75    - traceroute does not work. I planned to relay ICMP from tunnel,
93    (branches, that exceed pmtu are pruned) and tunnel mtu
267 	struct ip_tunnel *tunnel;  in erspan_rcv()  local
277 		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,  in erspan_rcv()
283 		tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,  in erspan_rcv()
288 	if (tunnel) {  in erspan_rcv()
303 		if (tunnel->collect_md) {  in erspan_rcv()
339 		ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in erspan_rcv()
354 	struct ip_tunnel *tunnel;  in __ipgre_rcv()  local
357 	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,  in __ipgre_rcv()
360 	if (tunnel) {  in __ipgre_rcv()
367 		if (tunnel->dev->type != ARPHRD_NONE)  in __ipgre_rcv()
372 		tnl_params = &tunnel->parms.iph;  in __ipgre_rcv()
373 		if (tunnel->collect_md || tnl_params->daddr == 0) {  in __ipgre_rcv()
384 		ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in __ipgre_rcv()
456 	struct ip_tunnel *tunnel = netdev_priv(dev);  in __gre_xmit()  local
458 	if (tunnel->parms.o_flags & TUNNEL_SEQ)  in __gre_xmit()
459 		tunnel->o_seqno++;  in __gre_xmit()
462 	gre_build_header(skb, tunnel->tun_hlen,  in __gre_xmit()
463 			 tunnel->parms.o_flags, proto, tunnel->parms.o_key,  in __gre_xmit()
464 			 htonl(tunnel->o_seqno));  in __gre_xmit()
477 	struct ip_tunnel *tunnel = netdev_priv(dev);  in gre_fb_xmit()  local
494 	/* Push Tunnel header. */  in gre_fb_xmit()
502 			 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);  in gre_fb_xmit()
515 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_fb_xmit()  local
579 			 proto, 0, htonl(tunnel->o_seqno++));  in erspan_fb_xmit()
617 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_xmit()  local
623 	if (tunnel->collect_md) {  in ipgre_xmit()
629 		const int pull_len = tunnel->hlen + sizeof(struct iphdr);  in ipgre_xmit()
648 		tnl_params = &tunnel->parms.iph;  in ipgre_xmit()
651 	if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))  in ipgre_xmit()
666 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_xmit()  local
673 	if (tunnel->collect_md) {  in erspan_xmit()
690 	if (tunnel->erspan_ver == 0) {  in erspan_xmit()
692 		tunnel->parms.o_flags &= ~TUNNEL_SEQ;  in erspan_xmit()
693 	} else if (tunnel->erspan_ver == 1) {  in erspan_xmit()
694 		erspan_build_header(skb, ntohl(tunnel->parms.o_key),  in erspan_xmit()
695 				    tunnel->index,  in erspan_xmit()
698 	} else if (tunnel->erspan_ver == 2) {  in erspan_xmit()
699 		erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),  in erspan_xmit()
700 				       tunnel->dir, tunnel->hwid,  in erspan_xmit()
707 	tunnel->parms.o_flags &= ~TUNNEL_KEY;  in erspan_xmit()
708 	__gre_xmit(skb, dev, &tunnel->parms.iph, proto);  in erspan_xmit()
720 	struct ip_tunnel *tunnel = netdev_priv(dev);  in gre_tap_xmit()  local
725 	if (tunnel->collect_md) {  in gre_tap_xmit()
730 	if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))  in gre_tap_xmit()
736 	__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));  in gre_tap_xmit()
747 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_link_update()  local
750 	len = tunnel->tun_hlen;  in ipgre_link_update()
751 	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);  in ipgre_link_update()
752 	len = tunnel->tun_hlen - len;  in ipgre_link_update()
753 	tunnel->hlen = tunnel->hlen + len;  in ipgre_link_update()
763 	if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {  in ipgre_link_update()
764 		if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||  in ipgre_link_update()
765 		    tunnel->encap.type == TUNNEL_ENCAP_NONE) {  in ipgre_link_update()
830    ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
948 	struct ip_tunnel *tunnel;  in __gre_tunnel_init()  local
950 	tunnel = netdev_priv(dev);  in __gre_tunnel_init()
951 	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);  in __gre_tunnel_init()
952 	tunnel->parms.iph.protocol = IPPROTO_GRE;  in __gre_tunnel_init()
954 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in __gre_tunnel_init()
955 	dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);  in __gre_tunnel_init()
960 	if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {  in __gre_tunnel_init()
965 		if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||  in __gre_tunnel_init()
966 		    (tunnel->encap.type == TUNNEL_ENCAP_NONE)) {  in __gre_tunnel_init()
980 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipgre_tunnel_init()  local
981 	struct iphdr *iph = &tunnel->parms.iph;  in ipgre_tunnel_init()
992 	if (iph->daddr && !tunnel->collect_md) {  in ipgre_tunnel_init()
999 			dev->hard_header_len = tunnel->hlen + sizeof(*iph);  in ipgre_tunnel_init()
1003 	} else if (!tunnel->collect_md) {  in ipgre_tunnel_init()
1005 		dev->hard_header_len = tunnel->hlen + sizeof(*iph);  in ipgre_tunnel_init()
1291 	struct ip_tunnel *tunnel = netdev_priv(dev);  in erspan_tunnel_init()  local
1293 	if (tunnel->erspan_ver == 0)  in erspan_tunnel_init()
1294 		tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */  in erspan_tunnel_init()
1296 		tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */  in erspan_tunnel_init()
1298 	tunnel->parms.iph.protocol = IPPROTO_GRE;  in erspan_tunnel_init()
1299 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +  in erspan_tunnel_init()
1300 		       erspan_hdr_len(tunnel->erspan_ver);  in erspan_tunnel_init()