net: check tunnel option type in tunnel flags

Check the tunnel option type stored in tunnel flags when creating options
for tunnels. Thereby ensuring we do not set geneve, vxlan or erspan tunnel
options on interfaces that are not associated with them.

Make sure all users of the infrastructure set correct flags, for the BPF
helper we have to set all bits to keep backward compatibility.

Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 23 insertions, 7 deletions

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 3e94375b9b01..471edd76ff55 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -236,7 +236,8 @@ static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 		}
 		/* Update tunnel dst according to Geneve options. */
 		ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
-					gnvh->options, gnvh->opt_len * 4);
+					gnvh->options, gnvh->opt_len * 4,
+					TUNNEL_GENEVE_OPT);
 	} else {
 		/* Drop packets w/ critical options,
 		 * since we don't support any...
@@ -675,7 +676,8 @@ static void geneve_build_header(struct genevehdr *geneveh,
 	geneveh->proto_type = htons(ETH_P_TEB);
 	geneveh->rsvd2 = 0;
 
-	ip_tunnel_info_opts_get(geneveh->options, info);
+	if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
+		ip_tunnel_info_opts_get(geneveh->options, info);
 }
 
 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index cc14e0cd5647..7eb30d7c8bd7 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2122,7 +2122,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		vni = tunnel_id_to_key32(info->key.tun_id);
 		ifindex = 0;
 		dst_cache = &info->dst_cache;
-		if (info->options_len)
+		if (info->options_len &&
+		    info->key.tun_flags & TUNNEL_VXLAN_OPT)
 			md = ip_tunnel_info_opts(info);
 		ttl = info->key.ttl;
 		tos = info->key.tos;
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 90ff430f5e9d..b0d022ff6ea1 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -466,10 +466,12 @@ static inline void ip_tunnel_info_opts_get(void *to,
 }
 
 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
-					   const void *from, int len)
+					   const void *from, int len,
+					   __be16 flags)
 {
 	memcpy(ip_tunnel_info_opts(info), from, len);
 	info->options_len = len;
+	info->key.tun_flags |= flags;
 }
 
 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
@@ -511,9 +513,11 @@ static inline void ip_tunnel_info_opts_get(void *to,
 }
 
 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
-					   const void *from, int len)
+					   const void *from, int len,
+					   __be16 flags)
 {
 	info->options_len = 0;
+	info->key.tun_flags |= flags;
 }
 
 #endif /* CONFIG_INET */
diff --git a/net/core/filter.c b/net/core/filter.c
index e7f12e9f598c..dade922678f6 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3582,7 +3582,7 @@ BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
 	if (unlikely(size > IP_TUNNEL_OPTS_MAX))
 		return -ENOMEM;
 
-	ip_tunnel_info_opts_set(info, from, size);
+	ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
 
 	return 0;
 }
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 2d8efeecf619..c8ca5d8f0f75 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -587,6 +587,8 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev,
 		goto err_free_skb;
 
 	key = &tun_info->key;
+	if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
+		goto err_free_rt;
 	md = ip_tunnel_info_opts(tun_info);
 	if (!md)
 		goto err_free_rt;
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index c8cf2fdbb13b..367177786e34 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -990,6 +990,8 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 		fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 
 		dsfield = key->tos;
+		if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
+			goto tx_err;
 		md = ip_tunnel_info_opts(tun_info);
 		if (!md)
 			goto tx_err;
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 492ab0c36f7c..391c4073a6dc 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -2516,7 +2516,9 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
 	struct ovs_tunnel_info *ovs_tun;
 	struct nlattr *a;
 	int err = 0, start, opts_type;
+	__be16 dst_opt_type;
 
+	dst_opt_type = 0;
 	ovs_match_init(&match, &key, true, NULL);
 	opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
 	if (opts_type < 0)
@@ -2528,10 +2530,13 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
 			err = validate_geneve_opts(&key);
 			if (err < 0)
 				return err;
+			dst_opt_type = TUNNEL_GENEVE_OPT;
 			break;
 		case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
+			dst_opt_type = TUNNEL_VXLAN_OPT;
 			break;
 		case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
+			dst_opt_type = TUNNEL_ERSPAN_OPT;
 			break;
 		}
 	}
@@ -2574,7 +2579,7 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
 	 */
 	ip_tunnel_info_opts_set(tun_info,
 				TUN_METADATA_OPTS(&key, key.tun_opts_len),
-				key.tun_opts_len);
+				key.tun_opts_len, dst_opt_type);
 	add_nested_action_end(*sfa, start);
 
 	return err;