DCCP_OPT_CONFIRM_L
if (opt == DCCP_OPT_CONFIRM_L && val_len) {
dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_CC);
dccp_add_feature_option(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_CC , val, 1);
} else if (opt == DCCP_OPT_CONFIRM_L) {
dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR);
dccp_add_feature_option(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR , val, 1);
} else if (opt == DCCP_OPT_CONFIRM_L) {
dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR);
dccp_add_option(dp, DCCP_OPT_CONFIRM_L, NULL, 0);