Re: [Linux-zigbee-devel] Old wiki updated but issues pinging fake nodes with relatively large payloads (> 93 octets)

[Alexander Aring <alex.aring@gmail.com>]

Hi,

On Wed, Aug 13, 2014 at 07:16:51PM +0200, Cristiano wrote:
> *
> Hi,
>   I eventually succeeded merging the Raspberry Pi 3.16+ kernel on net-next
> with trivial merge conflicts (resolved).
> I understand that the old linux-zigbee wiki is here now:
> 
> http://linux-zigbee.sourceforge.net/cgi-bin/trac.cgi/wiki/GettingStarted-0.2
> 
> But it looks quite outdated/wrong. So I rewrote it for myself. Anyway I
> still have problems which are described at the end.
> Here it is:
> 
> Build an 802.15.4-enabled Linux kernel with the following options:
> 
> CONFIG_IEEE802154=y
> CONFIG_IEEE802154_6LOWPAN=m
> CONFIG_MAC802154=m
> CONFIG_IEEE802154_DRIVERS=y
> # CONFIG_IEEE802154_FAKEHARD is not set
> CONFIG_IEEE802154_FAKELB=m
> 
> If you have a hardware device you may want to enable:
> CONFIG_IEEE802154_AT86RF230=m
> CONFIG_IEEE802154_MRF24J40=m
> CONFIG_IEEE802154_CC2520=m
> 
> Update your bootloader and boot your new kernel.
> 
> In our simulated network we will have 3 fake radios. One these radio
> interfaces, we will start 3 nodes which will have short addresses 0x1,
> 0x8001 and 0x8002. Node 0x1 will act as a coordinator and shall run
> izcoordinator on it, which will handle network with PAN ID 0x777. Nodes
> 0x8001 and 0x8002 will associate with coordinator and will receive addresses
> after association. We will start izchat tool on these nodes,  and will use
> Wireshark to monitor network traffic.
> Before you start you should check that everything works. If you try the
> following command:
> 
> Create 3 fake radio interfaces for network devices:
> # modprobe fakelb numlbs=3
> 
> Check it with:
> # iz listphy
> 
> You should see the following output:
> wpan-phy0  IEEE 802.15.4 PHY object
>     page: 0  channel: n/a
>     channels on page 0: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21 22 23 24 25 26
>     channels on page 1: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 2: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 3: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
>     channels on page 4: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
>     channels on page 5: 0 1 2 3 4 5 6 7
>     channels on page 6: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21
> 
> wpan-phy1  IEEE 802.15.4 PHY object
>     page: 0  channel: n/a
>     channels on page 0: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21 22 23 24 25 26
>     channels on page 1: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 2: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 3: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
>     channels on page 4: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
>     channels on page 5: 0 1 2 3 4 5 6 7
>     channels on page 6: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21
> 
> wpan-phy2  IEEE 802.15.4 PHY object
>     page: 0  channel: n/a
>     channels on page 0: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21 22 23 24 25 26
>     channels on page 1: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 2: 0 1 2 3 4 5 6 7 8 9 10
>     channels on page 3: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
>     channels on page 4: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
>     channels on page 5: 0 1 2 3 4 5 6 7
>     channels on page 6: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
> 21
> 
> Create 3 radio interfaces, one per each phy:
> # iz add wpan-phy0
> Registered new device ('wpan0') on phy wpan-phy0
> # iz add wpan-phy1
> Registered new device ('wpan1') on phy wpan-phy1
> # iz add wpan-phy2
> Registered new device ('wpan2') on phy wpan-phy2
> 
> Set distinct hw addresses:
> # ip link set wpan0 address de:ad:be:af:ca:fe:ba:be
> # ip link set wpan1 address ca:fe:ca:fe:ca:fe:ca:fe
> # ip link set wpan2 address be:be:be:be:be:be:be:be
> 
> Bring up logical interfaces (by default, one logical interface is associated
> with each radio):
> # ifconfig wpan0 up
> # ifconfig wpan1 up
> # ifconfig wpan2 up
> 
> Start wireshark to monitor traffic on the network:
> 
> # wireshark -i wpan0 -k
> Start coordinator (you need to do it as root as well):
> 
> # touch lease
> # izcoordinator -d 1 -l lease -i wpan0 -p 0x777 -s 1 -c 11 &
>

coordinator support isn't supported at the moment.

> If using the mainline kernel, assign short addresses manually using iz set:
> # iz set wpan1 777 8001 11
> # iz set wpan2 777 8002 11
> 
> Start simple chat program in two different consoles/terminals (0x8001 and
> 0x8002 are the short addresses are received during association):
> # izchat 777 8001 8002
> # izchat 777 8002 8001
> 
> Bring up 6LoWPAN:
> # ip link add link wpan0 name lowpan0 type lowpan
> # ip link set lowpan0 up
> 
> # ip link add link wpan1 name lowpan1 type lowpan
> # ip link set lowpan1 up
> 
> # ip link add link wpan2 name lowpan2 type lowpan
> # ip link set lowpan2 up
> 
> Check with:
> # ifconfig lowpan0
> # ifconfig lowpan1
> # ifconfig lowpan2
> 
> You should see the following output:
> lowpan0   Link encap:UNSPEC  HWaddr
> DE-AD-BE-AF-CA-FE-BA-BE-00-00-00-00-00-00-00-00
>           inet6 addr: fe80::dcad:beaf:cafe:babe/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1281  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> 
> lowpan1   Link encap:UNSPEC  HWaddr
> CA-FE-CA-FE-CA-FE-CA-FE-00-00-00-00-00-00-00-00
>           inet6 addr: fe80::c8fe:cafe:cafe:cafe/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1281  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> 
> lowpan2   Link encap:UNSPEC  HWaddr
> BE-BE-BE-BE-BE-BE-BE-BE-00-00-00-00-00-00-00-00
>           inet6 addr: fe80::bcbe:bebe:bebe:bebe/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1281  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> 
> We can see that Stateless Auto Configuration (SLAC) for the link local
> address works.
> 
> Ping between nodes:
> # ping6 fe80::c8fe:cafe:cafe:cafe%lowpan0
> # ping6 fe80::bcbe:bebe:bebe:bebe%lowpan0
> # ping6 fe80::bcbe:bebe:bebe:bebe%lowpan1
> # ping6 fe80::dcad:beaf:cafe:babe%lowpan1
> # ping6 fe80::dcad:beaf:cafe:babe%lowpan2
> # ping6 fe80::c8fe:cafe:cafe:cafe%lowpan2
> 
> 
> Anyway I have problems pinging the nodes when specifying a ping with payload
> size greater than 93. For example, pinging lowpan0 from lowpan1:
> 
> # ping6 -s94 fe80::dcad:beaf:cafe:babe%lowpan1
> 
> I don't get anything back (no output at all).
> 
> Running Tshark on lowpan0 (fe80::dcad:beaf:cafe:babe) shows this:
> 
> sudo tshark -i lowpan0
> tshark: Lua: Error during loading:
>  [string "/usr/share/wireshark/init.lua"]:45: dofile has been disabled
> Running as user "root" and group "root". This could be dangerous.
> Capturing on lowpan0
>   0.000000 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 64 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src:
> ca:af:bead:dc:0000:00[Malformed Packet]
>   0.000363 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 48
> Neighbor Advertisement fe80::dcad:beaf:cafe:babe (sol)
>   5.009835 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 64
> Neighbor Solicitation for fe80::c8fe:cafe:cafe:cafe from
> de:ad:be:af:ca:fe:ba:be
>   5.010874 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 48 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00[Packet
> size limited during capture]
>  47.019946 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 64 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src:
> ca:af:bead:dc:0000:00[Malformed Packet]
>  47.020289 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 48
> Neighbor Advertisement fe80::dcad:beaf:cafe:babe (sol)
>  52.029831 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 64
> Neighbor Solicitation for fe80::c8fe:cafe:cafe:cafe from
> de:ad:be:af:ca:fe:ba:be
>  52.030435 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 48 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00[Packet
> size limited during capture]
> 
> Specifying a ping payload size lesser than or equal to 93 somewhat works and
> Tshark output looks like this:
> 
> sudo tshark -i lowpan0
> tshark: Lua: Error during loading:
>  [string "/usr/share/wireshark/init.lua"]:45: dofile has been disabled
> Running as user "root" and group "root". This could be dangerous.
> Capturing on lowpan0
>   0.000000 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 125 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00
>   0.000417 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 125
> Echo (ping) reply id=0x1147, seq=1
>   1.001208 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 125 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00
>   1.001536 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 125
> Echo (ping) reply id=0x1147, seq=2
>   2.002675 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 125 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00
>   2.002997 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 125
> Echo (ping) reply id=0x1147, seq=3
>   3.004102 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 125 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00
>   3.004424 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 125
> Echo (ping) reply id=0x1147, seq=4
>   4.005586 ca:af:be:ad:dc:00:00:00 -> 00:00:00:80:fe:fe:ca:fe IEEE 802.15.4
> 125 Beacon, Dst: 00:00:00_80:fe:fe:ca:fe, Src: ca:af:bead:dc:0000:00
>   4.006001 fe80::dcad:beaf:cafe:babe -> fe80::c8fe:cafe:cafe:cafe ICMPv6 125
> Echo (ping) reply id=0x1147, seq=5
> 

wireshark with lowpan interface is broken.

> Is this a 6lowpan fragmentation issue?

Looks like but I tested it with current net-next kernel and it works.
Maybe you did something wrong with merging your rpi with net-next. Try
it under a qemu vm.

Do you have these patches:

http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=eb06481d69c60f6f9318e935053dce13fe3e8951

and

http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=51263fffadee28c99152fb78a2d41e3d10c9b0b5

but this is in current net-next, there was a little time where this was
broken.

> Tshark output looks weird expecially decoding IEEE 802.15.4 frames
> (addresses do not look good and what are those Beacon frames that only
> appear after started pinging?).
> Also, ICMPv6 echo requests are not present in the Tshark output.
> 
> Can anybody try the above instructions and confirm the issue?
> 

I tested it and it works on my side.

btw. there exists a new mailinglist for this project:

http://vger.kernel.org/vger-lists.html#linux-wpan

- Alex