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path: root/net/bluetooth/l2cap.c
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2009-02-27Bluetooth: Remove some pointless conditionals before kfree_skb()Wei Yongjun
Remove some pointless conditionals before kfree_skb(). Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Permit BT_SECURITY also for L2CAP raw socketsMarcel Holtmann
Userspace pairing code can be simplified if it doesn't have to fall back to using L2CAP_LM in the case of L2CAP raw sockets. This patch allows the BT_SECURITY socket option to be used for these sockets. Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Disallow usage of L2CAP CID setting for nowMarcel Holtmann
In the future the L2CAP layer will have full support for fixed channels and right now it already can export the channel assignment, but for the functions bind() and connect() the usage of only CID 0 is allowed. This allows an easy detection if the kernel supports fixed channels or not, because otherwise it would impossible for application to tell. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Fix authentication requirements for L2CAP security checkMarcel Holtmann
The L2CAP layer can trigger the authentication via an ACL connection or later on to increase the security level. When increasing the security level it didn't use the same authentication requirements when triggering a new ACL connection. Make sure that exactly the same authentication requirements are used. The only exception here are the L2CAP raw sockets which are only used for dedicated bonding. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Ask upper layers for HCI disconnect reasonMarcel Holtmann
Some of the qualification tests demand that in case of failures in L2CAP the HCI disconnect should indicate a reason why L2CAP fails. This is a bluntly layer violation since multiple L2CAP connections could be using the same ACL and thus forcing a disconnect reason is not a good idea. To comply with the Bluetooth test specification, the disconnect reason is now stored in the L2CAP connection structure and every time a new L2CAP channel is added it will set back to its default. So only in the case where the L2CAP channel with the disconnect reason is really the last one, it will propagated to the HCI layer. The HCI layer has been extended with a disconnect indication that allows it to ask upper layers for a disconnect reason. The upper layer must not support this callback and in that case it will nicely default to the existing behavior. If an upper layer like L2CAP can provide a disconnect reason that one will be used to disconnect the ACL or SCO link. No modification to the ACL disconnect timeout have been made. So in case of Linux to Linux connection the initiator will disconnect the ACL link before the acceptor side can signal the specific disconnect reason. That is perfectly fine since Linux doesn't make use of this value anyway. The L2CAP layer has a perfect valid error code for rejecting connection due to a security violation. It is unclear why the Bluetooth specification insists on having specific HCI disconnect reason. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Add CID field to L2CAP socket address structureMarcel Holtmann
In preparation for L2CAP fixed channel support, the CID value of a L2CAP connection needs to be accessible via the socket interface. The CID is the connection identifier and exists as source and destination value. So extend the L2CAP socket address structure with this field and change getsockname() and getpeername() to fill it in. The bind() and connect() functions have been modified to handle L2CAP socket address structures of variable sizes. This makes them future proof if additional fields need to be added. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Request L2CAP fixed channel list if availableMarcel Holtmann
If the extended features mask indicates support for fixed channels, request the list of available fixed channels. This also enables the fixed channel features bit so remote implementations can request information about it. Currently only the signal channel will be listed. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Don't enforce authentication for L2CAP PSM 1 and 3Marcel Holtmann
The recommendation for the L2CAP PSM 1 (SDP) is to not use any kind of authentication or encryption. So don't trigger authentication for incoming and outgoing SDP connections. For L2CAP PSM 3 (RFCOMM) there is no clear requirement, but with Bluetooth 2.1 the initiator is required to enable authentication and encryption first and this gets enforced. So there is no need to trigger an additional authentication step. The RFCOMM service security will make sure that a secure enough link key is present. When the encryption gets enabled after the SDP connection setup, then switch the security level from SDP to low security. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Fix double L2CAP connection requestMarcel Holtmann
If the remote L2CAP server uses authentication pending stage and encryption is enabled it can happen that a L2CAP connection request is sent twice due to a race condition in the connection state machine. When the remote side indicates any kind of connection pending, then track this state and skip sending of L2CAP commands for this period. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Fix race condition with L2CAP information requestMarcel Holtmann
When two L2CAP connections are requested quickly after the ACL link has been established there exists a window for a race condition where a connection request is sent before the information response has been received. Any connection request should only be sent after an exchange of the extended features mask has been finished. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Use general bonding whenever possibleMarcel Holtmann
When receiving incoming connection to specific services, always use general bonding. This ensures that the link key gets stored and can be used for further authentications. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Don't check encryption for L2CAP raw socketsMarcel Holtmann
For L2CAP sockets with medium and high security requirement a missing encryption will enforce the closing of the link. For the L2CAP raw sockets this is not needed, so skip that check. This fixes a crash when pairing Bluetooth 2.0 (and earlier) devices since the L2CAP state machine got confused and then locked up the whole system. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Update version numbersMarcel Holtmann
With the support for the enhanced security model and the support for deferring connection setup, it is a good idea to increase various version numbers. This is purely cosmetic and has no effect on the behavior, but can be really helpful when debugging problems in different kernel versions. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Restrict application of socket optionsMarcel Holtmann
The new socket options should only be evaluated for SOL_BLUETOOTH level and not for every other level. Previously this causes some minor issues when detecting if a kernel with certain features is available. Also restrict BT_SECURITY to SOCK_SEQPACKET for L2CAP and SOCK_STREAM for the RFCOMM protocol. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Disconnect L2CAP connections without encryptionMarcel Holtmann
For L2CAP connections with high security setting, the link will be immediately dropped when the encryption gets disabled. For L2CAP connections with medium security there will be grace period where the remote device has the chance to re-enable encryption. If it doesn't happen then the link will also be disconnected. The requirement for the grace period with medium security comes from Bluetooth 2.0 and earlier devices that require role switching. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Replace L2CAP link mode with security levelMarcel Holtmann
Change the L2CAP internals to use the new security levels and remove the link mode details. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Add enhanced security model for Simple PairingMarcel Holtmann
The current security model is based around the flags AUTH, ENCRYPT and SECURE. Starting with support for the Bluetooth 2.1 specification this is no longer sufficient. The different security levels are now defined as SDP, LOW, MEDIUM and SECURE. Previously it was possible to set each security independently, but this actually doesn't make a lot of sense. For Bluetooth the encryption depends on a previous successful authentication. Also you can only update your existing link key if you successfully created at least one before. And of course the update of link keys without having proper encryption in place is a security issue. The new security levels from the Bluetooth 2.1 specification are now used internally. All old settings are mapped to the new values and this way it ensures that old applications still work. The only limitation is that it is no longer possible to set authentication without also enabling encryption. No application should have done this anyway since this is actually a security issue. Without encryption the integrity of the authentication can't be guaranteed. As default for a new L2CAP or RFCOMM connection, the LOW security level is used. The only exception here are the service discovery sessions on PSM 1 where SDP level is used. To have similar security strength as with a Bluetooth 2.0 and before combination key, the MEDIUM level should be used. This is according to the Bluetooth specification. The MEDIUM level will not require any kind of man-in-the-middle (MITM) protection. Only the HIGH security level will require this. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Add support for deferring L2CAP connection setupMarcel Holtmann
In order to decide if listening L2CAP sockets should be accept()ed the BD_ADDR of the remote device needs to be known. This patch adds a socket option which defines a timeout for deferring the actual connection setup. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2009-02-27Bluetooth: Preparation for usage of SOL_BLUETOOTHMarcel Holtmann
The socket option levels SOL_L2CAP, SOL_RFOMM and SOL_SCO are currently in use by various Bluetooth applications. Going forward the common option level SOL_BLUETOOTH should be used. This patch prepares the clean split of the old and new option levels while keeping everything backward compatibility. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-11-30Bluetooth: Enable per-module dynamic debug messagesMarcel Holtmann
With the introduction of CONFIG_DYNAMIC_PRINTK_DEBUG it is possible to allow debugging without having to recompile the kernel. This patch turns all BT_DBG() calls into pr_debug() to support dynamic debug messages. As a side effect all CONFIG_BT_*_DEBUG statements are now removed and some broken debug entries have been fixed. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-09-09[Bluetooth] Reject L2CAP connections on an insecure ACL linkMarcel Holtmann
The Security Mode 4 of the Bluetooth 2.1 specification has strict authentication and encryption requirements. It is the initiators job to create a secure ACL link. However in case of malicious devices, the acceptor has to make sure that the ACL is encrypted before allowing any kind of L2CAP connection. The only exception here is the PSM 1 for the service discovery protocol, because that is allowed to run on an insecure ACL link. Previously it was enough to reject a L2CAP connection during the connection setup phase, but with Bluetooth 2.1 it is forbidden to do any L2CAP protocol exchange on an insecure link (except SDP). The new hci_conn_check_link_mode() function can be used to check the integrity of an ACL link. This functions also takes care of the cases where Security Mode 4 is disabled or one of the devices is based on an older specification. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-09-09[Bluetooth] Enforce correct authentication requirementsMarcel Holtmann
With the introduction of Security Mode 4 and Simple Pairing from the Bluetooth 2.1 specification it became mandatory that the initiator requires authentication and encryption before any L2CAP channel can be established. The only exception here is PSM 1 for the service discovery protocol (SDP). It is meant to be used without any encryption since it contains only public information. This is how Bluetooth 2.0 and before handle connections on PSM 1. For Bluetooth 2.1 devices the pairing procedure differentiates between no bonding, general bonding and dedicated bonding. The L2CAP layer wrongly uses always general bonding when creating new connections, but it should not do this for SDP connections. In this case the authentication requirement should be no bonding and the just-works model should be used, but in case of non-SDP connection it is required to use general bonding. If the new connection requires man-in-the-middle (MITM) protection, it also first wrongly creates an unauthenticated link key and then later on requests an upgrade to an authenticated link key to provide full MITM protection. With Simple Pairing the link key generation is an expensive operation (compared to Bluetooth 2.0 and before) and doing this twice during a connection setup causes a noticeable delay when establishing a new connection. This should be avoided to not regress from the expected Bluetooth 2.0 connection times. The authentication requirements are known up-front and so enforce them. To fulfill these requirements the hci_connect() function has been extended with an authentication requirement parameter that will be stored inside the connection information and can be retrieved by userspace at any time. This allows the correct IO capabilities exchange and results in the expected behavior. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-08-18[Bluetooth] Consolidate maintainers informationMarcel Holtmann
The Bluetooth entries for the MAINTAINERS file are a little bit too much. Consolidate them into two entries. One for Bluetooth drivers and another one for the Bluetooth subsystem. Also the MODULE_AUTHOR should indicate the current maintainer of the module and actually not the original author. Fix all Bluetooth modules to provide current maintainer information. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-07-14[Bluetooth] Allow security for outgoing L2CAP connectionsMarcel Holtmann
When requested the L2CAP layer will now enforce authentication and encryption on outgoing connections. The usefulness of this feature is kinda limited since it will not allow proper connection ownership tracking until the authentication procedure has been finished. This is a limitation of Bluetooth 2.0 and before and can only be fixed by using Simple Pairing. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-07-14[Bluetooth] Add timestamp support to L2CAP, RFCOMM and SCOMarcel Holtmann
Enable the common timestamp functionality that the network subsystem provides for L2CAP, RFCOMM and SCO sockets. It is possible to either use SO_TIMESTAMP or the IOCTLs to retrieve the timestamp of the current packet. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-07-14[Bluetooth] Export details about authentication requirementsMarcel Holtmann
With the Simple Pairing support, the authentication requirements are an explicit setting during the bonding process. Track and enforce the requirements and allow higher layers like L2CAP and RFCOMM to increase them if needed. This patch introduces a new IOCTL that allows to query the current authentication requirements. It is also possible to detect Simple Pairing support in the kernel this way. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-07-14[Bluetooth] Disconnect when encryption gets disabledMarcel Holtmann
The Bluetooth specification allows to enable or disable the encryption of an ACL link at any time by either the peer or the remote device. If a L2CAP or RFCOMM connection requested an encrypted link, they will now disconnect that link if the encryption gets disabled. Higher protocols that don't care about encryption (like SDP) are not affected. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-07-14[Bluetooth] Change retrieval of L2CAP features maskMarcel Holtmann
Getting the remote L2CAP features mask is really important, but doing this as less intrusive as possible is tricky. To play nice with older systems and Bluetooth qualification testing, the features mask is now only retrieved in two specific cases and only once per lifetime of an ACL link. When trying to establish a L2CAP connection and the remote features mask is unknown, the L2CAP information request is sent when the ACL link goes into connected state. This applies only to outgoing connections and also only for the connection oriented channels. The second case is when a connection request has been received. In this case a connection response with the result pending and the information request will be send. After receiving an information response or if the timeout gets triggered, the normal connection setup process with security setup will be initiated. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-05-02bluetooth: use get/put_unaligned_* helpersHarvey Harrison
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-02Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/s2io.c
2008-03-28bluetooth: replace deprecated RW_LOCK_UNLOCKED macrosRobert P. J. Day
The older RW_LOCK_UNLOCKED macros defeat lockdep state tracing so replace them with the newer __RW_LOCK_UNLOCKED macros. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.YOSHIFUJI Hideaki
Introduce per-sock inlines: sock_net(), sock_net_set() and per-inet_timewait_sock inlines: twsk_net(), twsk_net_set(). Without CONFIG_NET_NS, no namespace other than &init_net exists. Let's explicitly define them to help compiler optimizations. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
2008-03-03[BLUETOOTH]: l2cap info_timer delete fix in hci_conn_delDave Young
When the l2cap info_timer is active the info_state will be set to L2CAP_INFO_FEAT_MASK_REQ_SENT, and it will be unset after the timer is deleted or timeout triggered. Here in l2cap_conn_del only call del_timer_sync when the info_state is set to L2CAP_INFO_FEAT_MASK_REQ_SENT. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-26bluetooth: delete timer in l2cap_conn_del()Thomas Gleixner
Delete a possibly armed timer before kfree'ing the connection object. Solves: http://lkml.org/lkml/2008/2/15/514 Reported-by:Quel Qun <kelk1@comcast.net> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET]: Convert init_timer into setup_timerPavel Emelyanov
Many-many code in the kernel initialized the timer->function and timer->data together with calling init_timer(timer). There is already a helper for this. Use it for networking code. The patch is HUGE, but makes the code 130 lines shorter (98 insertions(+), 228 deletions(-)). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-11-01[NET]: Forget the zero_it argument of sk_alloc()Pavel Emelyanov
Finally, the zero_it argument can be completely removed from the callers and from the function prototype. Besides, fix the checkpatch.pl warnings about using the assignments inside if-s. This patch is rather big, and it is a part of the previous one. I splitted it wishing to make the patches more readable. Hope this particular split helped. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-22[Bluetooth] Fall back to L2CAP in basic modeMarcel Holtmann
In case the remote entity tries to negogiate retransmission or flow control mode, reject it and fall back to basic mode. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-10-22[Bluetooth] Advertise L2CAP features mask supportMarcel Holtmann
Indicate the support for the L2CAP features mask value when the remote entity tries to negotiate Bluetooth 1.2 specific features. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-10-22[Bluetooth] Retrieve L2CAP features mask on connection setupMarcel Holtmann
The Bluetooth 1.2 specification introduced a specific features mask value to interoperate with newer versions of the specification. So far this piece of information was never needed, but future extensions will rely on it. This patch adds a generic way to retrieve this information only once per connection setup. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-10-22[Bluetooth] Remove global conf_mtu variable from L2CAPMarcel Holtmann
After the change to the L2CAP configuration parameter handling the global conf_mtu variable is no longer needed and so remove it. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-10-22[Bluetooth] Finish L2CAP configuration only with acceptable settingsMarcel Holtmann
The parameters of the L2CAP output configuration might not be accepted after the first configuration round. So only indicate a finished output configuration when acceptable settings are provided. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-10-10[NET]: Make socket creation namespace safe.Eric W. Biederman
This patch passes in the namespace a new socket should be created in and has the socket code do the appropriate reference counting. By virtue of this all socket create methods are touched. In addition the socket create methods are modified so that they will fail if you attempt to create a socket in a non-default network namespace. Failing if we attempt to create a socket outside of the default network namespace ensures that as we incrementally make the network stack network namespace aware we will not export functionality that someone has not audited and made certain is network namespace safe. Allowing us to partially enable network namespaces before all of the exotic protocols are supported. Any protocol layers I have missed will fail to compile because I now pass an extra parameter into the socket creation code. [ Integrated AF_IUCV build fixes from Andrew Morton... -DaveM ] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-31[BLUETOOTH] l2cap: don't mangle cmd.lenAl Viro
Since nobody uses it after we convert it to host-endian, no need to do that at all. At that point l2cap is endian-clean. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-31[BLUETOOTH]: pass (host-endian) cmd length as explicit argument to ↵Al Viro
l2cap_conf_req() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-31[BLUETOOTH] l2cap: endianness annotationsAl Viro
no code changes, just documenting existing types Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-31[BLUETOOTH]: Fix endianness bug in l2cap_sock_listen()Al Viro
We loop through psm values, calling __l2cap_get_sock_by_addr(psm, ...) until we get NULL; then we set ->psm of our socket to htobs(psm). IOW, we find unused psm value and put it into our socket. So far, so good, but... __l2cap_get_sock_by_addr() compares its argument with ->psm of sockets. IOW, the entire thing works correctly only on little-endian. On big-endian we'll get "no socket with such psm" on the first iteration, since we won't find a socket with ->psm == 0x1001. We will happily conclude that 0x1001 is unused and slap htobs(0x1001) (i.e. 0x110) into ->psm of our socket. Of course, the next time around the same thing will repeat and we'll just get a fsckload of sockets with the same ->psm assigned. Fix: pass htobs(psm) to __l2cap_get_sock_by_addr() there. All other callers are already passing little-endian values and all places that store something in ->psm are storing little-endian. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-24[Bluetooth] Fix L2CAP configuration parameter handlingMarcel Holtmann
The L2CAP configuration parameter handling was missing the support for rejecting unknown options. The capability to reject unknown options is mandatory since the Bluetooth 1.2 specification. This patch implements its and also simplifies the parameter parsing. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-05-05[Bluetooth] Fix L2CAP and HCI setsockopt() information leaksMarcel Holtmann
The L2CAP and HCI setsockopt() implementations have a small information leak that makes it possible to leak kernel stack memory to userspace. If the optlen parameter is 0, no data will be copied by copy_from_user(), but the uninitialized stack buffer will be read and stored later. A call to getsockopt() can now retrieve the leaked information. To fix this problem the stack buffer given to copy_from_user() must be initialized with the current settings. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2007-04-25[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}Arnaldo Carvalho de Melo
To clearly state the intent of copying from linear sk_buffs, _offset being a overly long variant but interesting for the sake of saving some bytes. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-04-25[NET] BLUETOOTH: Use cpu_to_le{16,32}() where appropriate.YOSHIFUJI Hideaki
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>