[PATCH net-next v10 03/13] net: Use link/peer netns in newlink() of rtnl_link_ops

Add two helper functions - rtnl_newlink_link_net() and rtnl_newlink_peer_net() for netns fallback logic. Peer netns falls back to link netns, and link netns falls back to source netns.

Convert the use of params->net in netdevice drivers to one of the helper functions for clarity.

Signed-off-by: Xiao Liang shaw.leon@gmail.com Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com --- drivers/infiniband/ulp/ipoib/ipoib_netlink.c | 4 ++-- drivers/net/amt.c | 6 +++--- drivers/net/bareudp.c | 4 ++-- drivers/net/can/vxcan.c | 2 +- .../net/ethernet/qualcomm/rmnet/rmnet_config.c | 4 ++-- drivers/net/geneve.c | 4 ++-- drivers/net/gtp.c | 6 +++--- drivers/net/ipvlan/ipvlan_main.c | 4 ++-- drivers/net/macsec.c | 4 ++-- drivers/net/macvlan.c | 4 ++-- drivers/net/netkit.c | 2 +- drivers/net/pfcp.c | 6 +++--- drivers/net/ppp/ppp_generic.c | 4 ++-- drivers/net/veth.c | 2 +- drivers/net/vxlan/vxlan_core.c | 4 ++-- drivers/net/wireguard/device.c | 4 ++-- drivers/net/wireless/virtual/virt_wifi.c | 4 ++-- drivers/net/wwan/wwan_core.c | 2 +- include/net/rtnetlink.h | 17 +++++++++++++++++ net/8021q/vlan_netlink.c | 4 ++-- net/hsr/hsr_netlink.c | 8 ++++---- 21 files changed, 58 insertions(+), 41 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c index 16cb8ced9f35..53db7c8191e3 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c @@ -101,8 +101,8 @@ static int ipoib_new_child_link(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); 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 net_device *dev, 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 96b7ec9a2c13..53899b70fae1 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -3165,13 +3165,13 @@ static int amt_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct amt_dev *amt = netdev_priv(dev); struct nlattr **data = params->data; struct nlattr **tb = params->tb; - struct net *net = params->net; int err = -EINVAL;

- amt->net = net; + amt->net = link_net; amt->mode = nla_get_u32(data[IFLA_AMT_MODE]);

if (data[IFLA_AMT_MAX_TUNNELS] && @@ -3186,7 +3186,7 @@ static int amt_newlink(struct net_device *dev, 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 fc21dcfb4848..d1473c5f8eef 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -702,9 +702,9 @@ static int bareudp_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); 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 net_device *dev, 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 6f8ebb1cfd7b..99a78a757167 100644 --- a/drivers/net/can/vxcan.c +++ b/drivers/net/can/vxcan.c @@ -176,8 +176,8 @@ static int vxcan_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *peer_net = rtnl_newlink_peer_net(params); 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 8151e91395e2..ba8763cac9d9 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -121,9 +121,9 @@ static int rmnet_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION; 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 net_device *dev, 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 d373a851930c..c7700deefb00 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -1618,9 +1618,9 @@ static int geneve_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); 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 net_device *dev, 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 d6d4326cb908..2cf43e7d0edc 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -1466,8 +1466,8 @@ static int gtp_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); 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; @@ -1498,7 +1498,7 @@ static int gtp_newlink(struct net_device *dev, 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) @@ -1528,7 +1528,7 @@ static int gtp_newlink(struct net_device *dev, goto out_encap; }

- gn = net_generic(src_net, gtp_net_id); + gn = net_generic(link_net, gtp_net_id); list_add(&gtp->list, &gn->gtp_dev_list); dev->priv_destructor = gtp_destructor;

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c index 19ce19ca7e32..b56144ca2fde 100644 --- a/drivers/net/ipvlan/ipvlan_main.c +++ b/drivers/net/ipvlan/ipvlan_main.c @@ -535,9 +535,9 @@ static int ipvlan_nl_fillinfo(struct sk_buff *skb, int ipvlan_link_new(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct ipvl_dev *ipvlan = netdev_priv(dev); struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct ipvl_port *port; struct net_device *phy_dev; @@ -547,7 +547,7 @@ int ipvlan_link_new(struct net_device *dev, 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 1869b0513f57..4de5d63fd577 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -4145,10 +4145,10 @@ static int macsec_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct macsec_dev *macsec = macsec_priv(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; @@ -4157,7 +4157,7 @@ static int macsec_newlink(struct net_device *dev,

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 f903b414eaeb..4e9d54be887c 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -1444,9 +1444,9 @@ int macvlan_common_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct macvlan_dev *vlan = netdev_priv(dev); struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct net_device *lowerdev; struct macvlan_port *port; @@ -1457,7 +1457,7 @@ int macvlan_common_newlink(struct net_device *dev, if (!tb[IFLA_LINK]) return -EINVAL;

- lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + lowerdev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (lowerdev == NULL) return -ENODEV;

diff --git a/drivers/net/netkit.c b/drivers/net/netkit.c index 640a2dbbbd28..751347392570 100644 --- a/drivers/net/netkit.c +++ b/drivers/net/netkit.c @@ -331,13 +331,13 @@ static int netkit_new_link(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *peer_net = rtnl_newlink_peer_net(params); enum netkit_scrub scrub_prim = NETKIT_SCRUB_DEFAULT; enum netkit_scrub scrub_peer = NETKIT_SCRUB_DEFAULT; struct nlattr *peer_tb[IFLA_MAX + 1], **tbp, *attr; enum netkit_action policy_prim = NETKIT_PASS; enum netkit_action policy_peer = NETKIT_PASS; struct nlattr **data = params->data; - struct net *peer_net = params->net; enum netkit_mode mode = NETKIT_L3; unsigned char ifname_assign_type; struct nlattr **tb = params->tb; diff --git a/drivers/net/pfcp.c b/drivers/net/pfcp.c index 7b0575940e1d..f873a92d2445 100644 --- a/drivers/net/pfcp.c +++ b/drivers/net/pfcp.c @@ -188,12 +188,12 @@ static int pfcp_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct pfcp_dev *pfcp = netdev_priv(dev); - struct net *net = params->net; struct pfcp_net *pn; int err;

- pfcp->net = net; + pfcp->net = link_net;

err = pfcp_add_sock(pfcp); if (err) { @@ -207,7 +207,7 @@ static int pfcp_newlink(struct net_device *dev, goto exit_del_pfcp_sock; }

- pn = net_generic(net, pfcp_net_id); + pn = net_generic(link_net, pfcp_net_id); list_add(&pfcp->list, &pn->pfcp_dev_list);

netdev_dbg(dev, "registered new PFCP interface\n"); diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index b3340f8a6149..6220866258fc 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1307,8 +1307,8 @@ static int ppp_nl_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct ppp_config conf = { .unit = -1, @@ -1346,7 +1346,7 @@ static int ppp_nl_newlink(struct net_device *dev, 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 7dfda89f072f..ba3ae2d8092f 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -1769,8 +1769,8 @@ static int veth_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *peer_net = rtnl_newlink_peer_net(params); 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 09a4a5bf1038..f1212a9256f6 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -4404,8 +4404,8 @@ static int vxlan_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct vxlan_config conf; int err; @@ -4414,7 +4414,7 @@ static int vxlan_newlink(struct net_device *dev, 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 404cf05bd72b..c496d35b266d 100644 --- a/drivers/net/wireguard/device.c +++ b/drivers/net/wireguard/device.c @@ -311,11 +311,11 @@ static int wg_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct wg_device *wg = netdev_priv(dev); - struct net *src_net = params->net; int ret = -ENOMEM;

- 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 26905b2b3ba3..f9d11a023313 100644 --- a/drivers/net/wireless/virtual/virt_wifi.c +++ b/drivers/net/wireless/virtual/virt_wifi.c @@ -524,7 +524,7 @@ static int virt_wifi_newlink(struct net_device *dev, struct netlink_ext_ack *extack) { struct virt_wifi_netdev_priv *priv = netdev_priv(dev); - struct net *src_net = params->net; + struct net *link_net = rtnl_newlink_link_net(params); struct nlattr **tb = params->tb; int err;

@@ -534,7 +534,7 @@ static int virt_wifi_newlink(struct net_device *dev, 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 a05c49b4e7f8..63a47d420bc5 100644 --- a/drivers/net/wwan/wwan_core.c +++ b/drivers/net/wwan/wwan_core.c @@ -1065,7 +1065,7 @@ static void wwan_create_default_link(struct wwan_device *wwandev, struct nlattr *tb[IFLA_MAX + 1], *linkinfo[IFLA_INFO_MAX + 1]; struct nlattr *data[IFLA_WWAN_MAX + 1]; struct rtnl_newlink_params params = { - .net = &init_net, + .src_net = &init_net, .tb = tb, .data = data, }; diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h index 563a6a27436c..b22a106621fb 100644 --- a/include/net/rtnetlink.h +++ b/include/net/rtnetlink.h @@ -88,6 +88,23 @@ struct rtnl_newlink_params { struct nlattr **data; };

+/* Get effective link netns from newlink params. Generally, this is link_net + * and falls back to src_net. But for compatibility, a driver may * choose to + * use dev_net(dev) instead. + */ +static inline struct net *rtnl_newlink_link_net(struct rtnl_newlink_params *p) +{ + return p->link_net ? : p->src_net; +} + +/* Get peer netns from newlink params. Fallback to link netns if peer netns is + * not specified explicitly. + */ +static inline struct net *rtnl_newlink_peer_net(struct rtnl_newlink_params *p) +{ + return p->peer_net ? : rtnl_newlink_link_net(p); +} + /** * struct rtnl_link_ops - rtnetlink link operations * diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c index 91df0f96e32a..a000b1ef0520 100644 --- a/net/8021q/vlan_netlink.c +++ b/net/8021q/vlan_netlink.c @@ -139,9 +139,9 @@ static int vlan_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); struct vlan_dev_priv *vlan = vlan_dev_priv(dev); struct nlattr **data = params->data; - struct net *src_net = params->net; struct nlattr **tb = params->tb; struct net_device *real_dev; unsigned int max_mtu; @@ -158,7 +158,7 @@ static int vlan_newlink(struct net_device *dev, 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 39add538ba99..b120470246cc 100644 --- a/net/hsr/hsr_netlink.c +++ b/net/hsr/hsr_netlink.c @@ -33,8 +33,8 @@ static int hsr_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack) { + struct net *link_net = rtnl_newlink_link_net(params); 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 net_device *dev, 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 net_device *dev, 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 net_device *dev, }

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]) {