uint32_t type,
-			      uint32_t flags, struct nftnl_expr *e)
+			   uint32_t flags, const struct nftnl_expr *e)
 {
 	struct nftnl_expr_target *target = nftnl_expr_data(e);
 
@@ -234,7 +234,7 @@ nftnl_expr_target_snprintf(char *buf, size_t len, uint32_t type,
 	return -1;
 }
 
-static void nftnl_expr_target_free(struct nftnl_expr *e)
+static void nftnl_expr_target_free(const struct nftnl_expr *e)
 {
 	struct nftnl_expr_target *target = nftnl_expr_data(e);