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()
245 		return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in ipip_tunnel_rcv()
274 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_xmit()  local
275 	const struct iphdr  *tiph = &tunnel->parms.iph;  in ipip_tunnel_xmit()
302 	if (tunnel->collect_md)  in ipip_tunnel_xmit()
379 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_init()  local
381 	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);  in ipip_tunnel_init()
382 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);  in ipip_tunnel_init()
384 	tunnel->tun_hlen = 0;  in ipip_tunnel_init()
385 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in ipip_tunnel_init()
565 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_fill_info()  local
566 	struct ip_tunnel_parm *parm = &tunnel->parms;  in ipip_fill_info()
576 	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))  in ipip_fill_info()
580 			tunnel->encap.type) ||  in ipip_fill_info()
582 			 tunnel->encap.sport) ||  in ipip_fill_info()
584 			 tunnel->encap.dport) ||  in ipip_fill_info()
586 			tunnel->encap.flags))  in ipip_fill_info()
589 	if (tunnel->collect_md)  in ipip_fill_info()
671 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
677 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
704 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()
707 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()