Hi, this patch series introduces the ndisc ops callback structure to add different handling for IPv6 neighbour discovery cache functionality. It implements at first the two following use-cases: - 6CO handling as userspace option (For all 6LoWPAN layers, BTLE/802.15.4) [0] - short address handling for 802.15.4 6LoWPAN only [1] Since my last patch series, I completely changed the whole ndisc_ops callback structure to not replace the whole ndisc functionality at recv/send level of NS/NA/RS/RA which I send in my previous patch-series "6lowpan: introduce basic 6lowpan-nd". I changed it now to add different handling in a very low-level way of ndisc functionality. The ndisc_ops don't must be registered to dev->ndisc_ops anymore, if they are not set, then no additional ipv6 ndisc handling will be done. This patch series now introduce a complete handling of short address for 802.15.4 6LoWPAN in case of send/recv of NA/NS/RS and RA. In case of RA (receive only) and PIO we also need a second prefix + short-address based address. This callback structure can be used later (I hope) for RFC 6775 [0]. This RFC defines some new option fields and messages for 6LoWPAN-ND. This patch series does not implement RFC 6775 (except we decide now to handle 6CO in userspace). Additional we can use the current ops for parse/fill ndisc options for kernel handled ndisc messages to add 6CIO, see [2]. I tested RA/NS/NA/RS messages with short address which seems to work, what I didn't test is the redirect messages since I don't know how to generate them. The short address for redirect messages are also some special case here, because the short address by a L3 target address lookuped by neighbour cache need to be added. btw: According to [3] sending redirect messages should be also disabled by default on 6lowpan interfaces, but can be activated afterwards. This is maybe something for the ipv6_devconf structure. There is a "accept_redirects" but no "disable_redirects". - Alex [0] https://tools.ietf.org/html/rfc7400 [1] https://tools.ietf.org/html/rfc6775 [2] https://tools.ietf.org/html/rfc4944#section-8 changes since RFC: - add lowlevel functions __ndisc_opt_addr_space, __ndisc_opt_addr_data and __ndisc_fill_addr_option for corresponding functions which doesn't requires net_device argument. - move ndisc_ops e.g. ndisc_ops_fill_addr_option function call into the corresponding device argument function ndisc_fill_addr_option. (Introduced a special static inline function for redirect handling). - fix error handling in addrconf_prefix_rcv_add_addr. (Please see, introduce new API handling that second address registration (in case of 802.15.4 6LoWPAN) will still be notified if failed, because dev->addr was successful. - add ieee802154 sub-directory in short address entry for 6lowpan UAPI. - add lowpan_802154_is_valid_src_short_addr, because 802.15.4 6lowpan defines the first bit as multicast (don't know how this can be working at the end, because some hardware addresses will handle such addresses in L2 as unicast. See: https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.xhtml#_6lowpan-parameters-2 changes since v2: - Introduce ndisc_ops to have our own implementation for dealing with NS/NA which allows also to support RFC6775 (e.g. ARO). - add handling for handling 6CO as userspace option for RA messages in case of 6LoWPAN interfaces. - change lowpan_is_ll to check on linklayer type only. - added some reviewed-by's. - move short addr slaac to net/6lowpan instead ipv6 handling. - add handling for context based address compression in case for short address as link-layer address. - change strategy to use short address, a short address will always be used when it's available. - Handle override flag in NA messages to update short address information or not. Alexander Aring (12): 6lowpan: add private neighbour data 6lowpan: add 802.15.4 short addr slaac 6lowpan: remove ipv6 module request ndisc: add __ndisc_opt_addr_space function ndisc: add __ndisc_opt_addr_data function ndisc: add __ndisc_fill_addr_option function addrconf: put prefix address add in an own function ipv6: introduce neighbour discovery ops ipv6: export several functions 6lowpan: introduce 6lowpan-nd 6lowpan: add support for getting short address 6lowpan: add support for 802.15.4 short addr handling include/linux/netdevice.h | 8 +- include/net/6lowpan.h | 16 +++ include/net/addrconf.h | 10 ++ include/net/ndisc.h | 248 +++++++++++++++++++++++++++++++++++++++--- net/6lowpan/6lowpan_i.h | 4 + net/6lowpan/Makefile | 2 +- net/6lowpan/core.c | 50 ++++++++- net/6lowpan/debugfs.c | 39 +++++++ net/6lowpan/iphc.c | 167 +++++++++++++++++++++++----- net/6lowpan/ndisc.c | 234 +++++++++++++++++++++++++++++++++++++++ net/ieee802154/6lowpan/core.c | 12 ++ net/ieee802154/6lowpan/tx.c | 113 +++++++++---------- net/ipv6/addrconf.c | 218 +++++++++++++++++++++---------------- net/ipv6/ndisc.c | 123 +++++++++++++-------- net/ipv6/route.c | 8 +- 15 files changed, 1004 insertions(+), 248 deletions(-) create mode 100644 net/6lowpan/ndisc.c -- 2.8.3 -- 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
