22 /* tunnel.c: an IP tunnel driver
24 	The purpose of this driver is to provide an IP tunnel through
25 	which you can tunnel network traffic transparently across subnets.
36 		Made the tunnels use dev->name not tunnel: when error reporting.
42 		Changed to tunnel to destination gateway in addition to the
43 			tunnel's pointopoint address
51 /* Things I wish I had known when writing the tunnel driver:
55 	contains the tunnel device that _we_ are.
201 	/* no tunnel info required for ipip. */
207 	/* no tunnel info required for mplsip. */
217 	struct ip_tunnel *tunnel;  in ipip_tunnel_rcv()  local
221 	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,  in ipip_tunnel_rcv()
223 	if (tunnel) {  in ipip_tunnel_rcv()
226 		if (tunnel->parms.iph.protocol != ipproto &&  in ipip_tunnel_rcv()
227 		    tunnel->parms.iph.protocol != 0)  in ipip_tunnel_rcv()
240 		if (tunnel->collect_md) {  in ipip_tunnel_rcv()
247 		return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in ipip_tunnel_rcv()
276 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_xmit()  local
277 	const struct iphdr  *tiph = &tunnel->parms.iph;  in ipip_tunnel_xmit()
304 	if (tunnel->collect_md)  in ipip_tunnel_xmit()
381 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_init()  local
383 	__dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);  in ipip_tunnel_init()
384 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);  in ipip_tunnel_init()
386 	tunnel->tun_hlen = 0;  in ipip_tunnel_init()
387 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in ipip_tunnel_init()
511 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_fill_info()  local
512 	struct ip_tunnel_parm *parm = &tunnel->parms;  in ipip_fill_info()
522 	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))  in ipip_fill_info()
526 			tunnel->encap.type) ||  in ipip_fill_info()
528 			 tunnel->encap.sport) ||  in ipip_fill_info()
530 			 tunnel->encap.dport) ||  in ipip_fill_info()
532 			tunnel->encap.flags))  in ipip_fill_info()
535 	if (tunnel->collect_md)  in ipip_fill_info()
617 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
623 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
650 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()
653 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()