1700 	int    encap = 0;  in ipmr_queue_xmit()  local
1724 		encap = sizeof(struct iphdr);  in ipmr_queue_xmit()
1736 	if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {  in ipmr_queue_xmit()
1747 	encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;  in ipmr_queue_xmit()
1749 	if (skb_cow(skb, encap)) {  in ipmr_queue_xmit()
2051 	struct iphdr *encap;  in __pim_rcv()  local
2053 	encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);  in __pim_rcv()
2060 	if (!ipv4_is_multicast(encap->daddr) ||  in __pim_rcv()
2061 	    encap->tot_len == 0 ||  in __pim_rcv()
2062 	    ntohs(encap->tot_len) + pimlen > skb->len)  in __pim_rcv()
2074 	skb_pull(skb, (u8 *)encap - skb->data);  in __pim_rcv()