lwtunnel: be STRICT to validate the new LWTUNNEL_IP(6)_OPTS

LWTUNNEL_IP(6)_OPTS are the new items in ip(6)_tun_policy, which
are parsed by nla_parse_nested_deprecated(). We should check it
strictly by setting .strict_start_type = LWTUNNEL_IP(6)_OPTS.

This patch also adds missing LWTUNNEL_IP6_OPTS in ip6_tun_policy.

Fixes: 4ece47787077 ("lwtunnel: add options setting and dumping for geneve")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 45405d26d370b7ca4bcbe8cdf3544f10b76632f9..0a7eaadc9a8dcfca0c89f2f076b6a70fe43dce1b 100644 (file)
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -215,6 +215,7 @@ void ip_tunnel_get_stats64(struct net_device *dev,
 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 
 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
+       [LWTUNNEL_IP_UNSPEC]    = { .strict_start_type = LWTUNNEL_IP_OPTS },
        [LWTUNNEL_IP_ID]        = { .type = NLA_U64 },
        [LWTUNNEL_IP_DST]       = { .type = NLA_U32 },
        [LWTUNNEL_IP_SRC]       = { .type = NLA_U32 },
@@ -700,12 +701,14 @@ static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 };
 
 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
+       [LWTUNNEL_IP6_UNSPEC]   = { .strict_start_type = LWTUNNEL_IP6_OPTS },
        [LWTUNNEL_IP6_ID]               = { .type = NLA_U64 },
        [LWTUNNEL_IP6_DST]              = { .len = sizeof(struct in6_addr) },
        [LWTUNNEL_IP6_SRC]              = { .len = sizeof(struct in6_addr) },
        [LWTUNNEL_IP6_HOPLIMIT]         = { .type = NLA_U8 },
        [LWTUNNEL_IP6_TC]               = { .type = NLA_U8 },
        [LWTUNNEL_IP6_FLAGS]            = { .type = NLA_U16 },
+       [LWTUNNEL_IP6_OPTS]             = { .type = NLA_NESTED },
 };
 
 static int ip6_tun_build_state(struct nlattr *attr,