Fix DSCP tagging for dual-stack sockets on Linux

2024-02-03 16:06:31 -06:00
parent b7a3985807
commit be6f856840
1 changed files with 4 additions and 1 deletions
--- a/src/platform/linux/misc.cpp
+++ b/src/platform/linux/misc.cpp
@@ -628,7 +628,10 @@ namespace platf {
    if (dscp_tagging) {
      int level;
      int option;
-      if (address.is_v6()) {
+
+      // With dual-stack sockets, Linux uses IPV6_TCLASS for IPv6 traffic
+      // and IP_TOS for IPv4 traffic.
+      if (address.is_v6() && !address.to_v6().is_v4_mapped()) {
        level = SOL_IPV6;
        option = IPV6_TCLASS;
      }