[net-next,v6,03/11] net: Use link netns in newlink() of rtnl_link_ops

Message ID	20241218130909.2173-4-shaw.leon@gmail.com
State	New
Headers	show Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D75431B0434; Wed, 18 Dec 2024 13:09:50 +0000 (UTC) From: Xiao Liang <shaw.leon@gmail.com> To: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Kuniyuki Iwashima <kuniyu@amazon.com>, Jakub Kicinski <kuba@kernel.org>, Donald Hunter <donald.hunter@gmail.com>, Paolo Abeni <pabeni@redhat.com> Cc: "David S. Miller" <davem@davemloft.net>, David Ahern <dsahern@kernel.org>, Eric Dumazet <edumazet@google.com>, Ido Schimmel <idosch@nvidia.com>, Andrew Lunn <andrew+netdev@lunn.ch>, Simon Horman <horms@kernel.org>, Shuah Khan <shuah@kernel.org>, Jiri Pirko <jiri@resnulli.us>, Hangbin Liu <liuhangbin@gmail.com>, linux-rdma@vger.kernel.org, linux-can@vger.kernel.org, osmocom-net-gprs@lists.osmocom.org, bpf@vger.kernel.org, linux-ppp@vger.kernel.org, wireguard@lists.zx2c4.com, linux-wireless@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org, bridge@lists.linux.dev, linux-wpan@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v6 03/11] net: Use link netns in newlink() of rtnl_link_ops Date: Wed, 18 Dec 2024 21:09:01 +0800 Message-ID: <20241218130909.2173-4-shaw.leon@gmail.com> In-Reply-To: <20241218130909.2173-1-shaw.leon@gmail.com> References: <20241218130909.2173-1-shaw.leon@gmail.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	net: Improve netns handling in rtnetlink \| expand [net-next,v6,00/11] net: Improve netns handling in rtnetlink [net-next,v6,01/11] rtnetlink: Lookup device in target netns when creating link [net-next,v6,02/11] rtnetlink: Pack newlink() params into struct [net-next,v6,03/11] net: Use link netns in newlink() of rtnl_link_ops [net-next,v6,04/11] ieee802154: 6lowpan: Use link netns in newlink() of rtnl_link_ops [net-next,v6,05/11] net: ip_tunnel: Use link netns in newlink() of rtnl_link_ops [net-next,v6,06/11] net: ipv6: Use link netns in newlink() of rtnl_link_ops [net-next,v6,07/11] net: xfrm: Use link netns in newlink() of rtnl_link_ops [net-next,v6,08/11] rtnetlink: Remove "net" from newlink params [net-next,v6,09/11] rtnetlink: Create link directly in target net namespace [net-next,v6,10/11] selftests: net: Add python context manager for netns entering [net-next,v6,11/11] selftests: net: Add test cases for link and peer netns

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c index 61f2457aab77..ac01650b0ac2 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c @@ -99,10 +99,10 @@ static int ipoib_changelink(struct net_device *dev, struct nlattr *tb[], static int ipoib_new_child_link(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct net_device *pdev; struct ipoib_dev_priv *ppriv; @@ -112,7 +112,7 @@ static int ipoib_new_child_link(struct rtnl_newlink_params *params) if (!tb[IFLA_LINK]) return -EINVAL; - pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + pdev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!pdev || pdev->type != ARPHRD_INFINIBAND) return -ENODEV; diff --git a/drivers/net/amt.c b/drivers/net/amt.c index 85878abb51d2..de4ea1a3f3d3 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -3163,16 +3163,16 @@ static int amt_validate(struct nlattr *tb[], struct nlattr *data[], static int amt_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; struct nlattr **tb = params->tb; - struct net *net = params->net; struct amt_dev *amt; int err = -EINVAL; amt = netdev_priv(dev); - amt->net = net; + amt->net = link_net; amt->mode = nla_get_u32(data[IFLA_AMT_MODE]); if (data[IFLA_AMT_MAX_TUNNELS] && @@ -3187,7 +3187,7 @@ static int amt_newlink(struct rtnl_newlink_params *params) amt->hash_buckets = AMT_HSIZE; amt->nr_tunnels = 0; get_random_bytes(&amt->hash_seed, sizeof(amt->hash_seed)); - amt->stream_dev = dev_get_by_index(net, + amt->stream_dev = dev_get_by_index(link_net, nla_get_u32(data[IFLA_AMT_LINK])); if (!amt->stream_dev) { NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK], diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c index 4c2a50bbf7c0..1fe5dcae38f5 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -700,11 +700,11 @@ static void bareudp_dellink(struct net_device *dev, struct list_head *head) static int bareudp_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; struct nlattr **tb = params->tb; - struct net *net = params->net; struct bareudp_conf conf; int err; @@ -712,7 +712,7 @@ static int bareudp_newlink(struct rtnl_newlink_params *params) if (err) return err; - err = bareudp_configure(net, dev, &conf, extack); + err = bareudp_configure(link_net, dev, &conf, extack); if (err) return err; diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c index 5d7717c22fab..e3c52c191086 100644 --- a/drivers/net/can/vxcan.c +++ b/drivers/net/can/vxcan.c @@ -174,10 +174,10 @@ static struct rtnl_link_ops vxcan_link_ops; static int vxcan_newlink(struct rtnl_newlink_params *params) { + struct net *peer_net = rtnl_newlink_peer_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *peer_net = params->net; struct nlattr **tb = params->tb; struct vxcan_priv *priv; struct net_device *peer; diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c index b4834651c693..7a6b746a3b15 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -120,10 +120,10 @@ static void rmnet_unregister_bridge(struct rmnet_port *port) static int rmnet_newlink(struct rtnl_newlink_params *params) { u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION; + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct net_device *real_dev; int mode = RMNET_EPMODE_VND; @@ -137,7 +137,7 @@ static int rmnet_newlink(struct rtnl_newlink_params *params) return -EINVAL; } - real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!real_dev) { NL_SET_ERR_MSG_MOD(extack, "link does not exist"); return -ENODEV; diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index ea0a98a513ed..3dec3e5aae79 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -1616,11 +1616,11 @@ static void geneve_link_config(struct net_device *dev, static int geneve_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; struct nlattr **tb = params->tb; - struct net *net = params->net; struct geneve_config cfg = { .df = GENEVE_DF_UNSET, .use_udp6_rx_checksums = false, @@ -1634,7 +1634,7 @@ static int geneve_newlink(struct rtnl_newlink_params *params) if (err) return err; - err = geneve_configure(net, dev, extack, &cfg); + err = geneve_configure(link_net, dev, extack, &cfg); if (err) return err; diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index 46d5734da7f3..50f8a0cd1d4b 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -1462,9 +1462,9 @@ static int gtp_create_sockets(struct gtp_dev *gtp, const struct nlattr *nla, static int gtp_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; unsigned int role = GTP_ROLE_GGSN; struct gtp_dev *gtp; struct gtp_net *gn; @@ -1495,7 +1495,7 @@ static int gtp_newlink(struct rtnl_newlink_params *params) gtp->restart_count = nla_get_u8_default(data[IFLA_GTP_RESTART_COUNT], 0); - gtp->net = src_net; + gtp->net = link_net; err = gtp_hashtable_new(gtp, hashsize); if (err < 0) diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c index a994fd54ada4..7d19771383c7 100644 --- a/drivers/net/ipvlan/ipvlan_main.c +++ b/drivers/net/ipvlan/ipvlan_main.c @@ -534,10 +534,10 @@ static int ipvlan_nl_fillinfo(struct sk_buff *skb, int ipvlan_link_new(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct ipvl_dev *ipvlan; struct ipvl_port *port; @@ -550,7 +550,7 @@ int ipvlan_link_new(struct rtnl_newlink_params *params) if (!tb[IFLA_LINK]) return -EINVAL; - phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + phy_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!phy_dev) return -ENODEV; diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 9da111a6629c..ad53a67410dc 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -4143,11 +4143,11 @@ static struct lock_class_key macsec_netdev_addr_lock_key; static int macsec_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; struct nlattr **tb = params->tb; - struct net *net = params->net; rx_handler_func_t *rx_handler; u8 icv_len = MACSEC_DEFAULT_ICV_LEN; struct net_device *real_dev; @@ -4159,7 +4159,7 @@ static int macsec_newlink(struct rtnl_newlink_params *params) if (!tb[IFLA_LINK]) return -EINVAL; - real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); + real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!real_dev) return -ENODEV; if (real_dev->type != ARPHRD_ETHER) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 1915f54bd35a..7050a061b2b9 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -1567,8 +1567,9 @@ EXPORT_SYMBOL_GPL(macvlan_common_newlink); static int macvlan_newlink(struct rtnl_newlink_params *params) { - return macvlan_common_newlink(params->net, params->dev, params->tb, - params->data, params->extack); + return macvlan_common_newlink(rtnl_newlink_link_net(params), + params->dev, params->tb, params->data, + params->extack); } void macvlan_dellink(struct net_device *dev, struct list_head *head) diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index e5fd8a147310..01cf1efbe4c5 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -105,8 +105,8 @@ static int macvtap_newlink(struct rtnl_newlink_params *params) /* Don't put anything that may fail after macvlan_common_newlink * because we can't undo what it does. */ - err = macvlan_common_newlink(params->net, dev, params->tb, params->data, - params->extack); + err = macvlan_common_newlink(rtnl_newlink_link_net(params), dev, + params->tb, params->data, params->extack); if (err) { netdev_rx_handler_unregister(dev); return err; diff --git a/drivers/net/netkit.c b/drivers/net/netkit.c index f5527bb533ab..79a2c37990fd 100644 --- a/drivers/net/netkit.c +++ b/drivers/net/netkit.c @@ -329,10 +329,10 @@ static struct rtnl_link_ops netkit_link_ops; static int netkit_new_link(struct rtnl_newlink_params *params) { + struct net *peer_net = rtnl_newlink_peer_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *peer_net = params->net; struct nlattr **tb = params->tb; struct nlattr *peer_tb[IFLA_MAX + 1], **tbp = tb, *attr; enum netkit_action policy_prim = NETKIT_PASS; diff --git a/drivers/net/pfcp.c b/drivers/net/pfcp.c index cb936da99674..e98724a71c22 100644 --- a/drivers/net/pfcp.c +++ b/drivers/net/pfcp.c @@ -186,14 +186,14 @@ static int pfcp_add_sock(struct pfcp_dev *pfcp) static int pfcp_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct net_device *dev = params->dev; - struct net *net = params->net; struct pfcp_dev *pfcp; struct pfcp_net *pn; int err; pfcp = netdev_priv(dev); - pfcp->net = net; + pfcp->net = link_net; err = pfcp_add_sock(pfcp); if (err) { diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index 5b58e7bb4e7b..316b6d01436b 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1305,9 +1305,9 @@ static int ppp_nl_validate(struct nlattr *tb[], struct nlattr *data[], static int ppp_nl_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct ppp_config conf = { .unit = -1, @@ -1345,7 +1345,7 @@ static int ppp_nl_newlink(struct rtnl_newlink_params *params) if (!tb[IFLA_IFNAME] || !nla_len(tb[IFLA_IFNAME]) || !*(char *)nla_data(tb[IFLA_IFNAME])) conf.ifname_is_set = false; - err = ppp_dev_configure(src_net, dev, &conf); + err = ppp_dev_configure(link_net, dev, &conf); out_unlock: mutex_unlock(&ppp_mutex); diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 04229c07023d..11ee821edcd6 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -1767,10 +1767,10 @@ static int veth_init_queues(struct net_device *dev, struct nlattr *tb[]) static int veth_newlink(struct rtnl_newlink_params *params) { + struct net *peer_net = rtnl_newlink_peer_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *peer_net = params->net; struct nlattr **tb = params->tb; int err; struct net_device *peer; diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index b084adb6d319..751da726cf56 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -4395,10 +4395,10 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], static int vxlan_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct vxlan_config conf; int err; @@ -4407,7 +4407,7 @@ static int vxlan_newlink(struct rtnl_newlink_params *params) if (err) return err; - return __vxlan_dev_create(src_net, dev, &conf, extack); + return __vxlan_dev_create(link_net, dev, &conf, extack); } static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], diff --git a/drivers/net/wireguard/device.c b/drivers/net/wireguard/device.c index 92aac080d2b5..b2ba9d9c6ad3 100644 --- a/drivers/net/wireguard/device.c +++ b/drivers/net/wireguard/device.c @@ -309,13 +309,13 @@ static void wg_setup(struct net_device *dev) static int wg_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct net_device *dev = params->dev; - struct net *src_net = params->net; struct wg_device *wg; int ret = -ENOMEM; wg = netdev_priv(dev); - rcu_assign_pointer(wg->creating_net, src_net); + rcu_assign_pointer(wg->creating_net, link_net); init_rwsem(&wg->static_identity.lock); mutex_init(&wg->socket_update_lock); mutex_init(&wg->device_update_lock); diff --git a/drivers/net/wireless/virtual/virt_wifi.c b/drivers/net/wireless/virtual/virt_wifi.c index d64eb03e0ac8..5e7c7a1d7d5f 100644 --- a/drivers/net/wireless/virtual/virt_wifi.c +++ b/drivers/net/wireless/virtual/virt_wifi.c @@ -521,10 +521,10 @@ static rx_handler_result_t virt_wifi_rx_handler(struct sk_buff **pskb) /* Called with rtnl lock held. */ static int virt_wifi_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct virt_wifi_netdev_priv *priv; - struct net *src_net = params->net; struct nlattr **tb = params->tb; int err; @@ -536,7 +536,7 @@ static int virt_wifi_newlink(struct rtnl_newlink_params *params) netif_carrier_off(dev); priv->upperdev = dev; - priv->lowerdev = __dev_get_by_index(src_net, + priv->lowerdev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!priv->lowerdev) diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c index 908a3db61477..06a2172d1856 100644 --- a/drivers/net/wwan/wwan_core.c +++ b/drivers/net/wwan/wwan_core.c @@ -1070,7 +1070,7 @@ static void wwan_create_default_link(struct wwan_device *wwandev, struct nlmsghdr *nlh; struct sk_buff *msg; struct rtnl_newlink_params params = { - .net = &init_net, + .src_net = &init_net, .tb = tb, .data = data, }; diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c index 26a0f0a2ce27..0a9930017bba 100644 --- a/net/8021q/vlan_netlink.c +++ b/net/8021q/vlan_netlink.c @@ -137,10 +137,10 @@ static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], static int vlan_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct net_device *real_dev; struct vlan_dev_priv *vlan; @@ -160,7 +160,7 @@ static int vlan_newlink(struct rtnl_newlink_params *params) return -EINVAL; } - real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!real_dev) { NL_SET_ERR_MSG_MOD(extack, "link does not exist"); return -ENODEV; diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c index 08d38e2e2962..9bc564e81827 100644 --- a/net/hsr/hsr_netlink.c +++ b/net/hsr/hsr_netlink.c @@ -31,10 +31,10 @@ static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = { */ static int hsr_newlink(struct rtnl_newlink_params *params) { + struct net *link_net = rtnl_newlink_link_net(params); struct netlink_ext_ack *extack = params->extack; struct net_device *dev = params->dev; struct nlattr **data = params->data; - struct net *src_net = params->net; enum hsr_version proto_version; unsigned char multicast_spec; u8 proto = HSR_PROTOCOL_HSR; @@ -48,7 +48,7 @@ static int hsr_newlink(struct rtnl_newlink_params *params) NL_SET_ERR_MSG_MOD(extack, "Slave1 device not specified"); return -EINVAL; } - link[0] = __dev_get_by_index(src_net, + link[0] = __dev_get_by_index(link_net, nla_get_u32(data[IFLA_HSR_SLAVE1])); if (!link[0]) { NL_SET_ERR_MSG_MOD(extack, "Slave1 does not exist"); @@ -58,7 +58,7 @@ static int hsr_newlink(struct rtnl_newlink_params *params) NL_SET_ERR_MSG_MOD(extack, "Slave2 device not specified"); return -EINVAL; } - link[1] = __dev_get_by_index(src_net, + link[1] = __dev_get_by_index(link_net, nla_get_u32(data[IFLA_HSR_SLAVE2])); if (!link[1]) { NL_SET_ERR_MSG_MOD(extack, "Slave2 does not exist"); @@ -71,7 +71,7 @@ static int hsr_newlink(struct rtnl_newlink_params *params) } if (data[IFLA_HSR_INTERLINK]) - interlink = __dev_get_by_index(src_net, + interlink = __dev_get_by_index(link_net, nla_get_u32(data[IFLA_HSR_INTERLINK])); if (interlink && interlink == link[0]) {

[net-next,v6,03/11] net: Use link netns in newlink() of rtnl_link_ops

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