1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/netdevice.h>
4 #include <linux/notifier.h>
5 #include <linux/rtnetlink.h>
6 #include <net/net_namespace.h>
9 #include "netdev-genl-gen.h"
12 netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
13 const struct genl_info *info)
17 hdr = genlmsg_iput(rsp, info);
21 if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
22 nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
23 netdev->xdp_features, NETDEV_A_DEV_PAD)) {
24 genlmsg_cancel(rsp, hdr);
28 if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
29 if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
30 netdev->xdp_zc_max_segs)) {
31 genlmsg_cancel(rsp, hdr);
36 genlmsg_end(rsp, hdr);
42 netdev_genl_dev_notify(struct net_device *netdev, int cmd)
44 struct genl_info info;
47 if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
51 genl_info_init_ntf(&info, &netdev_nl_family, cmd);
53 ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
57 if (netdev_nl_dev_fill(netdev, ntf, &info)) {
62 genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
63 0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
66 int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
68 struct net_device *netdev;
73 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
76 ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
78 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
84 netdev = __dev_get_by_index(genl_info_net(info), ifindex);
86 err = netdev_nl_dev_fill(netdev, rsp, info);
95 return genlmsg_reply(rsp, info);
102 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
104 struct net *net = sock_net(skb->sk);
105 struct net_device *netdev;
109 for_each_netdev_dump(net, netdev, cb->args[0]) {
110 err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
116 if (err != -EMSGSIZE)
122 static int netdev_genl_netdevice_event(struct notifier_block *nb,
123 unsigned long event, void *ptr)
125 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
128 case NETDEV_REGISTER:
129 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
131 case NETDEV_UNREGISTER:
132 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
134 case NETDEV_XDP_FEAT_CHANGE:
135 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
142 static struct notifier_block netdev_genl_nb = {
143 .notifier_call = netdev_genl_netdevice_event,
146 static int __init netdev_genl_init(void)
150 err = register_netdevice_notifier(&netdev_genl_nb);
154 err = genl_register_family(&netdev_nl_family);
161 unregister_netdevice_notifier(&netdev_genl_nb);
165 subsys_initcall(netdev_genl_init);