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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/nlmon.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/net/nlmon.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/net/nlmon.c b/drivers/net/nlmon.c new file mode 100644 index 000000000..5e19a6839 --- /dev/null +++ b/drivers/net/nlmon.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/ethtool.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <net/net_namespace.h> +#include <linux/if_arp.h> +#include <net/rtnetlink.h> + +static netdev_tx_t nlmon_xmit(struct sk_buff *skb, struct net_device *dev) +{ + dev_lstats_add(dev, skb->len); + + dev_kfree_skb(skb); + + return NETDEV_TX_OK; +} + +static int nlmon_dev_init(struct net_device *dev) +{ + dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); + return dev->lstats == NULL ? -ENOMEM : 0; +} + +static void nlmon_dev_uninit(struct net_device *dev) +{ + free_percpu(dev->lstats); +} + +struct nlmon { + struct netlink_tap nt; +}; + +static int nlmon_open(struct net_device *dev) +{ + struct nlmon *nlmon = netdev_priv(dev); + + nlmon->nt.dev = dev; + nlmon->nt.module = THIS_MODULE; + return netlink_add_tap(&nlmon->nt); +} + +static int nlmon_close(struct net_device *dev) +{ + struct nlmon *nlmon = netdev_priv(dev); + + return netlink_remove_tap(&nlmon->nt); +} + +static void +nlmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + u64 packets, bytes; + + dev_lstats_read(dev, &packets, &bytes); + + stats->rx_packets = packets; + stats->tx_packets = 0; + + stats->rx_bytes = bytes; + stats->tx_bytes = 0; +} + +static u32 always_on(struct net_device *dev) +{ + return 1; +} + +static const struct ethtool_ops nlmon_ethtool_ops = { + .get_link = always_on, +}; + +static const struct net_device_ops nlmon_ops = { + .ndo_init = nlmon_dev_init, + .ndo_uninit = nlmon_dev_uninit, + .ndo_open = nlmon_open, + .ndo_stop = nlmon_close, + .ndo_start_xmit = nlmon_xmit, + .ndo_get_stats64 = nlmon_get_stats64, +}; + +static void nlmon_setup(struct net_device *dev) +{ + dev->type = ARPHRD_NETLINK; + dev->priv_flags |= IFF_NO_QUEUE; + + dev->netdev_ops = &nlmon_ops; + dev->ethtool_ops = &nlmon_ethtool_ops; + dev->needs_free_netdev = true; + + dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | + NETIF_F_HIGHDMA | NETIF_F_LLTX; + dev->flags = IFF_NOARP; + + /* That's rather a softlimit here, which, of course, + * can be altered. Not a real MTU, but what is to be + * expected in most cases. + */ + dev->mtu = NLMSG_GOODSIZE; + dev->min_mtu = sizeof(struct nlmsghdr); +} + +static int nlmon_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + if (tb[IFLA_ADDRESS]) + return -EINVAL; + return 0; +} + +static struct rtnl_link_ops nlmon_link_ops __read_mostly = { + .kind = "nlmon", + .priv_size = sizeof(struct nlmon), + .setup = nlmon_setup, + .validate = nlmon_validate, +}; + +static __init int nlmon_register(void) +{ + return rtnl_link_register(&nlmon_link_ops); +} + +static __exit void nlmon_unregister(void) +{ + rtnl_link_unregister(&nlmon_link_ops); +} + +module_init(nlmon_register); +module_exit(nlmon_unregister); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); +MODULE_AUTHOR("Mathieu Geli <geli@enseirb.fr>"); +MODULE_DESCRIPTION("Netlink monitoring device"); +MODULE_ALIAS_RTNL_LINK("nlmon"); |