71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
514 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_tunnel_uninit()  local
515 	struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);  in ipip6_tunnel_uninit()
520 		ipip6_tunnel_unlink(sitn, tunnel);  in ipip6_tunnel_uninit()
521 		ipip6_tunnel_del_prl(tunnel, NULL);  in ipip6_tunnel_uninit()
523 	dst_cache_reset(&tunnel->dst_cache);  in ipip6_tunnel_uninit()
605 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,  in is_spoofed_6rd()  argument
609 	if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)  in is_spoofed_6rd()
626 static bool only_dnatted(const struct ip_tunnel *tunnel,  in only_dnatted()  argument
632 	prefix_len = tunnel->ip6rd.prefixlen + 32  in only_dnatted()
633 		- tunnel->ip6rd.relay_prefixlen;  in only_dnatted()
637 	return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);  in only_dnatted()
643 			      struct ip_tunnel *tunnel)  in packet_is_spoofed()  argument
647 	if (tunnel->dev->priv_flags & IFF_ISATAP) {  in packet_is_spoofed()
648 		if (!isatap_chksrc(skb, iph, tunnel))  in packet_is_spoofed()
654 	if (tunnel->dev->flags & IFF_POINTOPOINT)  in packet_is_spoofed()
659 	if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {  in packet_is_spoofed()
666 	if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))  in packet_is_spoofed()
669 	if (only_dnatted(tunnel, &ipv6h->daddr))  in packet_is_spoofed()
681 	struct ip_tunnel *tunnel;  in ipip6_rcv()  local
686 	tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,  in ipip6_rcv()
688 	if (tunnel) {  in ipip6_rcv()
691 		if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&  in ipip6_rcv()
692 		    tunnel->parms.iph.protocol != 0)  in ipip6_rcv()
698 		skb->dev = tunnel->dev;  in ipip6_rcv()
700 		if (packet_is_spoofed(skb, iph, tunnel)) {  in ipip6_rcv()
701 			tunnel->dev->stats.rx_errors++;  in ipip6_rcv()
706 		    !net_eq(tunnel->net, dev_net(tunnel->dev))))  in ipip6_rcv()
721 				++tunnel->dev->stats.rx_frame_errors;  in ipip6_rcv()
722 				++tunnel->dev->stats.rx_errors;  in ipip6_rcv()
727 		tstats = this_cpu_ptr(tunnel->dev->tstats);  in ipip6_rcv()
760 	struct ip_tunnel *tunnel;  in sit_tunnel_rcv()  local
766 	tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,  in sit_tunnel_rcv()
768 	if (tunnel) {  in sit_tunnel_rcv()
771 		if (tunnel->parms.iph.protocol != ipproto &&  in sit_tunnel_rcv()
772 		    tunnel->parms.iph.protocol != 0)  in sit_tunnel_rcv()
787 		return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);  in sit_tunnel_rcv()
813 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,  in check_6rd()  argument
817 	if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,  in check_6rd()
818 			      tunnel->ip6rd.prefixlen)) {  in check_6rd()
823 		pbw0 = tunnel->ip6rd.prefixlen >> 5;  in check_6rd()
824 		pbi0 = tunnel->ip6rd.prefixlen & 0x1f;  in check_6rd()
826 		d = tunnel->ip6rd.relay_prefixlen < 32 ?  in check_6rd()
828 		    tunnel->ip6rd.relay_prefixlen : 0;  in check_6rd()
830 		pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;  in check_6rd()
835 		*v4dst = tunnel->ip6rd.relay_prefix | htonl(d);  in check_6rd()
848 static inline __be32 try_6rd(struct ip_tunnel *tunnel,  in try_6rd()  argument
852 	check_6rd(tunnel, v6dst, &dst);  in try_6rd()
864 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_tunnel_xmit()  local
865 	const struct iphdr  *tiph = &tunnel->parms.iph;  in ipip6_tunnel_xmit()
867 	u8     tos = tunnel->parms.iph.tos;  in ipip6_tunnel_xmit()
879 	int t_hlen = tunnel->hlen + sizeof(struct iphdr);  in ipip6_tunnel_xmit()
912 		dst = try_6rd(tunnel, &iph6->daddr);  in ipip6_tunnel_xmit()
944 	flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,  in ipip6_tunnel_xmit()
947 			   sock_net_uid(tunnel->net, NULL));  in ipip6_tunnel_xmit()
949 	rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr);  in ipip6_tunnel_xmit()
951 		rt = ip_route_output_flow(tunnel->net, &fl4, NULL);  in ipip6_tunnel_xmit()
956 		dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr);  in ipip6_tunnel_xmit()
991 		if (tunnel->parms.iph.daddr)  in ipip6_tunnel_xmit()
1001 	if (tunnel->err_count > 0) {  in ipip6_tunnel_xmit()
1003 				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {  in ipip6_tunnel_xmit()
1004 			tunnel->err_count--;  in ipip6_tunnel_xmit()
1007 			tunnel->err_count = 0;  in ipip6_tunnel_xmit()
1035 	if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {  in ipip6_tunnel_xmit()
1043 		      df, !net_eq(tunnel->net, dev_net(dev)));  in ipip6_tunnel_xmit()
1057 	struct ip_tunnel *tunnel = netdev_priv(dev);  in sit_tunnel_xmit__()  local
1058 	const struct iphdr  *tiph = &tunnel->parms.iph;  in sit_tunnel_xmit__()
1107 	struct ip_tunnel *tunnel;  in ipip6_tunnel_bind_dev()  local
1111 	tunnel = netdev_priv(dev);  in ipip6_tunnel_bind_dev()
1112 	iph = &tunnel->parms.iph;  in ipip6_tunnel_bind_dev()
1115 		struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,  in ipip6_tunnel_bind_dev()
1121 							  tunnel->parms.link);  in ipip6_tunnel_bind_dev()
1130 	if (!tdev && tunnel->parms.link)  in ipip6_tunnel_bind_dev()
1131 		tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);  in ipip6_tunnel_bind_dev()
1134 		int t_hlen = tunnel->hlen + sizeof(struct iphdr);  in ipip6_tunnel_bind_dev()
1412 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_dev_free()  local
1414 	dst_cache_destroy(&tunnel->dst_cache);  in ipip6_dev_free()
1426 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_tunnel_setup()  local
1427 	int t_hlen = tunnel->hlen + sizeof(struct iphdr);  in ipip6_tunnel_setup()
1448 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_tunnel_init()  local
1451 	tunnel->dev = dev;  in ipip6_tunnel_init()
1452 	tunnel->net = dev_net(dev);  in ipip6_tunnel_init()
1453 	strcpy(tunnel->parms.name, dev->name);  in ipip6_tunnel_init()
1460 	err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);  in ipip6_tunnel_init()
1472 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_fb_tunnel_init()  local
1473 	struct iphdr *iph = &tunnel->parms.iph;  in ipip6_fb_tunnel_init()
1482 	rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);  in ipip6_fb_tunnel_init()
1756 	struct ip_tunnel *tunnel = netdev_priv(dev);  in ipip6_fill_info()  local
1757 	struct ip_tunnel_parm *parm = &tunnel->parms;  in ipip6_fill_info()
1768 	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))  in ipip6_fill_info()
1773 			     &tunnel->ip6rd.prefix) ||  in ipip6_fill_info()
1775 			    tunnel->ip6rd.relay_prefix) ||  in ipip6_fill_info()
1777 			tunnel->ip6rd.prefixlen) ||  in ipip6_fill_info()
1779 			tunnel->ip6rd.relay_prefixlen))  in ipip6_fill_info()
1784 			tunnel->encap.type) ||  in ipip6_fill_info()
1786 			tunnel->encap.sport) ||  in ipip6_fill_info()
1788 			tunnel->encap.dport) ||  in ipip6_fill_info()
1790 			tunnel->encap.flags))  in ipip6_fill_info()