diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 2a709daefbc465c41f6e03f38382655e9a35b875..6cec9ce23fd39bed686323f80d6146079b176512 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2322,6 +2322,7 @@ static struct genl_family nbd_genl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= nbd_connect_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(nbd_connect_genl_ops),
+	.resv_start_op	= NBD_CMD_STATUS + 1,
 	.maxattr	= NBD_ATTR_MAX,
 	.policy = nbd_attr_policy,
 	.mcgrps		= nbd_mcast_grps,
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index a208e2b1a9af224e3a9d51facdcd75f02a8e8e55..15c7dc82107f45fc068be92b43d29d3ff9d9ee72 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1859,6 +1859,7 @@ static struct genl_family gtp_genl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= gtp_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(gtp_genl_ops),
+	.resv_start_op	= GTP_CMD_ECHOREQ + 1,
 	.mcgrps		= gtp_genl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(gtp_genl_mcgrps),
 };
diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 38c217bd7c8226c174a6f35a20047f7b8f027b69..2f0544dd7c2ad918480b4f00c3c24962412687b0 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -630,6 +630,7 @@ static struct genl_family hwsim_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = hwsim_nl_ops,
 	.n_small_ops = ARRAY_SIZE(hwsim_nl_ops),
+	.resv_start_op = MAC802154_HWSIM_CMD_NEW_EDGE + 1,
 	.mcgrps = hwsim_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(hwsim_mcgrps),
 };
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index c6d271e5687e9e047ee947bbbe10fd9dae29a13e..adf448a8162b5fd150b6d9203922473311a1ba26 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3404,6 +3404,7 @@ static struct genl_family macsec_fam __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= macsec_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(macsec_genl_ops),
+	.resv_start_op	= MACSEC_CMD_UPD_OFFLOAD + 1,
 };
 
 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index aac133a1e27a5f64fe8f83a456aa0598fad6824c..b1e1239dfadef6296a3e7539104355d3083378a5 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2840,6 +2840,7 @@ static struct genl_family team_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= team_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(team_nl_ops),
+	.resv_start_op	= TEAM_CMD_PORT_LIST_GET + 1,
 	.mcgrps		= team_nl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(team_nl_mcgrps),
 };
diff --git a/drivers/net/wireguard/netlink.c b/drivers/net/wireguard/netlink.c
index d0f3b6d7f40894fdee515c471295d3516da9b13d..0c0644e762e59be435747a043beb1f24beef2e4a 100644
--- a/drivers/net/wireguard/netlink.c
+++ b/drivers/net/wireguard/netlink.c
@@ -621,6 +621,7 @@ static const struct genl_ops genl_ops[] = {
 static struct genl_family genl_family __ro_after_init = {
 	.ops = genl_ops,
 	.n_ops = ARRAY_SIZE(genl_ops),
+	.resv_start_op = WG_CMD_SET_DEVICE + 1,
 	.name = WG_GENL_NAME,
 	.version = WG_GENL_VERSION,
 	.maxattr = WGDEVICE_A_MAX,
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 4fb8f68e5c3b79ebe80f9a481fbdf2447d3abc50..d9054104725e2773792ceb0ac43147e2601ef9ca 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -5288,6 +5288,7 @@ static struct genl_family hwsim_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = hwsim_ops,
 	.n_small_ops = ARRAY_SIZE(hwsim_ops),
+	.resv_start_op = HWSIM_CMD_DEL_MAC_ADDR + 1,
 	.mcgrps = hwsim_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(hwsim_mcgrps),
 };
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 3deaeecb712e35e1b8720cf40c3cf7fd44ec4706..2940559c30860bf36ab4314aa234425610b82917 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -486,6 +486,7 @@ static struct genl_family tcmu_genl_family __ro_after_init = {
 	.netnsok = true,
 	.small_ops = tcmu_genl_ops,
 	.n_small_ops = ARRAY_SIZE(tcmu_genl_ops),
+	.resv_start_op = TCMU_CMD_SET_FEATURES + 1,
 };
 
 #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index))
diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
index 050d243a5fa1f9620ec69be700e11f2c03f97889..e2d78a996b5f320c3b9ae63a6575e1fa23ea272a 100644
--- a/drivers/thermal/thermal_netlink.c
+++ b/drivers/thermal/thermal_netlink.c
@@ -693,6 +693,7 @@ static struct genl_family thermal_gnl_family __ro_after_init = {
 	.policy		= thermal_genl_policy,
 	.small_ops	= thermal_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(thermal_genl_ops),
+	.resv_start_op	= THERMAL_GENL_CMD_CDEV_GET + 1,
 	.mcgrps		= thermal_genl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(thermal_genl_mcgrps),
 };
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index c06c02704461006baa4d2a60db2a30640b100b42..7badf57775972516a158ea7b48fff5c70da899e9 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -1183,6 +1183,7 @@ static struct genl_family vdpa_nl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.ops = vdpa_nl_ops,
 	.n_ops = ARRAY_SIZE(vdpa_nl_ops),
+	.resv_start_op = VDPA_CMD_DEV_VSTATS_GET + 1,
 };
 
 static int vdpa_init(void)
diff --git a/fs/cifs/netlink.c b/fs/cifs/netlink.c
index 291cb606f149679298d46cafe1aa7cee9da16ae1..147d9409252cd3b22bbd0e5436d97867b6309413 100644
--- a/fs/cifs/netlink.c
+++ b/fs/cifs/netlink.c
@@ -51,6 +51,7 @@ struct genl_family cifs_genl_family = {
 	.policy		= cifs_genl_policy,
 	.ops		= cifs_genl_ops,
 	.n_ops		= ARRAY_SIZE(cifs_genl_ops),
+	.resv_start_op	= CIFS_GENL_CMD_SWN_NOTIFY + 1,
 	.mcgrps		= cifs_genl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(cifs_genl_mcgrps),
 };
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index 67f68d48d60ceaa470d1154deb43f2991511fc8c..4de4b8651c6cc290c249b9fa8160361a677c1089 100644
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -75,6 +75,7 @@ static struct genl_family family __ro_after_init = {
 	.version	= DLM_GENL_VERSION,
 	.small_ops	= dlm_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(dlm_nl_ops),
+	.resv_start_op	= DLM_CMD_HELLO + 1,
 	.module		= THIS_MODULE,
 };
 
diff --git a/fs/ksmbd/transport_ipc.c b/fs/ksmbd/transport_ipc.c
index 7cb0eeb07c80876c3504edb88a8550ffb434a533..c9aca21637d5b688470338046cebd542ea5c91a2 100644
--- a/fs/ksmbd/transport_ipc.c
+++ b/fs/ksmbd/transport_ipc.c
@@ -197,6 +197,7 @@ static struct genl_family ksmbd_genl_family = {
 	.module		= THIS_MODULE,
 	.ops		= ksmbd_genl_ops,
 	.n_ops		= ARRAY_SIZE(ksmbd_genl_ops),
+	.resv_start_op	= KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE + 1,
 };
 
 static void ksmbd_nl_init_fixup(void)
diff --git a/include/linux/genl_magic_func.h b/include/linux/genl_magic_func.h
index 939b1a8f571b4fa8e02a58156cd51683bd76bf44..4a4b387181ade4e7296e8a1da540a6b8d61818e4 100644
--- a/include/linux/genl_magic_func.h
+++ b/include/linux/genl_magic_func.h
@@ -294,6 +294,7 @@ static struct genl_family ZZZ_genl_family __ro_after_init = {
 	.ops = ZZZ_genl_ops,
 	.n_ops = ARRAY_SIZE(ZZZ_genl_ops),
 	.mcgrps = ZZZ_genl_mcgrps,
+	.resv_start_op = 42, /* drbd is currently the only user */
 	.n_mcgrps = ARRAY_SIZE(ZZZ_genl_mcgrps),
 	.module = THIS_MODULE,
 };
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 56a50e1c51b97d1b6aebeb1b594df78485f38d8b..a4827b5e1e07bb4f139bb077914f74d39588e436 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -39,6 +39,8 @@ struct genl_info;
  *	undo operations done by pre_doit, for example release locks
  * @mcgrps: multicast groups used by this family
  * @n_mcgrps: number of multicast groups
+ * @resv_start_op: first operation for which reserved fields of the header
+ *	can be validated, new families should leave this field at zero
  * @mcgrp_offset: starting number of multicast group IDs in this family
  *	(private)
  * @ops: the operations supported by this family
@@ -58,6 +60,7 @@ struct genl_family {
 	u8			n_ops;
 	u8			n_small_ops;
 	u8			n_mcgrps;
+	u8			resv_start_op;
 	const struct nla_policy *policy;
 	int			(*pre_doit)(const struct genl_ops *ops,
 					    struct sk_buff *skb,
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index f7e246336218e559c0e5fa0a9d37cc3778fe40b7..8ce3fa0c19e2d7ae7457469da00d184d5834aadc 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -688,6 +688,7 @@ static struct genl_family family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.ops		= taskstats_ops,
 	.n_ops		= ARRAY_SIZE(taskstats_ops),
+	.resv_start_op	= CGROUPSTATS_CMD_GET + 1,
 	.netnsok	= true,
 };
 
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 00875e1d8c44cde121c936a16965fb171ec6f3f1..a5e4a4e976cf3c8dc042ede58e812bbae5d5401f 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -1493,6 +1493,7 @@ struct genl_family batadv_netlink_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = batadv_netlink_ops,
 	.n_small_ops = ARRAY_SIZE(batadv_netlink_ops),
+	.resv_start_op = BATADV_CMD_SET_VLAN + 1,
 	.mcgrps = batadv_netlink_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
 };
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 2afbeb6eca67211bf6cb3f68f09c41a1fa77298e..3396fdf802b642d27852f12f0679ade6dba92366 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -9610,6 +9610,7 @@ static struct genl_family devlink_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= devlink_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(devlink_nl_ops),
+	.resv_start_op	= DEVLINK_CMD_SELFTESTS_RUN + 1,
 	.mcgrps		= devlink_nl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(devlink_nl_mcgrps),
 };
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index 876664fc605e61b0ec51cd82bd1d046add34f6f0..f084a4a6b7ab2c7e5b822be89a34d3c4dd2cc0f6 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -1645,6 +1645,7 @@ static struct genl_family net_drop_monitor_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= dropmon_ops,
 	.n_small_ops	= ARRAY_SIZE(dropmon_ops),
+	.resv_start_op	= NET_DM_CMD_STATS_GET + 1,
 	.mcgrps		= dropmon_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(dropmon_mcgrps),
 };
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index e26079e11835ceeda18b7356b787d75f547d9946..d5e77f1cbbfac24a65480225a08963f69dc2e98d 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -1033,6 +1033,7 @@ static struct genl_family ethtool_genl_family __ro_after_init = {
 	.parallel_ops	= true,
 	.ops		= ethtool_genl_ops,
 	.n_ops		= ARRAY_SIZE(ethtool_genl_ops),
+	.resv_start_op	= ETHTOOL_MSG_MODULE_GET + 1,
 	.mcgrps		= ethtool_nl_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(ethtool_nl_mcgrps),
 };
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 1405c037cf7ab8b42986362336160396206744f0..7174a9092900266c43ac00da4e62130da8ee7dc3 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -522,6 +522,7 @@ static struct genl_family hsr_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = hsr_ops,
 	.n_small_ops = ARRAY_SIZE(hsr_ops),
+	.resv_start_op = HSR_C_SET_NODE_LIST + 1,
 	.mcgrps = hsr_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
 };
diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index b07abc38b4b3d6a73b7a6968aa2d6fc5f7f1f293..7d2de4ee6992b75a0b86eb5e44e5d40d20a98968 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -132,6 +132,7 @@ struct genl_family nl802154_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= ieee802154_ops,
 	.n_small_ops	= ARRAY_SIZE(ieee802154_ops),
+	.resv_start_op	= IEEE802154_LLSEC_DEL_SECLEVEL + 1,
 	.mcgrps		= ieee802154_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(ieee802154_mcgrps),
 };
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index e0b072aecf0f30fe5b410ef0418fc01c765474c9..38c4f3cb010e89f8cd31c453e2fdd1f2291886c5 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -2500,6 +2500,7 @@ static struct genl_family nl802154_fam __ro_after_init = {
 	.module = THIS_MODULE,
 	.ops = nl802154_ops,
 	.n_ops = ARRAY_SIZE(nl802154_ops),
+	.resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
 	.mcgrps = nl802154_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(nl802154_mcgrps),
 };
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index cb5bfb77944cabea2fb88237436f29f3596e1391..0c3c6d0cee290cfef07ec8f3fa7e2089f68db341 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -928,6 +928,7 @@ static struct genl_family fou_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= fou_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(fou_nl_ops),
+	.resv_start_op	= FOU_CMD_GET + 1,
 };
 
 size_t fou_encap_hlen(struct ip_tunnel_encap *e)
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index d58e672be31c764805ca6ad120459eb2d86b4d87..82f4575f9cd90049a5ad4c7329ad1ddc28fc1aa0 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -969,6 +969,7 @@ static struct genl_family tcp_metrics_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= tcp_metrics_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(tcp_metrics_nl_ops),
+	.resv_start_op	= TCP_METRICS_CMD_DEL + 1,
 };
 
 static unsigned int tcpmhash_entries;
diff --git a/net/ipv6/ila/ila_main.c b/net/ipv6/ila/ila_main.c
index 36c58aa257e88c9a918f6664e85dce7fe7e3d246..3faf62530d6a4338686a564ecabd147b806263c9 100644
--- a/net/ipv6/ila/ila_main.c
+++ b/net/ipv6/ila/ila_main.c
@@ -55,6 +55,7 @@ struct genl_family ila_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.ops		= ila_nl_ops,
 	.n_ops		= ARRAY_SIZE(ila_nl_ops),
+	.resv_start_op	= ILA_CMD_FLUSH + 1,
 };
 
 static __net_init int ila_init_net(struct net *net)
diff --git a/net/ipv6/ioam6.c b/net/ipv6/ioam6.c
index 1098131ed90c5027480dd2fd83e77cd531ddcfe4..571f0e4d9cf3d085bf19a6497aa33623d1532aeb 100644
--- a/net/ipv6/ioam6.c
+++ b/net/ipv6/ioam6.c
@@ -619,6 +619,7 @@ static struct genl_family ioam6_genl_family __ro_after_init = {
 	.parallel_ops	= true,
 	.ops		= ioam6_genl_ops,
 	.n_ops		= ARRAY_SIZE(ioam6_genl_ops),
+	.resv_start_op	= IOAM6_CMD_NS_SET_SCHEMA + 1,
 	.module		= THIS_MODULE,
 };
 
diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index 73aaabf0e966551a1b1e12b12888475a13dbf74b..5421cc7c935f5ef1da9c136ce0a94bde1b86e96e 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -499,6 +499,7 @@ static struct genl_family seg6_genl_family __ro_after_init = {
 	.parallel_ops	= true,
 	.ops		= seg6_genl_ops,
 	.n_ops		= ARRAY_SIZE(seg6_genl_ops),
+	.resv_start_op	= SEG6_CMD_GET_TUNSRC + 1,
 	.module		= THIS_MODULE,
 };
 
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index 96eb91be9238ba13413e7948df07f1084389fd83..a901fd14fe3bfe320951475f5f8a0880c3bdf865 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -989,6 +989,7 @@ static struct genl_family l2tp_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= l2tp_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(l2tp_nl_ops),
+	.resv_start_op	= L2TP_CMD_SESSION_GET + 1,
 	.mcgrps		= l2tp_multicast_group,
 	.n_mcgrps	= ARRAY_SIZE(l2tp_multicast_group),
 };
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 291b5da42fdb647278dbff41dc8cec6b2df10b30..a3e4ee7af0ee0cc64fe0208dd3beab4ac29160d7 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -2280,6 +2280,7 @@ static struct genl_family mptcp_genl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= mptcp_pm_ops,
 	.n_small_ops	= ARRAY_SIZE(mptcp_pm_ops),
+	.resv_start_op	= MPTCP_PM_CMD_SUBFLOW_DESTROY + 1,
 	.mcgrps		= mptcp_pm_mcgrps,
 	.n_mcgrps	= ARRAY_SIZE(mptcp_pm_mcgrps),
 };
diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
index c189b4c8a1823e328367c2c98ff9caf5be69286b..d27f4eccce6d79e649dc8e6d84d4113c0f5b6cd6 100644
--- a/net/ncsi/ncsi-netlink.c
+++ b/net/ncsi/ncsi-netlink.c
@@ -768,6 +768,7 @@ static struct genl_family ncsi_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = ncsi_ops,
 	.n_small_ops = ARRAY_SIZE(ncsi_ops),
+	.resv_start_op = NCSI_CMD_SET_CHANNEL_MASK + 1,
 };
 
 static int __init ncsi_init_netlink(void)
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index efab2b06d3732b522b9e5d07982abf0363870fff..818b0b058b10c06e634610e67faff65ac4583d7f 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -4005,6 +4005,7 @@ static struct genl_family ip_vs_genl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= ip_vs_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(ip_vs_genl_ops),
+	.resv_start_op	= IPVS_CMD_FLUSH + 1,
 };
 
 static int __init ip_vs_genl_register(void)
diff --git a/net/netlabel/netlabel_calipso.c b/net/netlabel/netlabel_calipso.c
index 91a19c3ea1a365a871dcf6a617e7f301bf5f899e..f1d5b8465217802a3015cae4edef70cf67b22834 100644
--- a/net/netlabel/netlabel_calipso.c
+++ b/net/netlabel/netlabel_calipso.c
@@ -344,6 +344,7 @@ static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = netlbl_calipso_ops,
 	.n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
+	.resv_start_op = NLBL_CALIPSO_C_LISTALL + 1,
 };
 
 /* NetLabel Generic NETLINK Protocol Functions
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 894e6b8f1a8681605dbeefe41fa5a22c3e8a3b43..fa08ee75ac0635c38054629c70ed620b6c4a4def 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -767,6 +767,7 @@ static struct genl_family netlbl_cipsov4_gnl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = netlbl_cipsov4_ops,
 	.n_small_ops = ARRAY_SIZE(netlbl_cipsov4_ops),
+	.resv_start_op = NLBL_CIPSOV4_C_LISTALL + 1,
 };
 
 /*
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 032b7d7b32c7658fa9bcf9d335eaaefe0cb54f7e..689eaa2afbecd73118f9ed2ec10ba2be5ce39c4f 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -826,6 +826,7 @@ static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = netlbl_mgmt_genl_ops,
 	.n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
+	.resv_start_op = NLBL_MGMT_C_VERSION + 1,
 };
 
 /*
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 0555dffd80e0533ad84cf9bb94cba37cfd0c3c61..9996883bf2b78d3ca0399fc622679e4bb04d5541 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -1374,6 +1374,7 @@ static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.small_ops = netlbl_unlabel_genl_ops,
 	.n_small_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops),
+	.resv_start_op = NLBL_UNLABEL_C_STATICLISTDEF + 1,
 };
 
 /*
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 76aed0571e3a6d31d0ca2171b590cf7536321fa3..7c136de117eb8b30e1d8474851d7b8a9530990ab 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -757,6 +757,9 @@ static int genl_family_rcv_msg(const struct genl_family *family,
 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
 		return -EINVAL;
 
+	if (hdr->cmd >= family->resv_start_op && hdr->reserved)
+		return -EINVAL;
+
 	if (genl_get_cmd(hdr->cmd, family, &op))
 		return -EOPNOTSUPP;
 
@@ -1348,6 +1351,7 @@ static struct genl_family genl_ctrl __ro_after_init = {
 	.module = THIS_MODULE,
 	.ops = genl_ctrl_ops,
 	.n_ops = ARRAY_SIZE(genl_ctrl_ops),
+	.resv_start_op = CTRL_CMD_GETPOLICY + 1,
 	.mcgrps = genl_ctrl_groups,
 	.n_mcgrps = ARRAY_SIZE(genl_ctrl_groups),
 	.id = GENL_ID_CTRL,
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 7c62417ccfd78a76937fa7cf7491b5556d5a1603..9d91087b93992bdf90f1f6a4f8960c3eed77d81b 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1783,6 +1783,7 @@ static struct genl_family nfc_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 	.ops = nfc_genl_ops,
 	.n_ops = ARRAY_SIZE(nfc_genl_ops),
+	.resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
 	.mcgrps = nfc_genl_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
 };
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 4e70df91d0f2a08f36c2b19860cf21924739bafb..48e8f5c29b67eea5ffb617bc782c61a412e210f9 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -2283,6 +2283,7 @@ struct genl_family dp_ct_limit_genl_family __ro_after_init = {
 	.parallel_ops = true,
 	.small_ops = ct_limit_genl_ops,
 	.n_small_ops = ARRAY_SIZE(ct_limit_genl_ops),
+	.resv_start_op = OVS_CT_LIMIT_CMD_GET + 1,
 	.mcgrps = &ovs_ct_limit_multicast_group,
 	.n_mcgrps = 1,
 	.module = THIS_MODULE,
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index e4667700336b0ac24a1f7f13f06c2486b85bab46..8f49e2359a1b9395bb73b75c60e8b995893d77d4 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -692,6 +692,7 @@ static struct genl_family dp_packet_genl_family __ro_after_init = {
 	.parallel_ops = true,
 	.small_ops = dp_packet_genl_ops,
 	.n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
+	.resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
 	.module = THIS_MODULE,
 };
 
@@ -1509,6 +1510,7 @@ static struct genl_family dp_flow_genl_family __ro_after_init = {
 	.parallel_ops = true,
 	.small_ops = dp_flow_genl_ops,
 	.n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
+	.resv_start_op = OVS_FLOW_CMD_SET + 1,
 	.mcgrps = &ovs_dp_flow_multicast_group,
 	.n_mcgrps = 1,
 	.module = THIS_MODULE,
@@ -2051,6 +2053,7 @@ static struct genl_family dp_datapath_genl_family __ro_after_init = {
 	.parallel_ops = true,
 	.small_ops = dp_datapath_genl_ops,
 	.n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
+	.resv_start_op = OVS_DP_CMD_SET + 1,
 	.mcgrps = &ovs_dp_datapath_multicast_group,
 	.n_mcgrps = 1,
 	.module = THIS_MODULE,
diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 04a060ac7fdf6e1f7de8fbf19880870ece8ea520..51111a9009bdb73009b3103c05723042f823716e 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -720,6 +720,7 @@ struct genl_family dp_meter_genl_family __ro_after_init = {
 	.parallel_ops = true,
 	.small_ops = dp_meter_genl_ops,
 	.n_small_ops = ARRAY_SIZE(dp_meter_genl_ops),
+	.resv_start_op = OVS_METER_CMD_GET + 1,
 	.mcgrps = &ovs_meter_multicast_group,
 	.n_mcgrps = 1,
 	.module = THIS_MODULE,
diff --git a/net/psample/psample.c b/net/psample/psample.c
index 118d5d2a81a02308cd15a58fcc426954f111be22..81a794e36f535864869812c2003ff65d4c96efd0 100644
--- a/net/psample/psample.c
+++ b/net/psample/psample.c
@@ -115,6 +115,7 @@ static struct genl_family psample_nl_family __ro_after_init = {
 	.mcgrps		= psample_nl_mcgrps,
 	.small_ops	= psample_nl_ops,
 	.n_small_ops	= ARRAY_SIZE(psample_nl_ops),
+	.resv_start_op	= PSAMPLE_CMD_GET_GROUP + 1,
 	.n_mcgrps	= ARRAY_SIZE(psample_nl_mcgrps),
 };
 
diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c
index c5a62f6f52ba5fc092072899916c0d30971d6d26..621c46c700739df1e6db3f13d089f6f57977a11b 100644
--- a/net/smc/smc_netlink.c
+++ b/net/smc/smc_netlink.c
@@ -142,7 +142,8 @@ struct genl_family smc_gen_nl_family __ro_after_init = {
 	.netnsok =	true,
 	.module =	THIS_MODULE,
 	.ops =		smc_gen_nl_ops,
-	.n_ops =	ARRAY_SIZE(smc_gen_nl_ops)
+	.n_ops =	ARRAY_SIZE(smc_gen_nl_ops),
+	.resv_start_op = SMC_NETLINK_DISABLE_HS_LIMITATION + 1,
 };
 
 int __init smc_nl_init(void)
diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
index 4c3bf6db7038e8f71bec760c119c0ac7cd0c7eec..25fb2fd186e22f5132a1c67d2ac3d8c5658a9fe2 100644
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -715,7 +715,8 @@ static struct genl_family smc_pnet_nl_family __ro_after_init = {
 	.netnsok = true,
 	.module = THIS_MODULE,
 	.ops = smc_pnet_ops,
-	.n_ops =  ARRAY_SIZE(smc_pnet_ops)
+	.n_ops =  ARRAY_SIZE(smc_pnet_ops),
+	.resv_start_op = SMC_PNETID_FLUSH + 1,
 };
 
 bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid)
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index c447cb5f879e70bbce4feca8822292f2600e648b..e8fd257c0e6888b18164f4a63a68ad358ed0459e 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -294,6 +294,7 @@ struct genl_family tipc_genl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.ops		= tipc_genl_v2_ops,
 	.n_ops		= ARRAY_SIZE(tipc_genl_v2_ops),
+	.resv_start_op	= TIPC_NL_ADDR_LEGACY_GET + 1,
 };
 
 int __init tipc_netlink_start(void)
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 0749df80454d4fb8075abc0020584b7f5d1a4662..fc68733673ba6ddca574f67253ede5e340235104 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -1357,6 +1357,7 @@ static struct genl_family tipc_genl_compat_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= tipc_genl_compat_ops,
 	.n_small_ops	= ARRAY_SIZE(tipc_genl_compat_ops),
+	.resv_start_op	= TIPC_GENL_CMD + 1,
 };
 
 int __init tipc_netlink_compat_start(void)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index dad88d231d56037ff8a956a8d342fe8cbfaaf136..e0087176796cbe3b2b46e6cfb450994080a13996 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -17237,6 +17237,7 @@ static struct genl_family nl80211_fam __ro_after_init = {
 	.n_ops = ARRAY_SIZE(nl80211_ops),
 	.small_ops = nl80211_small_ops,
 	.n_small_ops = ARRAY_SIZE(nl80211_small_ops),
+	.resv_start_op = NL80211_CMD_REMOVE_LINK_STA + 1,
 	.mcgrps = nl80211_mcgrps,
 	.n_mcgrps = ARRAY_SIZE(nl80211_mcgrps),
 	.parallel_ops = true,