Hi,
On 02/15/2017 11:16 AM, Luiz Augusto von Dentz wrote:
> Hi Alex,
>
> On Wed, Feb 15, 2017 at 10:24 AM, Luiz Augusto von Dentz
> <luiz.dentz@xxxxxxxxx> wrote:
>> Hi Alex,
>>
>> On Wed, Feb 15, 2017 at 9:44 AM, Alexander Aring <aar@xxxxxxxxxxxxxx> wrote:
>>>
>>> Hi,
>>>
>>> On 02/09/2017 03:55 PM, Luiz Augusto von Dentz wrote:
>>>> From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
>>>>
>>>> This allow technologies such as Bluetooth to use its native lladdr which
>>>> is eui48 instead of eui64 which was expected by functions like
>>>> lowpan_header_decompress and lowpan_header_compress.
>>>>
>>>> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
>>>> ---
>>>> net/6lowpan/iphc.c | 17 +++++++++++++++--
>>>> net/bluetooth/6lowpan.c | 43 ++++++++++---------------------------------
>>>> 2 files changed, 25 insertions(+), 35 deletions(-)
>>>>
>>>> diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
>>>> index fb5f6fa..ee88feb 100644
>>>> --- a/net/6lowpan/iphc.c
>>>> +++ b/net/6lowpan/iphc.c
>>>> @@ -827,8 +827,21 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
>>>> }
>>>> break;
>>>> default:
>>>> - /* check for SAM/DAM = 11 */
>>>> - memcpy(&tmp.s6_addr[8], lladdr, EUI64_ADDR_LEN);
>>>> + switch (dev->addr_len) {
>>>> + case ETH_ALEN:
>>>> + memcpy(&tmp.s6_addr[8], lladdr, 3);
>>>> + tmp.s6_addr[11] = 0xFF;
>>>> + tmp.s6_addr[12] = 0xFE;
>>>> + memcpy(&tmp.s6_addr[13], lladdr + 3, 3);
>>>> + break;
>>>> + case EUI64_ADDR_LEN:
>>>> + memcpy(&tmp.s6_addr[8], lladdr, EUI64_ADDR_LEN);
>>>> + break;
>>>> + default:
>>>> + dam = LOWPAN_IPHC_DAM_11;
>>>> + goto out;
>>>> + }
>>>> +
>>>> /* second bit-flip (Universe/Local) is done according RFC2464 */
>>>> tmp.s6_addr[8] ^= 0x02;
>>>
>>> move this handling in per link-layer layer decision, see below.
>>>
>>>> /* context information are always used */
>>>
>>> PLEASE... and this is one of my rant!
>>>
>>> PLEASE LOOK WHAT I HAVE DONE IN THIS FILE IN MY RFC PATCH SERIES YOU
>>> NEED TO FIX MORE THAN JUST CONTEXT BASED COMPRESSION.
>>>
>>> e.g. stateless un/compression
>>
>> I haven't changed that and probably it needs a separate patch in that
>> case since Im only, and I really mean only, fixing the address length
>> and because your patches end up changing a lot more things it is
>> pretty hard to extract the exact parts that fixes this.
>
> Btw I just checked your patch and there doesn't seem to have fix what
> you saying, in fact it is exact the same code as above:
>
> http://www.spinics.net/lists/linux-bluetooth/msg67937.html
>
Just to be sure we talking about the both thing:
For example:
lowpan_iphc_uncompress_addr
You didn't changed that function which still use 8 byte lladdr and FF:FE
pattern. It will still be broken.
My idea: Make a callback with prefix and lladdr as parameter to generate
such address. Then on stateless you can call it with L2 saddr/daddr and
ff80::/64 prefix. For stateful the same but with prefix from context
table.
btw: I cc now linux-wpan.
- Alex
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