75    - traceroute does not work. I planned to relay ICMP from tunnel,
93    (branches, that exceed pmtu are pruned) and tunnel mtu
269 	struct ip_tunnel *tunnel;  in erspan_rcv()  local
279 		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,  in erspan_rcv()
285 		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,  in erspan_rcv()
290 	if (tunnel) {  in erspan_rcv()
305 		if (tunnel->collect_md) {  in erspan_rcv()
341 		ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in erspan_rcv()
356 	struct ip_tunnel *tunnel;  in __ipgre_rcv()  local
359 	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,  in __ipgre_rcv()
362 	if (tunnel) {  in __ipgre_rcv()
372 		if (tunnel->dev->header_ops == &ipgre_header_ops)  in __ipgre_rcv()
377 		tnl_params = &tunnel->parms.iph;  in __ipgre_rcv()
378 		if (tunnel->collect_md || tnl_params->daddr == 0) {  in __ipgre_rcv()
389 		ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in __ipgre_rcv()
461 	struct ip_tunnel *tunnel = netdev_priv(dev);  in __gre_xmit()  local
462 	__be16 flags = tunnel->parms.o_flags;  in __gre_xmit()
465 	gre_build_header(skb, tunnel->tun_hlen,  in __gre_xmit()
466 			 flags, proto, tunnel->parms.o_key,  in __gre_xmit()
467 			 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0);  in __gre_xmit()
480 	struct ip_tunnel *tunnel = netdev_priv(dev);  in gre_fb_xmit()  local
497 	/* Push Tunnel header. */  in gre_fb_xmit()
505 			 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) : 0);  in gre_fb_xmit()
518 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_fb_xmit()  local
587 			 proto, 0, htonl(atomic_fetch_inc(&tunnel->o_seqno)));  in erspan_fb_xmit()
625 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_xmit()  local
631 	if (tunnel->collect_md) {  in ipgre_xmit()
645 		skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));  in ipgre_xmit()
655 		tnl_params = &tunnel->parms.iph;  in ipgre_xmit()
658 	if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))  in ipgre_xmit()
673 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_xmit()  local
680 	if (tunnel->collect_md) {  in erspan_xmit()
697 	if (tunnel->erspan_ver == 0) {  in erspan_xmit()
699 		tunnel->parms.o_flags &= ~TUNNEL_SEQ;  in erspan_xmit()
700 	} else if (tunnel->erspan_ver == 1) {  in erspan_xmit()
701 		erspan_build_header(skb, ntohl(tunnel->parms.o_key),  in erspan_xmit()
702 				    tunnel->index,  in erspan_xmit()
705 	} else if (tunnel->erspan_ver == 2) {  in erspan_xmit()
706 		erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),  in erspan_xmit()
707 				       tunnel->dir, tunnel->hwid,  in erspan_xmit()
714 	tunnel->parms.o_flags &= ~TUNNEL_KEY;  in erspan_xmit()
715 	__gre_xmit(skb, dev, &tunnel->parms.iph, proto);  in erspan_xmit()
727 	struct ip_tunnel *tunnel = netdev_priv(dev);  in gre_tap_xmit()  local
732 	if (tunnel->collect_md) {  in gre_tap_xmit()
737 	if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))  in gre_tap_xmit()
743 	__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));  in gre_tap_xmit()
754 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_link_update()  local
758 	len = tunnel->tun_hlen;  in ipgre_link_update()
759 	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);  in ipgre_link_update()
760 	len = tunnel->tun_hlen - len;  in ipgre_link_update()
761 	tunnel->hlen = tunnel->hlen + len;  in ipgre_link_update()
771 	flags = tunnel->parms.o_flags;  in ipgre_link_update()
774 	    (flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE)) {  in ipgre_link_update()
834    ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
952 	struct ip_tunnel *tunnel;  in __gre_tunnel_init()  local
955 	tunnel = netdev_priv(dev);  in __gre_tunnel_init()
956 	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);  in __gre_tunnel_init()
957 	tunnel->parms.iph.protocol = IPPROTO_GRE;  in __gre_tunnel_init()
959 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in __gre_tunnel_init()
960 	dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);  in __gre_tunnel_init()
965 	flags = tunnel->parms.o_flags;  in __gre_tunnel_init()
972 	if (flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE)  in __gre_tunnel_init()
981 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_tunnel_init()  local
982 	struct iphdr *iph = &tunnel->parms.iph;  in ipgre_tunnel_init()
993 	if (iph->daddr && !tunnel->collect_md) {  in ipgre_tunnel_init()
1000 			dev->hard_header_len = tunnel->hlen + sizeof(*iph);  in ipgre_tunnel_init()
1004 	} else if (!tunnel->collect_md) {  in ipgre_tunnel_init()
1006 		dev->hard_header_len = tunnel->hlen + sizeof(*iph);  in ipgre_tunnel_init()
1292 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_tunnel_init()  local
1294 	if (tunnel->erspan_ver == 0)  in erspan_tunnel_init()
1295 		tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */  in erspan_tunnel_init()
1297 		tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */  in erspan_tunnel_init()
1299 	tunnel->parms.iph.protocol = IPPROTO_GRE;  in erspan_tunnel_init()
1300 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +  in erspan_tunnel_init()
1301 		       erspan_hdr_len(tunnel->erspan_ver);  in erspan_tunnel_init()