360 lines
8.3 KiB
C
Executable File
360 lines
8.3 KiB
C
Executable File
/*
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* L2TPv3 ethernet pseudowire driver
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*
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* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/hash.h>
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#include <linux/l2tp.h>
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#include <linux/in.h>
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#include <linux/etherdevice.h>
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#include <linux/spinlock.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/tcp_states.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include "l2tp_core.h"
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/* Default device name. May be overridden by name specified by user */
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#define L2TP_ETH_DEV_NAME "l2tpeth%d"
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/* via netdev_priv() */
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struct l2tp_eth {
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struct net_device *dev;
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struct sock *tunnel_sock;
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struct l2tp_session *session;
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struct list_head list;
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atomic_long_t tx_bytes;
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atomic_long_t tx_packets;
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atomic_long_t tx_dropped;
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atomic_long_t rx_bytes;
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atomic_long_t rx_packets;
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atomic_long_t rx_errors;
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};
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/* via l2tp_session_priv() */
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struct l2tp_eth_sess {
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struct net_device *dev;
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};
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/* per-net private data for this module */
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static unsigned int l2tp_eth_net_id;
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struct l2tp_eth_net {
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struct list_head l2tp_eth_dev_list;
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spinlock_t l2tp_eth_lock;
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};
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static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
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{
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return net_generic(net, l2tp_eth_net_id);
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}
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static struct lock_class_key l2tp_eth_tx_busylock;
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static int l2tp_eth_dev_init(struct net_device *dev)
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{
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struct l2tp_eth *priv = netdev_priv(dev);
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priv->dev = dev;
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eth_hw_addr_random(dev);
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memset(&dev->broadcast[0], 0xff, 6);
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dev->qdisc_tx_busylock = &l2tp_eth_tx_busylock;
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return 0;
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}
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static void l2tp_eth_dev_uninit(struct net_device *dev)
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{
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struct l2tp_eth *priv = netdev_priv(dev);
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struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
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spin_lock(&pn->l2tp_eth_lock);
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list_del_init(&priv->list);
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spin_unlock(&pn->l2tp_eth_lock);
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dev_put(dev);
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}
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static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct l2tp_eth *priv = netdev_priv(dev);
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struct l2tp_session *session = priv->session;
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unsigned int len = skb->len;
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int ret = l2tp_xmit_skb(session, skb, session->hdr_len);
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if (likely(ret == NET_XMIT_SUCCESS)) {
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atomic_long_add(len, &priv->tx_bytes);
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atomic_long_inc(&priv->tx_packets);
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} else {
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atomic_long_inc(&priv->tx_dropped);
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}
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return NETDEV_TX_OK;
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}
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static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct l2tp_eth *priv = netdev_priv(dev);
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stats->tx_bytes = atomic_long_read(&priv->tx_bytes);
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stats->tx_packets = atomic_long_read(&priv->tx_packets);
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stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
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stats->rx_bytes = atomic_long_read(&priv->rx_bytes);
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stats->rx_packets = atomic_long_read(&priv->rx_packets);
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stats->rx_errors = atomic_long_read(&priv->rx_errors);
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return stats;
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}
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static struct net_device_ops l2tp_eth_netdev_ops = {
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.ndo_init = l2tp_eth_dev_init,
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.ndo_uninit = l2tp_eth_dev_uninit,
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.ndo_start_xmit = l2tp_eth_dev_xmit,
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.ndo_get_stats64 = l2tp_eth_get_stats64,
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};
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static void l2tp_eth_dev_setup(struct net_device *dev)
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{
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ether_setup(dev);
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dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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dev->features |= NETIF_F_LLTX;
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dev->netdev_ops = &l2tp_eth_netdev_ops;
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dev->destructor = free_netdev;
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}
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static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
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{
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struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
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struct net_device *dev = spriv->dev;
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struct l2tp_eth *priv = netdev_priv(dev);
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if (session->debug & L2TP_MSG_DATA) {
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unsigned int length;
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length = min(32u, skb->len);
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if (!pskb_may_pull(skb, length))
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goto error;
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pr_debug("%s: eth recv\n", session->name);
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print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
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}
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if (!pskb_may_pull(skb, ETH_HLEN))
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goto error;
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secpath_reset(skb);
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/* checksums verified by L2TP */
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skb->ip_summed = CHECKSUM_NONE;
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skb_dst_drop(skb);
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nf_reset(skb);
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if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
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atomic_long_inc(&priv->rx_packets);
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atomic_long_add(data_len, &priv->rx_bytes);
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} else {
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atomic_long_inc(&priv->rx_errors);
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}
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return;
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error:
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atomic_long_inc(&priv->rx_errors);
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kfree_skb(skb);
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}
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static void l2tp_eth_delete(struct l2tp_session *session)
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{
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struct l2tp_eth_sess *spriv;
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struct net_device *dev;
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if (session) {
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spriv = l2tp_session_priv(session);
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dev = spriv->dev;
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if (dev) {
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unregister_netdev(dev);
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spriv->dev = NULL;
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module_put(THIS_MODULE);
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}
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}
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}
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#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
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static void l2tp_eth_show(struct seq_file *m, void *arg)
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{
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struct l2tp_session *session = arg;
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struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
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struct net_device *dev = spriv->dev;
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seq_printf(m, " interface %s\n", dev->name);
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}
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#endif
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static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
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{
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struct net_device *dev;
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char name[IFNAMSIZ];
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struct l2tp_tunnel *tunnel;
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struct l2tp_session *session;
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struct l2tp_eth *priv;
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struct l2tp_eth_sess *spriv;
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int rc;
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struct l2tp_eth_net *pn;
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tunnel = l2tp_tunnel_find(net, tunnel_id);
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if (!tunnel) {
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rc = -ENODEV;
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goto out;
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}
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session = l2tp_session_find(net, tunnel, session_id);
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if (session) {
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rc = -EEXIST;
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goto out;
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}
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if (cfg->ifname) {
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dev = dev_get_by_name(net, cfg->ifname);
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if (dev) {
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dev_put(dev);
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rc = -EEXIST;
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goto out;
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}
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strlcpy(name, cfg->ifname, IFNAMSIZ);
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} else
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strcpy(name, L2TP_ETH_DEV_NAME);
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session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
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peer_session_id, cfg);
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if (!session) {
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rc = -ENOMEM;
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goto out;
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}
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dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
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l2tp_eth_dev_setup);
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if (!dev) {
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rc = -ENOMEM;
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goto out_del_session;
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}
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dev_net_set(dev, net);
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if (session->mtu == 0)
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session->mtu = dev->mtu - session->hdr_len;
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dev->mtu = session->mtu;
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dev->needed_headroom += session->hdr_len;
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priv = netdev_priv(dev);
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priv->dev = dev;
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priv->session = session;
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INIT_LIST_HEAD(&priv->list);
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priv->tunnel_sock = tunnel->sock;
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session->recv_skb = l2tp_eth_dev_recv;
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session->session_close = l2tp_eth_delete;
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#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
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session->show = l2tp_eth_show;
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#endif
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spriv = l2tp_session_priv(session);
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spriv->dev = dev;
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rc = register_netdev(dev);
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if (rc < 0)
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goto out_del_dev;
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__module_get(THIS_MODULE);
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/* Must be done after register_netdev() */
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strlcpy(session->ifname, dev->name, IFNAMSIZ);
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dev_hold(dev);
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pn = l2tp_eth_pernet(dev_net(dev));
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spin_lock(&pn->l2tp_eth_lock);
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list_add(&priv->list, &pn->l2tp_eth_dev_list);
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spin_unlock(&pn->l2tp_eth_lock);
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return 0;
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out_del_dev:
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free_netdev(dev);
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spriv->dev = NULL;
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out_del_session:
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l2tp_session_delete(session);
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out:
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return rc;
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}
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static __net_init int l2tp_eth_init_net(struct net *net)
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{
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struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
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INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
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spin_lock_init(&pn->l2tp_eth_lock);
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return 0;
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}
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static struct pernet_operations l2tp_eth_net_ops = {
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.init = l2tp_eth_init_net,
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.id = &l2tp_eth_net_id,
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.size = sizeof(struct l2tp_eth_net),
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};
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static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
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.session_create = l2tp_eth_create,
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.session_delete = l2tp_session_delete,
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};
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static int __init l2tp_eth_init(void)
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{
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int err = 0;
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err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
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if (err)
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goto out;
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err = register_pernet_device(&l2tp_eth_net_ops);
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if (err)
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goto out_unreg;
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pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
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return 0;
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out_unreg:
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l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
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out:
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return err;
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}
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static void __exit l2tp_eth_exit(void)
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{
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unregister_pernet_device(&l2tp_eth_net_ops);
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l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
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}
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module_init(l2tp_eth_init);
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module_exit(l2tp_eth_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
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MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
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MODULE_VERSION("1.0");
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