1 // SPDX-License-Identifier: GPL-2.0-or-later
17 #include <net/sock.h>
50 	eth_broadcast_addr(dev->broadcast);  in l2tp_eth_dev_init()
58 	struct l2tp_eth *priv = netdev_priv(dev);  in l2tp_eth_dev_uninit()  local
61 	spriv = l2tp_session_priv(priv->session);  in l2tp_eth_dev_uninit()
62 	RCU_INIT_POINTER(spriv->dev, NULL);  in l2tp_eth_dev_uninit()
70 	struct l2tp_eth *priv = netdev_priv(dev);  in l2tp_eth_dev_xmit()  local
71 	struct l2tp_session *session = priv->session;  in l2tp_eth_dev_xmit()
72 	unsigned int len = skb->len;  in l2tp_eth_dev_xmit()
98 	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;  in l2tp_eth_dev_setup()
99 	dev->lltx		= true;  in l2tp_eth_dev_setup()
100 	dev->netdev_ops		= &l2tp_eth_netdev_ops;  in l2tp_eth_dev_setup()
101 	dev->needs_free_netdev	= true;  in l2tp_eth_dev_setup()
102 	dev->pcpu_stat_type	= NETDEV_PCPU_STAT_DSTATS;  in l2tp_eth_dev_setup()
116 	skb->ip_summed = CHECKSUM_NONE;  in l2tp_eth_dev_recv()
118 	/* drop outer flow-hash */  in l2tp_eth_dev_recv()
125 	dev = rcu_dereference(spriv->dev);  in l2tp_eth_dev_recv()
153 		dev = rtnl_dereference(spriv->dev);  in l2tp_eth_delete()
171 	dev = rcu_dereference(spriv->dev);  in l2tp_eth_show()
179 	seq_printf(m, "   interface %s\n", dev->name);  in l2tp_eth_show()
193 	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {  in l2tp_eth_adjust_mtu()
195 		dev->needed_headroom += sizeof(struct udphdr);  in l2tp_eth_adjust_mtu()
198 	lock_sock(tunnel->sock);  in l2tp_eth_adjust_mtu()
199 	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);  in l2tp_eth_adjust_mtu()
200 	release_sock(tunnel->sock);  in l2tp_eth_adjust_mtu()
204 		 * because tunnel->sock was NULL or the socket's  in l2tp_eth_adjust_mtu()
210 	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr  in l2tp_eth_adjust_mtu()
213 	overhead += session->hdr_len + ETH_HLEN + l3_overhead;  in l2tp_eth_adjust_mtu()
215 	mtu = l2tp_tunnel_dst_mtu(tunnel) - overhead;  in l2tp_eth_adjust_mtu()
216 	if (mtu < dev->min_mtu || mtu > dev->max_mtu)  in l2tp_eth_adjust_mtu()
217 		dev->mtu = ETH_DATA_LEN - overhead;  in l2tp_eth_adjust_mtu()
219 		dev->mtu = mtu;  in l2tp_eth_adjust_mtu()
221 	dev->needed_headroom += session->hdr_len;  in l2tp_eth_adjust_mtu()
232 	struct l2tp_eth *priv;  in l2tp_eth_create()  local
236 	if (cfg->ifname) {  in l2tp_eth_create()
237 		strscpy(name, cfg->ifname, IFNAMSIZ);  in l2tp_eth_create()
251 	dev = alloc_netdev(sizeof(*priv), name, name_assign_type,  in l2tp_eth_create()
254 		rc = -ENOMEM;  in l2tp_eth_create()
259 	dev->min_mtu = 0;  in l2tp_eth_create()
260 	dev->max_mtu = ETH_MAX_MTU;  in l2tp_eth_create()
263 	priv = netdev_priv(dev);  in l2tp_eth_create()
264 	priv->session = session;  in l2tp_eth_create()
266 	session->recv_skb = l2tp_eth_dev_recv;  in l2tp_eth_create()
267 	session->session_close = l2tp_eth_delete;  in l2tp_eth_create()
269 		session->show = l2tp_eth_show;  in l2tp_eth_create()
273 	refcount_inc(&session->ref_count);  in l2tp_eth_create()
279 	 * unregister, even if it happened to run before we assign spriv->dev.  in l2tp_eth_create()
297 	strscpy(session->ifname, dev->name, IFNAMSIZ);  in l2tp_eth_create()
298 	rcu_assign_pointer(spriv->dev, dev);  in l2tp_eth_create()