skb = dev_alloc_skb( dlen + 2 );
skb_reserve(skb,2);
memcpy(skb_put(skb, dlen), pdcp_sdu,dlen);

skb->dev = nasdev[inst];
skb_reset_mac_header(skb);

skb->pkt_type = PACKET_HOST;
skb->ip_summed = CHECKSUM_NONE;
...

skb_reset_network_header(skb);
network_header = (struct iphdr *)skb_network_header(skb);
protocol = network_header->protocol;
skb->protocol = htons(ETH_P_IP);

netif_rx(skb); // I need to send the packet instead of receiving it.