Re: [PATCH -v2 07/12] Bluetooth: Create DEFER_SETUP flag in conf_state

[Gustavo Padovan <gustavo@padovan.org>]

Hi Marcel,

* Marcel Holtmann <marcel@holtmann.org> [2012-05-28 05:48:48 +0200]:

> Hi Gustavo,
> 
> > > > Remove another socket usage from l2cap_core.c
> > > > 
> > > > Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> > > > ---
> > > >  include/net/bluetooth/l2cap.h |    1 +
> > > >  net/bluetooth/l2cap_core.c    |   12 ++++++------
> > > >  net/bluetooth/l2cap_sock.c    |    8 ++++++--
> > > >  3 files changed, 13 insertions(+), 8 deletions(-)
> > > > 
> > > > diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
> > > > index 3b05f3e..c55b28f 100644
> > > > --- a/include/net/bluetooth/l2cap.h
> > > > +++ b/include/net/bluetooth/l2cap.h
> > > > @@ -599,6 +599,7 @@ enum {
> > > >  	CONF_LOC_CONF_PEND,
> > > >  	CONF_REM_CONF_PEND,
> > > >  	CONF_NOT_COMPLETE,
> > > > +	CONF_DEFER_SETUP,
> > > >  };
> > > >  
> > > >  #define L2CAP_CONF_MAX_CONF_REQ 2
> > > > diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> > > > index 01171b1..388bc70 100644
> > > > --- a/net/bluetooth/l2cap_core.c
> > > > +++ b/net/bluetooth/l2cap_core.c
> > > > @@ -569,7 +569,7 @@ void l2cap_chan_close(struct l2cap_chan *chan, int reason)
> > > >  			struct l2cap_conn_rsp rsp;
> > > >  			__u16 result;
> > > >  
> > > > -			if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
> > > > +			if (test_bit(CONF_DEFER_SETUP, &chan->conf_state))
> > > >  				result = L2CAP_CR_SEC_BLOCK;
> > > >  			else
> > > >  				result = L2CAP_CR_BAD_PSM;
> > > > @@ -1056,8 +1056,8 @@ static void l2cap_conn_start(struct l2cap_conn *conn)
> > > >  
> > > >  			if (l2cap_chan_check_security(chan)) {
> > > >  				lock_sock(sk);
> > > > -				if (test_bit(BT_SK_DEFER_SETUP,
> > > > -					     &bt_sk(sk)->flags)) {
> > > > +				if (test_bit(CONF_DEFER_SETUP,
> > > > +					     &chan->conf_state)) {
> > > >  					struct sock *parent = bt_sk(sk)->parent;
> > > >  					rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
> > > >  					rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
> > > > @@ -3376,7 +3376,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
> > > >  
> > > >  	if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
> > > >  		if (l2cap_chan_check_security(chan)) {
> > > > -			if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
> > > > +			if (test_bit(CONF_DEFER_SETUP, &chan->conf_state)) {
> > > >  				__l2cap_state_change(chan, BT_CONNECT2);
> > > >  				result = L2CAP_CR_PEND;
> > > >  				status = L2CAP_CS_AUTHOR_PEND;
> > > > @@ -5406,8 +5406,8 @@ int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
> > > >  			lock_sock(sk);
> > > >  
> > > >  			if (!status) {
> > > > -				if (test_bit(BT_SK_DEFER_SETUP,
> > > > -					     &bt_sk(sk)->flags)) {
> > > > +				if (test_bit(CONF_DEFER_SETUP,
> > > > +					     &chan->conf_state)) {
> > > >  					struct sock *parent = bt_sk(sk)->parent;
> > > >  					res = L2CAP_CR_PEND;
> > > >  					stat = L2CAP_CS_AUTHOR_PEND;
> > > > diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
> > > > index d2d91b3..51d05a7 100644
> > > > --- a/net/bluetooth/l2cap_sock.c
> > > > +++ b/net/bluetooth/l2cap_sock.c
> > > > @@ -623,10 +623,14 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, ch
> > > >  			break;
> > > >  		}
> > > >  
> > > > -		if (opt)
> > > > +		if (opt) {
> > > >  			set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
> > > > -		else
> > > > +			set_bit(CONF_DEFER_SETUP, &chan->conf_state);
> > > > +		} else {
> > > >  			clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
> > > > +			clear_bit(CONF_DEFER_SETUP, &chan->conf_state);
> > > > +		}
> > > > +
> > > >  		break;
> > > 
> > > and what about the lines above testing this together with BT_SECURITY?
> > 
> > I'm ok with those lines using BT_SK_DEFER_SETUP. CONF_DEFER_SETUP is meant for
> > l2cap_core.c use where we should not have access to sk.
> 
> I am not since it is more states we have to keep in sync. That is a bad
> idea. What is the real plan here?

The plan is to remove the use of bt_sk(sk)->flags from l2cap_core.c and the
only idea I had until now was coping the DEFER_SETUP bit to chan->conf_state
flags, however after the copy we can't remove this flags from bt_sk(sk) since
it is used is socket specific doe too.

	Gustavo