166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <linux/rtnetlink.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include "netdev-genl-gen.h"
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static int
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netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
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const struct genl_info *info)
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{
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void *hdr;
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hdr = genlmsg_iput(rsp, info);
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if (!hdr)
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return -EMSGSIZE;
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if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
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nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
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netdev->xdp_features, NETDEV_A_DEV_PAD)) {
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genlmsg_cancel(rsp, hdr);
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return -EINVAL;
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}
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if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
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if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
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netdev->xdp_zc_max_segs)) {
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genlmsg_cancel(rsp, hdr);
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return -EINVAL;
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}
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}
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genlmsg_end(rsp, hdr);
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return 0;
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}
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static void
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netdev_genl_dev_notify(struct net_device *netdev, int cmd)
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{
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struct genl_info info;
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struct sk_buff *ntf;
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if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
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NETDEV_NLGRP_MGMT))
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return;
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genl_info_init_ntf(&info, &netdev_nl_family, cmd);
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ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!ntf)
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return;
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if (netdev_nl_dev_fill(netdev, ntf, &info)) {
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nlmsg_free(ntf);
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return;
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}
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genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
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0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
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}
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int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
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{
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struct net_device *netdev;
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struct sk_buff *rsp;
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u32 ifindex;
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int err;
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if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
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return -EINVAL;
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ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
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rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!rsp)
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return -ENOMEM;
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rtnl_lock();
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netdev = __dev_get_by_index(genl_info_net(info), ifindex);
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if (netdev)
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err = netdev_nl_dev_fill(netdev, rsp, info);
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else
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err = -ENODEV;
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rtnl_unlock();
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if (err)
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goto err_free_msg;
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return genlmsg_reply(rsp, info);
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err_free_msg:
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nlmsg_free(rsp);
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return err;
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}
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int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net *net = sock_net(skb->sk);
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struct net_device *netdev;
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int err = 0;
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rtnl_lock();
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for_each_netdev_dump(net, netdev, cb->args[0]) {
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err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
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if (err < 0)
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break;
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}
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rtnl_unlock();
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if (err != -EMSGSIZE)
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return err;
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return skb->len;
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}
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static int netdev_genl_netdevice_event(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
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switch (event) {
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case NETDEV_REGISTER:
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netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
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break;
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case NETDEV_UNREGISTER:
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netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
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break;
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case NETDEV_XDP_FEAT_CHANGE:
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netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block netdev_genl_nb = {
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.notifier_call = netdev_genl_netdevice_event,
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};
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static int __init netdev_genl_init(void)
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{
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int err;
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err = register_netdevice_notifier(&netdev_genl_nb);
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if (err)
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return err;
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err = genl_register_family(&netdev_nl_family);
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if (err)
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goto err_unreg_ntf;
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return 0;
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err_unreg_ntf:
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unregister_netdevice_notifier(&netdev_genl_nb);
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return err;
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}
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subsys_initcall(netdev_genl_init);
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