[nft PATCH 3/7] libnftables: Introduce nft_ctx_flush_cache()

[Phil Sutter <phil@nwl.cc>]

This allows an application to explicitly flush caches associated with a
given nft context.

Note that this is a bit inconsistent in that it releases the global
interface cache, but nft_ctx_free() does the same so at least it's not a
regression.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 include/nftables/nftables.h | 1 +
 src/libnftables.c           | 9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/nftables/nftables.h b/include/nftables/nftables.h
index 052a77bfb5371..fbc6fd4252a97 100644
--- a/include/nftables/nftables.h
+++ b/include/nftables/nftables.h
@@ -77,6 +77,7 @@ enum nftables_exit_codes {
 struct nft_ctx *nft_ctx_new(uint32_t flags);
 void nft_ctx_free(struct nft_ctx *ctx);
 FILE *nft_ctx_set_output(struct nft_ctx *ctx, FILE *fp);
+void nft_ctx_flush_cache(struct nft_ctx *ctx);
 
 int nft_run(struct nft_ctx *nft, struct mnl_socket *nf_sock,
 	    void *scanner, struct parser_state *state,
diff --git a/src/libnftables.c b/src/libnftables.c
index 187747c66af21..0de50c854d572 100644
--- a/src/libnftables.c
+++ b/src/libnftables.c
@@ -146,13 +146,18 @@ struct nft_ctx *nft_ctx_new(uint32_t flags)
 	return ctx;
 }
 
+void nft_ctx_flush_cache(struct nft_ctx *ctx)
+{
+	iface_cache_release();
+	cache_release(&ctx->cache);
+}
+
 void nft_ctx_free(struct nft_ctx *ctx)
 {
 	if (ctx->nf_sock)
 		netlink_close_sock(ctx->nf_sock);
 
-	iface_cache_release();
-	cache_release(&ctx->cache);
+	nft_ctx_flush_cache(ctx);
 	xfree(ctx);
 	nft_exit();
 }
-- 
2.13.1