76 	// Maximum IPv6 payload length that can be translated to IPv4  in sched_cls_ingress6_nat_6_prog()
108 	// Calculate the IPv4 one's complement checksum of the IPv4 header.  in sched_cls_ingress6_nat_6_prog()
144 	// Copy over the new ipv4 header.  in sched_cls_ingress6_nat_6_prog()
158 	// Must be meta-ethernet IPv4 frame  in sched_cls_egress4_snat4_prog()
162 	// Must have ipv4 header  in sched_cls_egress4_snat4_prog()
166 	// Ethertype - if present - must be IPv4  in sched_cls_egress4_snat4_prog()
174 	// We cannot handle IP options, just standard 20 byte == 5 dword minimal IPv4 header  in sched_cls_egress4_snat4_prog()
178 	// Maximum IPv6 payload length that can be translated to IPv4  in sched_cls_egress4_snat4_prog()
182 	// Calculate the IPv4 one's complement checksum of the IPv4 header.  in sched_cls_egress4_snat4_prog()
195 	// Minimum IPv4 total length is the size of the header  in sched_cls_egress4_snat4_prog()
199 	// We are incapable of dealing with IPv4 fragments  in sched_cls_egress4_snat4_prog()
213 		// If IPv4/UDP checksum is 0 then fallback to clatd so it can calculate the  in sched_cls_egress4_snat4_prog()
259 	// thus we need to subtract out the ipv4 header's sum, and add in the ipv6 header's sum.  in sched_cls_egress4_snat4_prog()
260 	// However, we've already verified the ipv4 checksum is correct and thus 0.  in sched_cls_egress4_snat4_prog()
280 	// Copy over the new ipv4 header.  in sched_cls_egress4_snat4_prog()