net: geneve: add missing netlink policy and size for IFLA_GENEVE_INNER_PROTO_INHERIT

Add missing netlink attribute policy and size calculation.
Also enable strict validation from this new attribute onwards.

Fixes: 435fe1c0 ("net: geneve: support IPv4/IPv6 as inner protocol")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Link: https://lore.kernel.org/r/20220322043954.3042468-1-eyal.birger@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/geneve.c

@@ -1262,6 +1262,7 @@ static void geneve_setup(struct net_device *dev)
 }
 
 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
+	[IFLA_GENEVE_UNSPEC]		= { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
 	[IFLA_GENEVE_ID]		= { .type = NLA_U32 },
 	[IFLA_GENEVE_REMOTE]		= { .len = sizeof_field(struct iphdr, daddr) },
 	[IFLA_GENEVE_REMOTE6]		= { .len = sizeof(struct in6_addr) },
@@ -1275,6 +1276,7 @@ static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
 	[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
 	[IFLA_GENEVE_TTL_INHERIT]	= { .type = NLA_U8 },
 	[IFLA_GENEVE_DF]		= { .type = NLA_U8 },
+	[IFLA_GENEVE_INNER_PROTO_INHERIT]	= { .type = NLA_FLAG },
 };
 
 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
@@ -1780,6 +1782,7 @@ static size_t geneve_get_size(const struct net_device *dev)
 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
+		nla_total_size(0) +	 /* IFLA_GENEVE_INNER_PROTO_INHERIT */
 		0;
 }