Hi, this patch series introduces a private neighbour dataroom for 6LoWPAN interfaces. The first use case for such private neighbour data is short address handling for 802.15.4 6LoWPAN networks. This private data can also be useful for other upcomming 6lowpan handling, which need to be stored inside each neighbour for IPv6 (6LoWPAN) neighbour discovery. The patch series introduces a generic 6LoWPAN specific neighbour private data (which is currently emtpy) and an additional linklayer specific neighbour private data. This linklayer data will be used by 802.15.4 to adding short address handling. Future work for generic 6LoWPAN (net/6lowpan) branch will introduce some additional callbacks for handle generic 6lowpan neighbour private data. e.g. 6LoWPAN Capability Indication Option [0]. Note: There exists two notes about this implementation currently: The first one is about the handling in net/ipv6/ndisc.c: I am not sure if we should implement it in this way, with a lot of #ifdefs and runtime decisions if the interface is a lowpan interface. Maybe introduce some callback structure to handle "additional" things for "net/ipv6/ndisc.c" OR create a own neighbour discovery cache inside of "net/6lowpan/ndisc.c" which will use some function from "net/ipv6/ndisc.c" (simple remove some static and add EXPORT_SYMBOL). In my opinion the "net/6lowpan/ndisc.c" which use functions From "net/ipv6/ndisc.c" will be the best option. There are too much outside and the ipv6 ndisc implementation will be more complex if we put ipv6 and 6lowpan nd implementation into one file. e.g. RFC 6775 [1] also describe a different handling for 6LoWPAN-ND. Of course, we need then an own UAPI and tool to dump the 6LoWPAN related neighbour data. The second note is: I have no glue if the short address handling is RFC compliant. How it works currently is that the short address is an optional address option inside of NA/NS (of course we need also the address option in RS). It will not work when an extended address option isn't there. In my opinion an extended address field is always there because this address is always available. If I am wrong, then we need to add some dummy extended addr (maybe all zero-extended, but "ip -6 neigh will be look somewhat wrong then. :-) ). We currently doesn't accept a NA/NS which don't has the extended address inside the option fields. If there exists a valid source address on the link, then extended address and short address will be added to the option. The length field inside the option field will be indicated if extended or short, see [2]. In case no valid source address is there, then the extended address option will be added. Another 6LoWPAN stack RIOT will do a complete different handling here: It add extended address XOR short address to the NS/NA messages, depends on configuration. It also drops NS/NA messages which contains two address options. So I can't test it, I don't know which way is the correct way, if RIOT do it right then I think we don't need to have a private data for each neighbour, because we can handle dev->addr as extended or short then, but I think RIOT is wrong here. Future handling of this patch series: I will try to get at first the 802.15.4/6LoWPAN stuff mainline which doesn't include the ipv6/ndisc changes. - Alex [0] https://tools.ietf.org/html/rfc7400 [1] https://tools.ietf.org/html/rfc6775 [2] https://tools.ietf.org/html/rfc4944#section-8 Alexander Aring (19): ieee802154: cleanups for ieee802154.h ieee802154: add short address helpers nl802154: avoid address change while running lowpan ieee802154: 6lowpan: fix short addr hash 6lowpan: change naming for lowpan private data 6lowpan: move lowpan_802154_dev to 6lowpan 6lowpan: iphc: rename add lowpan prefix 6lowpan: iphc: remove unnecessary zero data 6lowpan: move eui64 uncompress function 6lowpan: add lowpan_is_ll function 6lowpan: move mac802154 header 6lowpan: add private neighbour data addrconf: add 802.15.4 short addr slaac ndisc: add addr_len parameter to ndisc_opt_addr_space ndisc: add addr_len parameter to ndisc_opt_addr_data ndisc: add addr_len parameter to ndisc_fill_addr_option ndisc: add short address to ndisc opts parsing ndisc: add support for short address option 6lowpan: add support for 802.15.4 short addr handling include/linux/ieee802154.h | 35 +++++- include/linux/netdevice.h | 3 +- include/net/6lowpan.h | 68 +++++++++++- include/net/mac802154.h | 10 ++ include/net/ndisc.h | 20 ++-- net/6lowpan/core.c | 8 +- net/6lowpan/debugfs.c | 22 ++-- net/6lowpan/iphc.c | 198 ++++++++++++++++++++-------------- net/6lowpan/nhc_udp.c | 2 +- net/bluetooth/6lowpan.c | 84 ++++++++------- net/ieee802154/6lowpan/6lowpan_i.h | 14 +-- net/ieee802154/6lowpan/core.c | 18 +++- net/ieee802154/6lowpan/tx.c | 131 ++++++++++++----------- net/ieee802154/nl802154.c | 10 ++ net/ipv6/addrconf.c | 40 +++++++ net/ipv6/ndisc.c | 214 ++++++++++++++++++++++++++++++++----- net/ipv6/route.c | 4 +- 17 files changed, 628 insertions(+), 253 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wpan" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
