DST_FEATURE_ECN_CA
#define DST_FEATURE_MASK (DST_FEATURE_ECN_CA)
#define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN)
fi_val &= ~DST_FEATURE_ECN_CA;
metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
(ecn_ok_dst & DST_FEATURE_ECN_CA) ||