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new 2eaeeaaa015 net/sixlowpan: Bind an unbound UDP socket before sending.
2eaeeaaa015 is described below
commit 2eaeeaaa0155f26f1425f33ce0f000ed8fe2ac15
Author: Max Kriegleder <[email protected]>
AuthorDate: Mon Oct 26 21:36:53 2026 +0100
net/sixlowpan: Bind an unbound UDP socket before sending.
psock_6lowpan_udp_sendto() sent from conn->lport without giving an
unbound socket a local port, as psock_udp_sendto() does through
udp_connect(). udp_poll() serves only connections with a local port,
so sixlowpan_send() waited for a poll that never came and sendto()
never returned.
Select a free port there, as udp_connect() does.
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Max Kriegleder <[email protected]>
---
net/sixlowpan/sixlowpan_udpsend.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/net/sixlowpan/sixlowpan_udpsend.c
b/net/sixlowpan/sixlowpan_udpsend.c
index 80de3071973..389b5b574c5 100644
--- a/net/sixlowpan/sixlowpan_udpsend.c
+++ b/net/sixlowpan/sixlowpan_udpsend.c
@@ -191,6 +191,21 @@ ssize_t psock_6lowpan_udp_sendto(FAR struct socket *psock,
conn = psock->s_conn;
DEBUGASSERT(conn != NULL);
+ /* Bind an unbound socket to a local port, as psock_udp_sendto() does.
+ * udp_poll() serves only connections with a local port, so without one
+ * sixlowpan_send() would wait for a poll that never comes.
+ */
+
+ if (conn->lport == 0)
+ {
+ conn->lport = HTONS(udp_select_port(conn->domain, &conn->u));
+ if (conn->lport == 0)
+ {
+ nerr("ERROR: Failed to get a local port\n");
+ return (ssize_t)-EADDRINUSE;
+ }
+ }
+
/* Route outgoing message to the correct device */
dev = netdev_findby_ripv6addr(conn->u.ipv6.laddr,
