ETH_P_CAN
skb->protocol = htons(ETH_P_CAN);
case ETH_P_CAN:
(skb->protocol != htons(ETH_P_CAN) &&
skb->protocol = htons(ETH_P_CAN);
skb->protocol = htons(ETH_P_CAN);
.type = cpu_to_be16(ETH_P_CAN),