XT_DSCP_MASK 15 include/linux/netfilter_ipv4/ipt_dscp.h #define IPT_DSCP_MASK XT_DSCP_MASK XT_DSCP_MASK 41 net/netfilter/xt_DSCP.c ipv4_change_dsfield(ip_hdr(skb), (__u8)(~XT_DSCP_MASK), XT_DSCP_MASK 58 net/netfilter/xt_DSCP.c ipv6_change_dsfield(ipv6_hdr(skb), (__u8)(~XT_DSCP_MASK),