fix(udp): retry send on first EINVAL

mxinden · Dec 12, 2024 · 7ed29ac · 7ed29ac
1 parent fdc001e
commit 7ed29ac
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/quinn-udp/src/unix.rs b/quinn-udp/src/unix.rs
@@ -332,8 +332,20 @@ fn send(
 
                     if e.raw_os_error() == Some(libc::EINVAL) {
                         // Some arguments to `sendmsg` are not supported.
-                        // Switch to fallback mode.
-                        state.set_sendmsg_einval();
+                        if !state.sendmsg_einval() {
+                            // Switch to fallback mode.
+                            state.set_sendmsg_einval();
+                            prepare_msg(
+                                transmit,
+                                &dst_addr,
+                                &mut msg_hdr,
+                                &mut iovec,
+                                &mut cmsgs,
+                                encode_src_ip,
+                                state.sendmsg_einval(),
+                            );
+                            continue;
+                        }
                     }
 
                     // - EMSGSIZE is expected for MTU probes. Future work might be able to avoid