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 u32 portid, u32 seq, int flags, u32 cmd)
17 hdr = genlmsg_put(rsp, portid, seq, &netdev_nl_family, flags, cmd);
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 genlmsg_end(rsp, hdr);
34 netdev_genl_dev_notify(struct net_device *netdev, int cmd)
38 if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
42 ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
46 if (netdev_nl_dev_fill(netdev, ntf, 0, 0, 0, cmd)) {
51 genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
52 0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
55 int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
57 struct net_device *netdev;
62 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
65 ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
67 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
73 netdev = __dev_get_by_index(genl_info_net(info), ifindex);
75 err = netdev_nl_dev_fill(netdev, rsp, info->snd_portid,
76 info->snd_seq, 0, info->genlhdr->cmd);
85 return genlmsg_reply(rsp, info);
92 int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
94 struct net *net = sock_net(skb->sk);
95 struct net_device *netdev;
105 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
106 struct hlist_head *head;
109 head = &net->dev_index_head[h];
110 hlist_for_each_entry(netdev, head, index_hlist) {
113 err = netdev_nl_dev_fill(netdev, skb,
114 NETLINK_CB(cb->skb).portid,
115 cb->nlh->nlmsg_seq, 0,
126 if (err != -EMSGSIZE)
131 cb->seq = net->dev_base_seq;
136 static int netdev_genl_netdevice_event(struct notifier_block *nb,
137 unsigned long event, void *ptr)
139 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
142 case NETDEV_REGISTER:
143 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
145 case NETDEV_UNREGISTER:
146 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
148 case NETDEV_XDP_FEAT_CHANGE:
149 netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
156 static struct notifier_block netdev_genl_nb = {
157 .notifier_call = netdev_genl_netdevice_event,
160 static int __init netdev_genl_init(void)
164 err = register_netdevice_notifier(&netdev_genl_nb);
168 err = genl_register_family(&netdev_nl_family);
175 unregister_netdevice_notifier(&netdev_genl_nb);
179 subsys_initcall(netdev_genl_init);