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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/vsockmon.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/vsockmon.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/net/vsockmon.c b/drivers/net/vsockmon.c new file mode 100644 index 000000000..b1bb1b04b --- /dev/null +++ b/drivers/net/vsockmon.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/ethtool.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/if_arp.h> +#include <net/rtnetlink.h> +#include <net/sock.h> +#include <net/af_vsock.h> +#include <uapi/linux/vsockmon.h> +#include <linux/virtio_vsock.h> + +/* Virtio transport max packet size plus header */ +#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \ + sizeof(struct af_vsockmon_hdr)) + +static int vsockmon_dev_init(struct net_device *dev) +{ + dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); + if (!dev->lstats) + return -ENOMEM; + return 0; +} + +static void vsockmon_dev_uninit(struct net_device *dev) +{ + free_percpu(dev->lstats); +} + +struct vsockmon { + struct vsock_tap vt; +}; + +static int vsockmon_open(struct net_device *dev) +{ + struct vsockmon *vsockmon = netdev_priv(dev); + + vsockmon->vt.dev = dev; + vsockmon->vt.module = THIS_MODULE; + return vsock_add_tap(&vsockmon->vt); +} + +static int vsockmon_close(struct net_device *dev) +{ + struct vsockmon *vsockmon = netdev_priv(dev); + + return vsock_remove_tap(&vsockmon->vt); +} + +static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev) +{ + dev_lstats_add(dev, skb->len); + + dev_kfree_skb(skb); + + return NETDEV_TX_OK; +} + +static void +vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes); + + stats->tx_packets = 0; + stats->tx_bytes = 0; +} + +static int vsockmon_is_valid_mtu(int new_mtu) +{ + return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); +} + +static int vsockmon_change_mtu(struct net_device *dev, int new_mtu) +{ + if (!vsockmon_is_valid_mtu(new_mtu)) + return -EINVAL; + + dev->mtu = new_mtu; + return 0; +} + +static const struct net_device_ops vsockmon_ops = { + .ndo_init = vsockmon_dev_init, + .ndo_uninit = vsockmon_dev_uninit, + .ndo_open = vsockmon_open, + .ndo_stop = vsockmon_close, + .ndo_start_xmit = vsockmon_xmit, + .ndo_get_stats64 = vsockmon_get_stats64, + .ndo_change_mtu = vsockmon_change_mtu, +}; + +static u32 always_on(struct net_device *dev) +{ + return 1; +} + +static const struct ethtool_ops vsockmon_ethtool_ops = { + .get_link = always_on, +}; + +static void vsockmon_setup(struct net_device *dev) +{ + dev->type = ARPHRD_VSOCKMON; + dev->priv_flags |= IFF_NO_QUEUE; + + dev->netdev_ops = &vsockmon_ops; + dev->ethtool_ops = &vsockmon_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; + + dev->mtu = DEFAULT_MTU; +} + +static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { + .kind = "vsockmon", + .priv_size = sizeof(struct vsockmon), + .setup = vsockmon_setup, +}; + +static __init int vsockmon_register(void) +{ + return rtnl_link_register(&vsockmon_link_ops); +} + +static __exit void vsockmon_unregister(void) +{ + rtnl_link_unregister(&vsockmon_link_ops); +} + +module_init(vsockmon_register); +module_exit(vsockmon_unregister); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>"); +MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); +MODULE_ALIAS_RTNL_LINK("vsockmon"); |