From 23af52a05391e8083e7211358021bac94e5e0103 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Mon, 23 Sep 2019 21:15:31 +0200
Subject: [PATCH] Add missing parts of meshlink_set_node_pmtu_cb().

---
 src/meshlink++.h | 25 +++++++++++++++++++++++++
 src/meshlink.c   | 11 +++++++++++
 src/meshlink.sym |  1 +
 3 files changed, 37 insertions(+)

diff --git a/src/meshlink++.h b/src/meshlink++.h
index 5550a9e3..6b9c6855 100644
--- a/src/meshlink++.h
+++ b/src/meshlink++.h
@@ -57,6 +57,14 @@ typedef void (*connection_try_cb_t)(mesh *mesh, node *node);
  */
 typedef void (*node_status_cb_t)(mesh *mesh, node *node, bool reachable);
 
+/// A callback reporting node path MTU changes.
+/** @param mesh       A handle which represents an instance of MeshLink.
+ *  @param node       A pointer to a meshlink_node_t describing the node whose status changed.
+ *                    This pointer is valid until meshlink_close() is called.
+ *  @param pmtu       The current path MTU to the node, or 0 if UDP communication is not (yet) possible.
+ */
+typedef void (*node_pmtu_cb_t)(mesh *mesh, node *node, uint16_t pmtu);
+
 /// A callback reporting duplicate node detection.
 /** @param mesh       A handle which represents an instance of MeshLink.
  *  @param node       A pointer to a meshlink_node_t describing the node which is duplicate.
@@ -231,6 +239,13 @@ public:
 		(void)reachable;
 	}
 
+	/// This functions is called whenever another node's path MTU changes.
+	virtual void node_pmtu(node *peer, uint16_t pmtu) {
+		/* do nothing */
+		(void)peer;
+		(void)pmtu;
+	}
+
 	/// This functions is called whenever a duplicate node is detected.
 	virtual void node_duplicate(node *peer) {
 		/* do nothing */
@@ -321,6 +336,7 @@ public:
 	bool start() {
 		meshlink_set_receive_cb(handle, &receive_trampoline);
 		meshlink_set_node_status_cb(handle, &node_status_trampoline);
+		meshlink_set_node_pmtu_cb(handle, &node_pmtu_trampoline);
 		meshlink_set_node_duplicate_cb(handle, &node_duplicate_trampoline);
 		meshlink_set_log_cb(handle, MESHLINK_DEBUG, &log_trampoline);
 		meshlink_set_channel_accept_cb(handle, &channel_accept_trampoline);
@@ -905,6 +921,15 @@ private:
 		that->node_status(static_cast<node *>(peer), reachable);
 	}
 
+	static void node_pmtu_trampoline(meshlink_handle_t *handle, meshlink_node_t *peer, uint16_t pmtu) {
+		if(!(handle->priv)) {
+			return;
+		}
+
+		meshlink::mesh *that = static_cast<mesh *>(handle->priv);
+		that->node_pmtu(static_cast<node *>(peer), pmtu);
+	}
+
 	static void node_duplicate_trampoline(meshlink_handle_t *handle, meshlink_node_t *peer) {
 		if(!(handle->priv)) {
 			return;
diff --git a/src/meshlink.c b/src/meshlink.c
index d619f544..bb77ccf8 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -1672,6 +1672,17 @@ void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_c
 	pthread_mutex_unlock(&(mesh->mesh_mutex));
 }
 
+void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
+	if(!mesh) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
+	pthread_mutex_lock(&(mesh->mesh_mutex));
+	mesh->node_pmtu_cb = cb;
+	pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
 	if(!mesh) {
 		meshlink_errno = MESHLINK_EINVAL;
diff --git a/src/meshlink.sym b/src/meshlink.sym
index 784ff5c4..207da7c4 100644
--- a/src/meshlink.sym
+++ b/src/meshlink.sym
@@ -66,6 +66,7 @@ meshlink_set_dev_class_timeouts
 meshlink_set_invitation_timeout
 meshlink_set_log_cb
 meshlink_set_node_duplicate_cb
+meshlink_set_node_pmtu_cb
 meshlink_set_node_status_cb
 meshlink_set_port
 meshlink_set_receive_cb
-- 
2.39.2