net/ipv4/ip_tunnel.c

292 		struct rtable *rt;
298 		rt = ip_route_output_key(tunnel->net, &fl4);
300 		if (!IS_ERR(rt)) {
301 			tdev = rt->dst.dev;
302 			ip_rt_put(rt);
511 			    struct rtable *rt, __be16 df,
524 		mtu = dst_mtu(&rt->dst) - (sizeof(struct iphdr) + tunnel_hlen);
591 	struct rtable *rt = NULL;
624 		rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr);
625 	if (!rt) {
626 		rt = ip_route_output_key(tunnel->net, &fl4);
627 		if (IS_ERR(rt)) {
632 			dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
635 	if (rt->dst.dev == dev) {
636 		ip_rt_put(rt);
643 	if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen,
645 		ip_rt_put(rt);
657 			ttl = ip4_dst_hoplimit(&rt->dst);
660 	headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
662 		ip_rt_put(rt);
668 	iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl,
688 	struct rtable *rt = NULL;		/* Route to the other host */
721 			rt = skb_rtable(skb);
722 			dst = rt_nexthop(rt, inner_iph->daddr);
785 			rt = dst_cache_get_ip4(&tun_info->dst_cache,
788 		rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache,
792 	if (!rt) {
793 		rt = ip_route_output_key(tunnel->net, &fl4);
795 		if (IS_ERR(rt)) {
800 			dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
803 			dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
807 	if (rt->dst.dev == dev) {
808 		ip_rt_put(rt);
817 	if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, 0, 0, false)) {
818 		ip_rt_put(rt);
842 			ttl = ip4_dst_hoplimit(&rt->dst);
845 	max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
846 			+ rt->dst.header_len + ip_encap_hlen(&tunnel->encap);
849 		ip_rt_put(rt);
857 	iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,