1 // SPDX-License-Identifier: GPL-2.0-or-later
17 #include <net/sock.h>
51 	eth_broadcast_addr(dev->broadcast);  in l2tp_eth_dev_init()
59 	struct l2tp_eth *priv = netdev_priv(dev);  in l2tp_eth_dev_uninit()  local
62 	spriv = l2tp_session_priv(priv->session);  in l2tp_eth_dev_uninit()
63 	RCU_INIT_POINTER(spriv->dev, NULL);  in l2tp_eth_dev_uninit()
71 	struct l2tp_eth *priv = netdev_priv(dev);  in l2tp_eth_dev_xmit()  local
72 	struct l2tp_session *session = priv->session;  in l2tp_eth_dev_xmit()
73 	unsigned int len = skb->len;  in l2tp_eth_dev_xmit()
99 	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;  in l2tp_eth_dev_setup()
100 	dev->lltx		= true;  in l2tp_eth_dev_setup()
101 	dev->netdev_ops		= &l2tp_eth_netdev_ops;  in l2tp_eth_dev_setup()
102 	dev->needs_free_netdev	= true;  in l2tp_eth_dev_setup()
103 	dev->pcpu_stat_type	= NETDEV_PCPU_STAT_DSTATS;  in l2tp_eth_dev_setup()
117 	skb->ip_summed = CHECKSUM_NONE;  in l2tp_eth_dev_recv()
119 	/* drop outer flow-hash */  in l2tp_eth_dev_recv()
126 	dev = rcu_dereference(spriv->dev);  in l2tp_eth_dev_recv()
154 		dev = rtnl_dereference(spriv->dev);  in l2tp_eth_delete()
172 	dev = rcu_dereference(spriv->dev);  in l2tp_eth_show()
180 	seq_printf(m, "   interface %s\n", dev->name);  in l2tp_eth_show()
194 	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {  in l2tp_eth_adjust_mtu()
196 		dev->needed_headroom += sizeof(struct udphdr);  in l2tp_eth_adjust_mtu()
199 	lock_sock(tunnel->sock);  in l2tp_eth_adjust_mtu()
200 	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);  in l2tp_eth_adjust_mtu()
201 	release_sock(tunnel->sock);  in l2tp_eth_adjust_mtu()
205 		 * because tunnel->sock was NULL or the socket's  in l2tp_eth_adjust_mtu()
211 	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr  in l2tp_eth_adjust_mtu()
214 	overhead += session->hdr_len + ETH_HLEN + l3_overhead;  in l2tp_eth_adjust_mtu()
216 	mtu = l2tp_tunnel_dst_mtu(tunnel) - overhead;  in l2tp_eth_adjust_mtu()
217 	if (mtu < dev->min_mtu || mtu > dev->max_mtu)  in l2tp_eth_adjust_mtu()
218 		dev->mtu = ETH_DATA_LEN - overhead;  in l2tp_eth_adjust_mtu()
220 		dev->mtu = mtu;  in l2tp_eth_adjust_mtu()
222 	dev->needed_headroom += session->hdr_len;  in l2tp_eth_adjust_mtu()
233 	struct l2tp_eth *priv;  in l2tp_eth_create()  local
237 	if (cfg->ifname) {  in l2tp_eth_create()
238 		strscpy(name, cfg->ifname, IFNAMSIZ);  in l2tp_eth_create()
252 	dev = alloc_netdev(sizeof(*priv), name, name_assign_type,  in l2tp_eth_create()
255 		rc = -ENOMEM;  in l2tp_eth_create()
260 	dev->min_mtu = 0;  in l2tp_eth_create()
261 	dev->max_mtu = ETH_MAX_MTU;  in l2tp_eth_create()
264 	priv = netdev_priv(dev);  in l2tp_eth_create()
265 	priv->session = session;  in l2tp_eth_create()
267 	session->recv_skb = l2tp_eth_dev_recv;  in l2tp_eth_create()
268 	session->session_close = l2tp_eth_delete;  in l2tp_eth_create()
270 		session->show = l2tp_eth_show;  in l2tp_eth_create()
274 	refcount_inc(&session->ref_count);  in l2tp_eth_create()
280 	 * unregister, even if it happened to run before we assign spriv->dev.  in l2tp_eth_create()
298 	strscpy(session->ifname, dev->name, IFNAMSIZ);  in l2tp_eth_create()
299 	rcu_assign_pointer(spriv->dev, dev);  in l2tp_eth_create()