126     struct ethhdr* eth = is_ethernet ? data : NULL;  // used iff is_ethernet  local
127     struct ipv6hdr* ip6 = is_ethernet ? (void*)(eth + 1) : data;
133     if (is_ethernet && (eth->h_proto != htons(ETH_P_IPV6))) return TC_ACT_OK;
179     if (is_ethernet) __builtin_memcpy(downstream ? kd.dstMac : ku.dstMac, eth->h_dest, ETH_ALEN);
239         eth = data;
240         ip6 = (void*)(eth + 1);
269     *eth = v->macHeader;
373     struct ethhdr* eth = is_ethernet ? data : NULL;  // used iff is_ethernet  in do_forward4()  local
374     struct iphdr* ip = is_ethernet ? (void*)(eth + 1) : data;  in do_forward4()
380     if (is_ethernet && (eth->h_proto != htons(ETH_P_IP))) return TC_ACT_OK;  in do_forward4()
492     if (is_ethernet) __builtin_memcpy(k.dstMac, eth->h_dest, ETH_ALEN);  in do_forward4()
552         eth = data;  in do_forward4()
553         ip = (void*)(eth + 1);  in do_forward4()
570     *eth = v->macHeader;  in do_forward4()
792     const struct ethhdr* eth = data;  in do_xdp_forward_ether()  local
795     if ((void*)(eth + 1) > data_end) return XDP_PASS;  in do_xdp_forward_ether()
797     if (eth->h_proto == htons(ETH_P_IPV6))  in do_xdp_forward_ether()
799     if (eth->h_proto == htons(ETH_P_IP))  in do_xdp_forward_ether()