Merge branch 'tnl-ipv4-ipv6'

Jiri Benc says:

====================
tunnels: fix incorrect IPv4/v6 headers interpretation

With tunneling, it is currently possible to get an IPv6 header and interpret
it as an IPv4 header, or to interpret an IPv6 address as an IPv4 address
(and vice versa). This leads to things like sending packets to incorrect
address, IPv6 flow label being interpreted as IP packet length, etc.

Fix several places where this can happen.

Most of this is net-next only. The third patch affects net, too, but it
doesn't seem there's anything in user space that sets the attribute at all
currently, thus net-next is fine.

Changelog:
v2: fixed geneve after incorrect rebase on top of Pravin's patches
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

9 files changed, 21 insertions, 5 deletions

diff --git a/net/core/filter.c b/net/core/filter.c
index 66500d490995..13079f03902e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1493,6 +1493,8 @@ static u64 bpf_skb_get_tunnel_key(u64 r1, u64 r2, u64 size, u64 flags, u64 r5)
 
 	if (unlikely(size != sizeof(struct bpf_tunnel_key) || flags || !info))
 		return -EINVAL;
+	if (ip_tunnel_info_af(info) != AF_INET)
+		return -EINVAL;
 
 	to->tunnel_id = be64_to_cpu(info->key.tun_id);
 	to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index 2d1646cff057..e0fcbbbcfe54 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -566,7 +566,7 @@ static int parse_nl_config(struct genl_info *info,
 	if (info->attrs[FOU_ATTR_AF]) {
 		u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]);
 
-		if (family != AF_INET && family != AF_INET6)
+		if (family != AF_INET)
 			return -EINVAL;
 
 		cfg->udp_config.family = family;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index faf1cde6f8da..bd0679d90519 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -511,7 +511,8 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
 	int err;
 
 	tun_info = skb_tunnel_info(skb);
-	if (unlikely(!tun_info || tun_info->mode != IP_TUNNEL_INFO_TX))
+	if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
+		     ip_tunnel_info_af(tun_info) != AF_INET))
 		goto err_free_skb;
 
 	key = &tun_info->key;
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 934f2ac8ad61..0c756ade1cf7 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -356,7 +356,7 @@ static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr,
 	if (tb[LWTUNNEL_IP6_FLAGS])
 		tun_info->key.tun_flags = nla_get_u16(tb[LWTUNNEL_IP6_FLAGS]);
 
-	tun_info->mode = IP_TUNNEL_INFO_TX;
+	tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
 	tun_info->options = NULL;
 	tun_info->options_len = 0;
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6b91879e9cbe..5f4a5565ad8b 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1696,7 +1696,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	 */
 
 	tun_info = skb_tunnel_info(skb);
-	if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
+	if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
 		fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id;
 	else
 		fl4.flowi4_tun_key.tun_id = 0;
diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
index e1a1136bda7c..14dacf1df529 100644
--- a/net/ipv6/ip6_udp_tunnel.c
+++ b/net/ipv6/ip6_udp_tunnel.c
@@ -23,6 +23,15 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
 	if (err < 0)
 		goto error;
 
+	if (cfg->ipv6_v6only) {
+		int val = 1;
+
+		err = kernel_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
+					(char *) &val, sizeof(val));
+		if (err < 0)
+			goto error;
+	}
+
 	udp6_addr.sin6_family = AF_INET6;
 	memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
 	       sizeof(udp6_addr.sin6_addr));
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index df3e353a012d..308dd5f9158f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1174,7 +1174,7 @@ void ip6_route_input(struct sk_buff *skb)
 	};
 
 	tun_info = skb_tunnel_info(skb);
-	if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
+	if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
 		fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
 	skb_dst_drop(skb);
 	skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 5a3195e538ce..9760dc43bdb9 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -688,6 +688,8 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 {
 	/* Extract metadata from packet. */
 	if (tun_info) {
+		if (ip_tunnel_info_af(tun_info) != AF_INET)
+			return -EINVAL;
 		memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
 
 		if (tun_info->options) {
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index e2dc9dac59e6..40164037928e 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -587,6 +587,8 @@ int ovs_tunnel_get_egress_info(struct ip_tunnel_info *egress_tun_info,
 
 	if (unlikely(!tun_info))
 		return -EINVAL;
+	if (ip_tunnel_info_af(tun_info) != AF_INET)
+		return -EINVAL;
 
 	tun_key = &tun_info->key;