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.
204 	/* no tunnel info required for ipip. */
210 	/* no tunnel info required for mplsip. */
221 	struct ip_tunnel *tunnel;  in ipip_tunnel_rcv()  local
227 	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, iph->saddr,  in ipip_tunnel_rcv()
229 	if (tunnel) {  in ipip_tunnel_rcv()
232 		if (tunnel->parms.iph.protocol != ipproto &&  in ipip_tunnel_rcv()
233 		    tunnel->parms.iph.protocol != 0)  in ipip_tunnel_rcv()
246 		if (tunnel->collect_md) {  in ipip_tunnel_rcv()
256 		return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in ipip_tunnel_rcv()
285 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_xmit()  local
286 	const struct iphdr  *tiph = &tunnel->parms.iph;  in ipip_tunnel_xmit()
313 	if (tunnel->collect_md)  in ipip_tunnel_xmit()
391 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_init()  local
393 	__dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);  in ipip_tunnel_init()
394 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);  in ipip_tunnel_init()
396 	tunnel->tun_hlen = 0;  in ipip_tunnel_init()
397 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in ipip_tunnel_init()
521 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_fill_info()  local
522 	struct ip_tunnel_parm_kern *parm = &tunnel->parms;  in ipip_fill_info()
532 	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))  in ipip_fill_info()
536 			tunnel->encap.type) ||  in ipip_fill_info()
538 			 tunnel->encap.sport) ||  in ipip_fill_info()
540 			 tunnel->encap.dport) ||  in ipip_fill_info()
542 			tunnel->encap.flags))  in ipip_fill_info()
545 	if (tunnel->collect_md)  in ipip_fill_info()
629 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
635 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
662 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()
665 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()