net/l2tp/l2tp_core.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
26 /* System-wide session hash table size */
65  * Tracks runtime state including cookies, dataplane packet sequencing, and IO statistics.
66  * Is linked into a per-tunnel session hashlist; and in the case of an L2TPv3 session into
67  * an additional per-net ("global") hashlist.
71 	int			magic;		/* should be L2TP_SESSION_MAGIC */  member
88 	u32			nr_oos;		/* NR of last OOS packet */
116 	 * out pseudowire-specific shutdown actions.
123 	 * Pseudowire-specific implementation of debugfs session rendering.
136 	/* Used only for kernel-created sockets */
154  * Is linked into a per-net list of tunnels.
158 	int			magic;		/* Should be L2TP_TUNNEL_MAGIC */  member
163 	spinlock_t		hlist_lock;	/* write-protection for session_hlist */
177 	struct list_head	list;		/* list node on per-namespace list of tunnels */
195 	 * session instance, as well as carry out any pseudowire-specific initialisation.
204 	 * It must call l2tp_session_delete, as well as carry out any pseudowire-specific
212 	return &session->priv[0];  in l2tp_session_priv()
236  * Creation of a new instance is a two-step process: create, then register.
278  * validating the tunnel magic feather.
284 	switch (session->l2specific_type) {  in l2tp_get_l2specific_len()
298 	dst = sk_dst_get(tunnel->sock);  in l2tp_tunnel_dst_mtu()
311 	struct sock *sk = tunnel->sock;  in l2tp_tunnel_uses_xfrm()
313 	return sk && (rcu_access_pointer(sk->sk_policy[0]) ||  in l2tp_tunnel_uses_xfrm()
314 		      rcu_access_pointer(sk->sk_policy[1]));  in l2tp_tunnel_uses_xfrm()
326 	int opt_len = session->peer_cookie_len + l2tp_get_l2specific_len(session);  in l2tp_v3_ensure_opt_in_linear()
329 		int off = *ptr - *optr;  in l2tp_v3_ensure_opt_in_linear()
332 			return -1;  in l2tp_v3_ensure_opt_in_linear()
334 		if (skb->data != *optr) {  in l2tp_v3_ensure_opt_in_linear()
335 			*optr = skb->data;  in l2tp_v3_ensure_opt_in_linear()
336 			*ptr = skb->data + off;  in l2tp_v3_ensure_opt_in_linear()
344 	MODULE_ALIAS("net-l2tp-type-" __stringify(type))