diff options
Diffstat (limited to 'drivers/net/nlmon.c')
| -rw-r--r-- | drivers/net/nlmon.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/net/nlmon.c b/drivers/net/nlmon.c new file mode 100644 index 000000000000..b57ce5f48962 --- /dev/null +++ b/drivers/net/nlmon.c @@ -0,0 +1,181 @@ +#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> + +struct pcpu_lstats { + u64 packets; + u64 bytes; + struct u64_stats_sync syncp; +}; + +static netdev_tx_t nlmon_xmit(struct sk_buff *skb, struct net_device *dev) +{ + int len = skb->len; + struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats); + + u64_stats_update_begin(&stats->syncp); + stats->bytes += len; + stats->packets++; + u64_stats_update_end(&stats->syncp); + + dev_kfree_skb(skb); + + return NETDEV_TX_OK; +} + +static int nlmon_is_valid_mtu(int new_mtu) +{ + /* Note that in netlink we do not really have an upper limit. On + * default, we use NLMSG_GOODSIZE. Here at least we should make + * sure that it's at least the header size. + */ + return new_mtu >= (int) sizeof(struct nlmsghdr); +} + +static int nlmon_change_mtu(struct net_device *dev, int new_mtu) +{ + if (!nlmon_is_valid_mtu(new_mtu)) + return -EINVAL; + + dev->mtu = new_mtu; + return 0; +} + +static int nlmon_dev_init(struct net_device *dev) +{ + dev->lstats = alloc_percpu(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 struct rtnl_link_stats64 * +nlmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + int i; + u64 bytes = 0, packets = 0; + + for_each_possible_cpu(i) { + const struct pcpu_lstats *nl_stats; + u64 tbytes, tpackets; + unsigned int start; + + nl_stats = per_cpu_ptr(dev->lstats, i); + + do { + start = u64_stats_fetch_begin_bh(&nl_stats->syncp); + tbytes = nl_stats->bytes; + tpackets = nl_stats->packets; + } while (u64_stats_fetch_retry_bh(&nl_stats->syncp, start)); + + packets += tpackets; + bytes += tbytes; + } + + stats->rx_packets = packets; + stats->tx_packets = 0; + + stats->rx_bytes = bytes; + stats->tx_bytes = 0; + + return stats; +} + +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, + .ndo_change_mtu = nlmon_change_mtu, +}; + +static void nlmon_setup(struct net_device *dev) +{ + dev->type = ARPHRD_NETLINK; + dev->tx_queue_len = 0; + + dev->netdev_ops = &nlmon_ops; + dev->ethtool_ops = &nlmon_ethtool_ops; + dev->destructor = free_netdev; + + dev->features = NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; + 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; +} + +static int nlmon_validate(struct nlattr *tb[], struct nlattr *data[]) +{ + 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"); |