path: root/net/core/netdev-genl.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <net/busy_poll.h>
#include <net/net_namespace.h>
#include <net/netdev_queues.h>
#include <net/netdev_rx_queue.h>
#include <net/sock.h>
#include <net/xdp.h>
#include <net/xdp_sock.h>
#include <net/page_pool/memory_provider.h>

#include "dev.h"
#include "devmem.h"
#include "netdev-genl-gen.h"

struct netdev_nl_dump_ctx {
	unsigned long	ifindex;
	unsigned int	rxq_idx;
	unsigned int	txq_idx;
	unsigned int	napi_id;
};

static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
{
	NL_ASSERT_CTX_FITS(struct netdev_nl_dump_ctx);

	return (struct netdev_nl_dump_ctx *)cb->ctx;
}

static int
netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
		   const struct genl_info *info)
{
	u64 xsk_features = 0;
	u64 xdp_rx_meta = 0;
	void *hdr;

	netdev_assert_locked(netdev); /* note: rtnl_lock may not be held! */

	hdr = genlmsg_iput(rsp, info);
	if (!hdr)
		return -EMSGSIZE;

#define XDP_METADATA_KFUNC(_, flag, __, xmo) \
	if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \
		xdp_rx_meta |= flag;
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC

	if (netdev->xsk_tx_metadata_ops) {
		if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
			xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
		if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
			xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
		if (netdev->xsk_tx_metadata_ops->tmo_request_launch_time)
			xsk_features |= NETDEV_XSK_FLAGS_TX_LAUNCH_TIME_FIFO;
	}

	if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
	    nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
			      netdev->xdp_features, NETDEV_A_DEV_PAD) ||
	    nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
			      xdp_rx_meta, NETDEV_A_DEV_PAD) ||
	    nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES,
			      xsk_features, NETDEV_A_DEV_PAD))
		goto err_cancel_msg;

	if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
		if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
				netdev->xdp_zc_max_segs))
			goto err_cancel_msg;
	}

	genlmsg_end(rsp, hdr);

	return 0;

err_cancel_msg:
	genlmsg_cancel(rsp, hdr);
	return -EMSGSIZE;
}

static void
netdev_genl_dev_notify(struct net_device *netdev, int cmd)
{
	struct genl_info info;
	struct sk_buff *ntf;

	if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
				NETDEV_NLGRP_MGMT))
		return;

	genl_info_init_ntf(&info, &netdev_nl_family, cmd);

	ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!ntf)
		return;

	if (netdev_nl_dev_fill(netdev, ntf, &info)) {
		nlmsg_free(ntf);
		return;