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/match.c b/src/expr/match.c
index ddecb43..2929b43 100644
--- a/src/expr/match.c
+++ b/src/expr/match.c
@@ -109,7 +109,7 @@ static int nftnl_expr_match_cb(const struct nlattr *attr, void *data)
 }
 
 static void
-nftnl_expr_match_build(struct nlmsghdr *nlh, struct nftnl_expr *e)
+nftnl_expr_match_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
 {
 	struct nftnl_expr_match *mt = nftnl_expr_data(e);
 
@@ -203,7 +203,7 @@ static int nftnl_expr_match_xml_parse(struct nftnl_expr *e, mxml_node_t *tree,
 }
 
 static int nftnl_expr_match_export(char *buf, size_t size,
-				      struct nftnl_expr *e, int type)
+				   const struct nftnl_expr *e, int type)
 {
 	struct nftnl_expr_match *mt = nftnl_expr_data(e);
 	NFTNL_BUF_INIT(b, buf, size);
@@ -216,7 +216,7 @@ static int nftnl_expr_match_export(char *buf, size_t size,
 
 static int
 nftnl_expr_match_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_match *match = nftnl_expr_data(e);
 
@@ -233,7 +233,7 @@ nftnl_expr_match_snprintf(char *buf, size_t len, uint32_t type,
 	return -1;
 }
 
-static void nftnl_expr_match_free(struct nftnl_expr *e)
+static void nftnl_expr_match_free(const struct nftnl_expr *e)
 {
 	struct nftnl_expr_match *match = nftnl_expr_data(e);