Hi, These patches aim at a bit different approach in handling IP over Bluetooth Low Energy connections that what has been implemented in the kernel so far. The goal is to lift the current L2CAP channel handling into Bluez userspace with the following benefits: * Authorization agent can be used directly * Use common code to handle profiles/services * Async IO * No new sets of kernel APIs are needed The essence of the change is to use a regular TUN/TAP interface enhanced with 6LoWPAN header compression and decompression with Bluez handling all other aspects of Bluetooth Low Energy connections. As the kernel already contains a very capable 6LoWPAN implementation, it is reused with the TUN/TAP driver providing appropriate IP interface handling while sending the resulting 6LoWPAN compressed IP packets to user space and Bluez that will send them further over BT LE L2CAP. These changes are not bound to current BT LE IPSP implementation, other upcoming BT LE profiles or other user space components can freely reuse what is being presented here. Luiz will send the corresponding changes for Bluez in a short while. Patches 1/3 and 2/3 introduce no new functionality but only a trivial transformation where the 6LoWPAN compression would take struct lowpan_dev instead of the bigger struct net_device. The reason is to decouple 6LoWPAN compression from the net_device itself, as the intended TUN/TAP driver does not have any relation to 6LoWPAN link types and the compression/decompression functionality is in essence a library to produce the desired IP packet transformation. Patch 3/3 introduces 6LoWPAN handling into the current tun.c driver by adding a new IFF_6LO flag for turning the feature on and off. Admittedly the features could be implemented better than it is right now, the point is not to come up with the prettiest code but to introduce the feature and then start discussing what the best option is to implement such an interface variant - is it via such an IFF_6LO flag, should a particular new type of BT LE 6LowPAN interface be created, or can this be generalized to cover also 802.15.4 interfaces although the 802.15.4 technology does not have anything corresponding to the Bluez user space daemon. Patches apply to bluetooth-next fac72b24 as of today. Cheers, Patrik Patrik Flykt (3): 6lowpan: Use struct lowpan_dev instead of net_device 6lowpan: Factor out lowpan device context initialization tun: Add 6LoWPAN compression/decompression to tun driver drivers/net/tun.c | 61 +++++++++++++++++++++- include/net/6lowpan.h | 10 ++-- include/uapi/linux/if_tun.h | 1 + net/6lowpan/core.c | 22 +++++--- net/6lowpan/iphc.c | 121 +++++++++++++++++++------------------------- net/6lowpan/nhc.c | 8 +-- net/6lowpan/nhc.h | 2 +- net/bluetooth/6lowpan.c | 6 ++- net/ieee802154/6lowpan/rx.c | 3 +- net/ieee802154/6lowpan/tx.c | 2 +- 10 files changed, 147 insertions(+), 89 deletions(-) -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
