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()
248 		return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);  in ipip_tunnel_rcv()
277 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_xmit()  local
278 	const struct iphdr  *tiph = &tunnel->parms.iph;  in ipip_tunnel_xmit()
305 	if (tunnel->collect_md)  in ipip_tunnel_xmit()
382 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_tunnel_init()  local
384 	__dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);  in ipip_tunnel_init()
385 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);  in ipip_tunnel_init()
387 	tunnel->tun_hlen = 0;  in ipip_tunnel_init()
388 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;  in ipip_tunnel_init()
512 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip_fill_info()  local
513 	struct ip_tunnel_parm *parm = &tunnel->parms;  in ipip_fill_info()
523 	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))  in ipip_fill_info()
527 			tunnel->encap.type) ||  in ipip_fill_info()
529 			 tunnel->encap.sport) ||  in ipip_fill_info()
531 			 tunnel->encap.dport) ||  in ipip_fill_info()
533 			tunnel->encap.flags))  in ipip_fill_info()
536 	if (tunnel->collect_md)  in ipip_fill_info()
618 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
624 		pr_info("%s: can't register tunnel\n", __func__);  in ipip_init()
651 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()
654 		pr_info("%s: can't deregister tunnel\n", __func__);  in ipip_fini()