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Commit 3305f9a9 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'l2tp-rework-pppol2tp-ioctl-handling' 



Guillaume Nault says:

====================
l2tp: rework pppol2tp ioctl handling

The current ioctl() handling code can be simplified. It tests for
non-relevant conditions and uselessly holds sockets. Once useless
code is removed, it becomes even simpler to let pppol2tp_ioctl() handle
commands directly, rather than dispatch them to pppol2tp_tunnel_ioctl()
or pppol2tp_session_ioctl(). That is the approach taken by this series.

Patch #1 and #2 define helper functions aimed at simplifying the rest
of the patch set.

Patch #3 drops useless tests in pppol2p_ioctl() and avoid holding a
refcount on the socket.

Patches #4, #5 and #6 are the core of the series. They let
pppol2tp_ioctl() handle all ioctls and drop the tunnel and session
specific functions.

Then patch #6 brings a little bit of consolidation.

Finally, patch #7 takes advantage of the simplified code to make
pppol2tp sockets compatible with dev_ioctl(). Certainly not a killer
feature, but it is trivial and it is always nice to see l2tp getting
better integration with the rest of the stack.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 8a8982d1 4f5f85e9

include/uapi/linux/ppp-ioctl.h

+1 −1
Original line number Diff line number Diff line
@@ -68,7 +68,7 @@ struct ppp_option_data { 
struct pppol2tp_ioc_stats {

	__u16		tunnel_id;	/* redundant */

	__u16		session_id;	/* if zero, get tunnel stats */

	__u32		using_ipsec:1;	/* valid only for session_id == 0 */

	__u32		using_ipsec:1;

	__aligned_u64	tx_packets;

	__aligned_u64	tx_bytes;

	__aligned_u64	tx_errors;

net/l2tp/l2tp_core.c

+25 −25
Original line number Diff line number Diff line
@@ -203,44 +203,44 @@ struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth) 
}

EXPORT_SYMBOL_GPL(l2tp_tunnel_get_nth);



/* 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,

struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,

					     u32 session_id)

{

	struct hlist_head *session_list;

	struct l2tp_session *session;



	if (!tunnel) {

		struct l2tp_net *pn = l2tp_pernet(net);



		session_list = l2tp_session_id_hash_2(pn, session_id);

	session_list = l2tp_session_id_hash(tunnel, session_id);



		rcu_read_lock_bh();

		hlist_for_each_entry_rcu(session, session_list, global_hlist) {

	read_lock_bh(&tunnel->hlist_lock);

	hlist_for_each_entry(session, session_list, hlist)

		if (session->session_id == session_id) {

			l2tp_session_inc_refcount(session);

				rcu_read_unlock_bh();

			read_unlock_bh(&tunnel->hlist_lock);



			return session;

		}

		}

		rcu_read_unlock_bh();

	read_unlock_bh(&tunnel->hlist_lock);



	return NULL;

}

EXPORT_SYMBOL_GPL(l2tp_tunnel_get_session);



	session_list = l2tp_session_id_hash(tunnel, session_id);

	read_lock_bh(&tunnel->hlist_lock);

	hlist_for_each_entry(session, session_list, hlist) {

struct l2tp_session *l2tp_session_get(const struct net *net, u32 session_id)

{

	struct hlist_head *session_list;

	struct l2tp_session *session;



	session_list = l2tp_session_id_hash_2(l2tp_pernet(net), session_id);



	rcu_read_lock_bh();

	hlist_for_each_entry_rcu(session, session_list, global_hlist)

		if (session->session_id == session_id) {

			l2tp_session_inc_refcount(session);

			read_unlock_bh(&tunnel->hlist_lock);

			rcu_read_unlock_bh();



			return session;

		}

	}

	read_unlock_bh(&tunnel->hlist_lock);

	rcu_read_unlock_bh();



	return NULL;

}
@@ -872,7 +872,7 @@ 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);

	session = l2tp_tunnel_get_session(tunnel, session_id);

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

		if (session)

			l2tp_session_dec_refcount(session);

net/l2tp/l2tp_core.h

+22 −3
Original line number Diff line number Diff line
@@ -15,6 +15,10 @@ 
#include <net/dst.h>

#include <net/sock.h>



#ifdef CONFIG_XFRM

#include <net/xfrm.h>

#endif



/* Just some random numbers */

#define L2TP_TUNNEL_MAGIC	0x42114DDA

#define L2TP_SESSION_MAGIC	0x0C04EB7D
@@ -192,12 +196,12 @@ static inline void *l2tp_session_priv(struct l2tp_session *session) 


struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);

struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);

struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,

					     u32 session_id);



void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);



struct l2tp_session *l2tp_session_get(const struct net *net,

				      struct l2tp_tunnel *tunnel,

				      u32 session_id);

struct l2tp_session *l2tp_session_get(const struct net *net, 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);
@@ -284,6 +288,21 @@ static inline u32 l2tp_tunnel_dst_mtu(const struct l2tp_tunnel *tunnel) 
	return mtu;

}



#ifdef CONFIG_XFRM

static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)

{

	struct sock *sk = tunnel->sock;



	return sk && (rcu_access_pointer(sk->sk_policy[0]) ||

		      rcu_access_pointer(sk->sk_policy[1]));

}

#else

static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)

{

	return false;

}

#endif



#define l2tp_printk(ptr, type, func, fmt, ...)				\

do {									\

	if (((ptr)->debug) & (type))					\

net/l2tp/l2tp_ip.c

+1 −1
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ 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);

	session = l2tp_session_get(net, session_id);

	if (!session)

		goto discard;

net/l2tp/l2tp_ip6.c

+1 −1
Original line number Diff line number Diff line
@@ -157,7 +157,7 @@ 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);

	session = l2tp_session_get(net, session_id);

	if (!session)

		goto discard;