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Commit a4346210 authored by Guillaume Nault's avatar Guillaume Nault Committed by David S. Miller
Browse files

l2tp: remove ->ref() and ->deref() 



The ->ref() and ->deref() callbacks are unused since PPP stopped using
them in ee40fb2e ("l2tp: protect sock pointer of struct pppol2tp_session with RCU").

We can thus remove them from struct l2tp_session and drop the do_ref
parameter of l2tp_session_get*().

Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa2bc739

net/l2tp/l2tp_core.c

+8 −44
Original line number Diff line number Diff line
@@ -216,12 +216,10 @@ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id) 
}

EXPORT_SYMBOL_GPL(l2tp_tunnel_get);



/* Lookup a session. A new reference is held on the returned session.

 * Optionally calls session->ref() too if do_ref is true.

 */

/* Lookup a session. A new reference is held on the returned session. */

struct l2tp_session *l2tp_session_get(const struct net *net,

				      struct l2tp_tunnel *tunnel,

				      u32 session_id, bool do_ref)

				      u32 session_id)

{

	struct hlist_head *session_list;

	struct l2tp_session *session;
@@ -235,8 +233,6 @@ struct l2tp_session *l2tp_session_get(const struct net *net, 
		hlist_for_each_entry_rcu(session, session_list, global_hlist) {

			if (session->session_id == session_id) {

				l2tp_session_inc_refcount(session);

				if (do_ref && session->ref)

					session->ref(session);

				rcu_read_unlock_bh();



				return session;
@@ -252,8 +248,6 @@ struct l2tp_session *l2tp_session_get(const struct net *net, 
	hlist_for_each_entry(session, session_list, hlist) {

		if (session->session_id == session_id) {

			l2tp_session_inc_refcount(session);

			if (do_ref && session->ref)

				session->ref(session);

			read_unlock_bh(&tunnel->hlist_lock);



			return session;
@@ -265,8 +259,7 @@ struct l2tp_session *l2tp_session_get(const struct net *net, 
}

EXPORT_SYMBOL_GPL(l2tp_session_get);



struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth,

					  bool do_ref)

struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth)

{

	int hash;

	struct l2tp_session *session;
@@ -277,8 +270,6 @@ struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, 
		hlist_for_each_entry(session, &tunnel->session_hlist[hash], hlist) {

			if (++count > nth) {

				l2tp_session_inc_refcount(session);

				if (do_ref && session->ref)

					session->ref(session);

				read_unlock_bh(&tunnel->hlist_lock);

				return session;

			}
@@ -295,8 +286,7 @@ EXPORT_SYMBOL_GPL(l2tp_session_get_nth); 
 * This is very inefficient but is only used by management interfaces.

 */

struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,

						const char *ifname,

						bool do_ref)

						const char *ifname)

{

	struct l2tp_net *pn = l2tp_pernet(net);

	int hash;
@@ -307,8 +297,6 @@ struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, 
		hlist_for_each_entry_rcu(session, &pn->l2tp_session_hlist[hash], global_hlist) {

			if (!strcmp(session->ifname, ifname)) {

				l2tp_session_inc_refcount(session);

				if (do_ref && session->ref)

					session->ref(session);

				rcu_read_unlock_bh();



				return session;
@@ -489,9 +477,6 @@ static void l2tp_recv_dequeue_skb(struct l2tp_session *session, struct sk_buff * 
		(*session->recv_skb)(session, skb, L2TP_SKB_CB(skb)->length);

	else

		kfree_skb(skb);



	if (session->deref)

		(*session->deref)(session);

}



/* Dequeue skbs from the session's reorder_q, subject to packet order.
@@ -520,8 +505,6 @@ static void l2tp_recv_dequeue(struct l2tp_session *session) 
			session->reorder_skip = 1;

			__skb_unlink(skb, &session->reorder_q);

			kfree_skb(skb);

			if (session->deref)

				(*session->deref)(session);

			continue;

		}
@@ -694,9 +677,6 @@ static int l2tp_recv_data_seq(struct l2tp_session *session, struct sk_buff *skb) 
 * a data (not control) frame before coming here. Fields up to the

 * session-id have already been parsed and ptr points to the data

 * after the session-id.

 *

 * session->ref() must have been called prior to l2tp_recv_common().

 * session->deref() will be called automatically after skb is processed.

 */

void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,

		      unsigned char *ptr, unsigned char *optr, u16 hdrflags,
@@ -863,9 +843,6 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, 
discard:

	atomic_long_inc(&session->stats.rx_errors);

	kfree_skb(skb);



	if (session->deref)

		(*session->deref)(session);

}

EXPORT_SYMBOL(l2tp_recv_common);
@@ -879,8 +856,6 @@ int l2tp_session_queue_purge(struct l2tp_session *session) 
	while ((skb = skb_dequeue(&session->reorder_q))) {

		atomic_long_inc(&session->stats.rx_errors);

		kfree_skb(skb);

		if (session->deref)

			(*session->deref)(session);

	}

	return 0;

}
@@ -972,13 +947,10 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, 
	}



	/* Find the session context */

	session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id, true);

	session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id);

	if (!session || !session->recv_skb) {

		if (session) {

			if (session->deref)

				session->deref(session);

		if (session)

			l2tp_session_dec_refcount(session);

		}



		/* Not found? Pass to userspace to deal with */

		l2tp_info(tunnel, L2TP_MSG_DATA,
@@ -1322,9 +1294,6 @@ void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel) 
			if (test_and_set_bit(0, &session->dead))

				goto again;



			if (session->ref != NULL)

				(*session->ref)(session);



			write_unlock_bh(&tunnel->hlist_lock);



			__l2tp_session_unhash(session);
@@ -1333,9 +1302,6 @@ void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel) 
			if (session->session_close != NULL)

				(*session->session_close)(session);



			if (session->deref != NULL)

				(*session->deref)(session);



			l2tp_session_dec_refcount(session);



			write_lock_bh(&tunnel->hlist_lock);
@@ -1759,15 +1725,13 @@ int l2tp_session_delete(struct l2tp_session *session) 
	if (test_and_set_bit(0, &session->dead))

		return 0;



	if (session->ref)

		(*session->ref)(session);

	__l2tp_session_unhash(session);

	l2tp_session_queue_purge(session);

	if (session->session_close != NULL)

		(*session->session_close)(session);

	if (session->deref)

		(*session->deref)(session);



	l2tp_session_dec_refcount(session);



	return 0;

}

EXPORT_SYMBOL_GPL(l2tp_session_delete);

net/l2tp/l2tp_core.h

+3 −7
Original line number Diff line number Diff line
@@ -129,8 +129,6 @@ struct l2tp_session { 
	int (*build_header)(struct l2tp_session *session, void *buf);

	void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);

	void (*session_close)(struct l2tp_session *session);

	void (*ref)(struct l2tp_session *session);

	void (*deref)(struct l2tp_session *session);

#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)

	void (*show)(struct seq_file *m, void *priv);

#endif
@@ -245,12 +243,10 @@ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id); 


struct l2tp_session *l2tp_session_get(const struct net *net,

				      struct l2tp_tunnel *tunnel,

				      u32 session_id, bool do_ref);

struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth,

					  bool do_ref);

				      u32 session_id);

struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);

struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,

						const char *ifname,

						bool do_ref);

						const char *ifname);

struct l2tp_tunnel *l2tp_tunnel_find(const struct net *net, u32 tunnel_id);

struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth);

net/l2tp/l2tp_debugfs.c

+1 −3
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd) 


static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)

{

	pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);

	pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);

	pd->session_idx++;



	if (pd->session == NULL) {
@@ -241,8 +241,6 @@ static int l2tp_dfs_seq_show(struct seq_file *m, void *v) 
		l2tp_dfs_seq_tunnel_show(m, pd->tunnel);

	} else {

		l2tp_dfs_seq_session_show(m, pd->session);

		if (pd->session->deref)

			pd->session->deref(pd->session);

		l2tp_session_dec_refcount(pd->session);

	}

net/l2tp/l2tp_ip.c

+1 −3
Original line number Diff line number Diff line
@@ -143,7 +143,7 @@ static int l2tp_ip_recv(struct sk_buff *skb) 
	}



	/* Ok, this is a data packet. Lookup the session. */

	session = l2tp_session_get(net, NULL, session_id, true);

	session = l2tp_session_get(net, NULL, session_id);

	if (!session)

		goto discard;
@@ -205,8 +205,6 @@ static int l2tp_ip_recv(struct sk_buff *skb) 
	return sk_receive_skb(sk, skb, 1);



discard_sess:

	if (session->deref)

		session->deref(session);

	l2tp_session_dec_refcount(session);

	goto discard;

net/l2tp/l2tp_ip6.c

+1 −3
Original line number Diff line number Diff line
@@ -156,7 +156,7 @@ static int l2tp_ip6_recv(struct sk_buff *skb) 
	}



	/* Ok, this is a data packet. Lookup the session. */

	session = l2tp_session_get(net, NULL, session_id, true);

	session = l2tp_session_get(net, NULL, session_id);

	if (!session)

		goto discard;
@@ -219,8 +219,6 @@ static int l2tp_ip6_recv(struct sk_buff *skb) 
	return sk_receive_skb(sk, skb, 1);



discard_sess:

	if (session->deref)

		session->deref(session);

	l2tp_session_dec_refcount(session);

	goto discard;