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, 7 insertions, 7 deletions

diff --git a/include/libnftnl/gen.h b/include/libnftnl/gen.h
index 3eb8470..d0f638f 100644
--- a/include/libnftnl/gen.h
+++ b/include/libnftnl/gen.h
@@ -15,7 +15,7 @@ extern "C" {
 struct nftnl_gen;
 
 struct nftnl_gen *nftnl_gen_alloc(void);
-void nftnl_gen_free(struct nftnl_gen *);
+void nftnl_gen_free(const struct nftnl_gen *);
 
 enum {
 	NFTNL_GEN_ID 	= 0,
@@ -28,18 +28,18 @@ void nftnl_gen_unset(struct nftnl_gen *gen, uint16_t attr);
 void nftnl_gen_set(struct nftnl_gen *gen, uint16_t attr, const void *data);
 void nftnl_gen_set_data(struct nftnl_gen *gen, uint16_t attr,
 			     const void *data, uint32_t data_len);
-const void *nftnl_gen_get(struct nftnl_gen *gen, uint16_t attr);
-const void *nftnl_gen_get_data(struct nftnl_gen *gen, uint16_t attr,
-				    uint32_t *data_len);
+const void *nftnl_gen_get(const struct nftnl_gen *gen, uint16_t attr);
+const void *nftnl_gen_get_data(const struct nftnl_gen *gen, uint16_t attr,
+			       uint32_t *data_len);
 
 void nftnl_gen_set_u32(struct nftnl_gen *gen, uint16_t attr, uint32_t data);
-uint32_t nftnl_gen_get_u32(struct nftnl_gen *gen, uint16_t attr);
+uint32_t nftnl_gen_get_u32(const struct nftnl_gen *gen, uint16_t attr);
 
 struct nlmsghdr;
 int nftnl_gen_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_gen *gen);
 
-int nftnl_gen_snprintf(char *buf, size_t size, struct nftnl_gen *gen, uint32_t type, uint32_t flags);
-int nftnl_gen_fprintf(FILE *fp, struct nftnl_gen *gen, uint32_t type, uint32_t flags);
+int nftnl_gen_snprintf(char *buf, size_t size, const struct nftnl_gen *gen, uint32_t type, uint32_t flags);
+int nftnl_gen_fprintf(FILE *fp, const struct nftnl_gen *gen, uint32_t type, uint32_t flags);
 
 #define nftnl_gen_nlmsg_build_hdr	nftnl_nlmsg_build_hdr
 int nftnl_gen_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_gen *gen);