[libmnl,6/9] mmap: add more helper - nonmin2

diff --git a/include/libmnl/libmnl.h b/include/libmnl/libmnl.h
index a8991ce..722cb79 100644
--- a/include/libmnl/libmnl.h
+++ b/include/libmnl/libmnl.h
@@ -229,6 +229,16 @@  extern int mnl_ring_poll(const struct mnl_ring_socket *nlm, int timeout);
 extern struct nl_mmap_hdr *mnl_ring_poll_rxframe(struct mnl_ring_socket *nlm);
 extern int mnl_ring_discard_frames(struct mnl_ring_socket *nlm, enum mnl_ring_types type);
 
+/* non-minimalistic 2 [nonmin2] */
+/* nlmsghdr building callback which returns buffer len */
+typedef int (*mnl_ring_build_t)(void *buf, void *data);
+extern int mnl_ring_build_frame(struct mnl_ring_socket *nlm, mnl_ring_build_t cb, void *data);
+extern int mnl_ring_parse_frame2(struct mnl_ring_socket *nlm, unsigned int seq, unsigned int portid,
+				 mnl_cb_t cb, void *data,
+				 mnl_cb_t *cb_ctl_array, unsigned int cb_ctl_array_len);
+extern int mnl_ring_parse_frame(struct mnl_ring_socket *nlm, unsigned int seq, unsigned int portid,
+				 mnl_cb_t cb, void *data);
+
 /*
  * other declarations
  */
diff --git a/src/libmnl.map b/src/libmnl.map
index 2a36a5c..d329988 100644
--- a/src/libmnl.map
+++ b/src/libmnl.map
@@ -82,4 +82,7 @@  LIBMNL_1.2 {
   mnl_ring_poll;
   mnl_ring_poll_rxframe;
   mnl_ring_discard_frames;
+  mnl_ring_build_frame;
+  mnl_ring_parse_frame2;
+  mnl_ring_parse_frame;
 } LIBMNL_1.1;
diff --git a/src/mmap.c b/src/mmap.c
index 78fbb1f..6a3af5a 100644
--- a/src/mmap.c
+++ b/src/mmap.c
@@ -384,3 +384,73 @@  int mnl_ring_discard_frames(struct mnl_ring_socket *nlm, enum mnl_ring_types typ
 	return 1;
 }
 EXPORT_SYMBOL(mnl_ring_discard_frames);
+
+/****
+ * non-minimalistic 2 [nonmin2]
+ ****/
+
+/**
+ * mnl_ring_build_frame - build tx frame using callback
+ * \param nlm ring descriptor
+ * \param cb frame building function
+ * \param data passing to cb
+ *
+ * shoud advance ring or not?
+ * cb receive tx frame pointer for nlmsghdr and should return whole nlmsgs
+ * length. Users do not need take care of struct nl_mmap_hdr
+ */
+int mnl_ring_build_frame(struct mnl_ring_socket *nlm, mnl_ring_build_t cb, void *data) {
+	struct nl_mmap_hdr *hdr;
+	int ret;
+
+	hdr = mnl_ring_get_frame(nlm, MNL_RING_TX);
+	if (hdr == NULL)
+		return -1;
+
+	ret = cb(MNL_MMAP_MSGHDR(hdr), data);
+	if (ret <= 0)
+		return ret;
+	hdr->nm_len = ret;
+	hdr->nm_status = NL_MMAP_STATUS_VALID;
+	/* mnl_ring_advance(nlm, MNL_RING_TX); */
+
+	return ret;
+}
+EXPORT_SYMBOL(mnl_ring_build_frame);
+
+/**
+ * mnl_ring_parse_frame2
+ *
+ * advance ring.
+ * Just wrapping mnl_cb_run2 to let users not take care of
+ * struct nl_mmap_hdr
+ */
+int mnl_ring_parse_frame2(struct mnl_ring_socket *nlm, unsigned int seq,
+			  unsigned int portid, mnl_cb_t cb, void *data,
+			  mnl_cb_t *cb_ctl_array, unsigned int cb_ctl_array_len)
+{
+	struct nl_mmap_hdr *hdr;
+	int ret;
+
+	hdr = mnl_ring_poll_rxframe(nlm);
+	if (hdr == NULL)
+		return MNL_CB_ERROR;
+
+	ret = mnl_cb_run2(MNL_MMAP_MSGHDR(hdr), hdr->nm_len, seq, portid,
+			  cb, data, cb_ctl_array, cb_ctl_array_len);
+	hdr->nm_status = NL_MMAP_STATUS_UNUSED;
+	mnl_ring_advance(nlm, MNL_RING_RX);
+
+	return ret;
+}
+EXPORT_SYMBOL(mnl_ring_parse_frame2);
+
+/**
+ * mnl_ring_parse_frame
+ */
+int mnl_ring_parse_frame(struct mnl_ring_socket *nlm, unsigned int seq, unsigned int portid,
+			  mnl_cb_t cb, void *data)
+{
+	return mnl_ring_parse_frame2(nlm, seq, portid, cb, data, NULL, 0);
+}
+EXPORT_SYMBOL(mnl_ring_parse_frame);