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gnrc/ipv6/nib: allow for predictable static link-local addresses #20224

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merged 2 commits into from
Jan 5, 2024
Merged

gnrc/ipv6/nib: allow for predictable static link-local addresses #20224

merged 2 commits into from
Jan 5, 2024

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benpicco
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@benpicco benpicco commented Jan 3, 2024 •
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With GNRC_IPV6_STATIC_LLADDR we can set static link-local addresses.
They are however not predictable: the interface ID gets added to least significant byte of the address. Add another option CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED to avoid that.

Testing procedure

with CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED=0

2024-01-03 13:56:03,778 # Iface  7  HWaddr: 42:72  Channel: 26  NID: 0x23  PHY: O-QPSK 
2024-01-03 13:56:03,778 #           Long HWaddr: EE:9A:35:CC:EB:C8:42:72 
2024-01-03 13:56:03,779 #            State: IDLE 
2024-01-03 13:56:03,779 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2024-01-03 13:56:03,779 #           RTR_ADV  6LO  IPHC  
2024-01-03 13:56:03,779 #           Source address length: 8
2024-01-03 13:56:03,780 #           Link type: wireless
2024-01-03 13:56:03,780 #           inet6 addr: fe80::cafe:cafe:cafe:8  scope: link  VAL
2024-01-03 13:56:03,780 #           inet6 addr: fe80::ec9a:35cc:ebc8:4272  scope: link  VAL
2024-01-03 13:56:03,780 #           inet6 group: ff02::2
2024-01-03 13:56:03,780 #           inet6 group: ff02::1
2024-01-03 13:56:03,781 #           inet6 group: ff02::1:fffe:8
2024-01-03 13:56:03,781 #           inet6 group: ff02::1:ffc8:4272
2024-01-03 13:56:03,781 #           inet6 group: ff02::1a

with CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED=1

2024-01-03 13:56:45,673 # Iface  7  HWaddr: 16:BE  Channel: 26  NID: 0x23  PHY: O-QPSK 
2024-01-03 13:56:45,673 #           Long HWaddr: AE:8A:E9:6C:B7:14:16:BE 
2024-01-03 13:56:45,674 #            State: IDLE 
2024-01-03 13:56:45,674 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2024-01-03 13:56:45,675 #           RTR_ADV  6LO  IPHC  
2024-01-03 13:56:45,675 #           Source address length: 8
2024-01-03 13:56:45,675 #           Link type: wireless
2024-01-03 13:56:45,676 #           inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
2024-01-03 13:56:45,677 #           inet6 addr: fe80::ac8a:e96c:b714:16be  scope: link  VAL
2024-01-03 13:56:45,677 #           inet6 group: ff02::2
2024-01-03 13:56:45,678 #           inet6 group: ff02::1
2024-01-03 13:56:45,678 #           inet6 group: ff02::1:fffe:1
2024-01-03 13:56:45,678 #           inet6 group: ff02::1:ff14:16be
2024-01-03 13:56:45,678 #           inet6 group: ff02::1a

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@github-actions github-actions bot added Area: network Area: Networking Area: sys Area: System labels Jan 3, 2024
@benpicco benpicco requested review from fabian18 and maribu January 3, 2024 13:03
@benpicco benpicco force-pushed the GNRC_IPV6_STATIC_LLADDR_FIXED branch from 0deea3d to 4ca2dab Compare January 3, 2024 13:05
@fabian18
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fabian18 commented Jan 3, 2024

You should probably add a sentence of documentation in ipv6.h close to GNRC_IPV6_STATIC_LLADDR, and Kconfig.

@benpicco benpicco force-pushed the GNRC_IPV6_STATIC_LLADDR_FIXED branch from 4ca2dab to ec8271e Compare January 3, 2024 22:46
@miri64
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miri64 commented Jan 4, 2024

Just out of curiosity: What happens if you have this enabled with multiple interfaces (say the gnrc_border_router example) and ping the static address?

@fabian18
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fabian18 commented Jan 4, 2024

Just out of curiosity: What happens if you have this enabled with multiple interfaces (say the gnrc_border_router example) and ping the static address?

gnrc_border_router on same54-xpro + ethos (6) + ethernet (7) + atwinc15x0 (5)

Iface  5  HWaddr: F8:F0:05:AD:B2:94  Channel: 6  RSSI: -50  Link: up 
           State: IDLE 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wireless
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 addr: fe80::faf0:5ff:fead:b294  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:fffe:1
          inet6 group: ff02::1:ffad:b294
          
Iface  6  HWaddr: FE:76:BD:F3:16:D8 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 addr: fe80::fc76:bdff:fef3:16d8  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:fffe:1
          inet6 group: ff02::1:fff3:16d8
          
Iface  7  HWaddr: FC:C2:3D:2F:8E:90  Link: up 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::2  scope: link  VAL
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff00:2
          inet6 group: ff02::1:fffe:1

Linux: ping -I tap0 fe80::cafe:cafe:cafe:1

Screenshot from 2024-01-04 16-01-11

From the mac address I see that the ethos interface replies.

@fabian18
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fabian18 commented Jan 4, 2024

Is Kconfig not mandatory anymore?

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fabian18 commented Jan 4, 2024 •
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A question ragarding GNRC_IPV6_STATIC_LLADDR. My first idea to implement this would have been a configuration consisting of the { const char *addr, netdev_type_t type, unsigned index }. Did you rule this out because it obviously consumes more ROM?

@benpicco
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benpicco commented Jan 4, 2024

In this case we actually want the same link-local address on all interfaces (we use them to identify the board type).

I can add Kconfig but this will require renaming the GNRC_IPV6_STATIC_LLADDR macro to something like CONFIG_GNRC_IPV6_STATIC_LLADDR_STRING.

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fabian18 commented Jan 4, 2024

I mean Kconfig for CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED. I mean personally I do not really care much about that but I think it is still required by RIOT to have all CONFIG_ as Kconfig

@benpicco benpicco force-pushed the GNRC_IPV6_STATIC_LLADDR_FIXED branch from ec8271e to 7c97c7c Compare January 4, 2024 16:21
@github-actions github-actions bot added Area: examples Area: Example Applications Area: Kconfig Area: Kconfig integration labels Jan 4, 2024
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benpicco commented Jan 4, 2024

I think this was never a requirement, but I added a Kconfig entry.

@benpicco benpicco added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Jan 4, 2024
@benpicco benpicco force-pushed the GNRC_IPV6_STATIC_LLADDR_FIXED branch from 7c97c7c to 4a5757b Compare January 4, 2024 16:45
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riot-ci commented Jan 4, 2024

Murdock results

✔️ PASSED

4a5757b gnrc/ipv6/nib: add Kconfig for static link-local address

Success Failures Total Runtime
8101 0 8101 10m:55s

Artifacts

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I think this was never a requirement, but I added a Kconfig entry.

Ok sorry, I didn't want to enlarge this unnecessarily.

@benpicco benpicco added this pull request to the merge queue Jan 4, 2024
Merged via the queue into RIOT-OS:master with commit 1d3a7cd Jan 5, 2024
25 checks passed
@benpicco benpicco deleted the GNRC_IPV6_STATIC_LLADDR_FIXED branch January 5, 2024 10:46
@miri64
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miri64 commented Jan 5, 2024

Just out of curiosity: What happens if you have this enabled with multiple interfaces (say the gnrc_border_router example) and ping the static address?

gnrc_border_router on same54-xpro + ethos (6) + ethernet (7) + atwinc15x0 (5)

Iface  5  HWaddr: F8:F0:05:AD:B2:94  Channel: 6  RSSI: -50  Link: up 
           State: IDLE 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wireless
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 addr: fe80::faf0:5ff:fead:b294  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:fffe:1
          inet6 group: ff02::1:ffad:b294
          
Iface  6  HWaddr: FE:76:BD:F3:16:D8 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 addr: fe80::fc76:bdff:fef3:16d8  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:fffe:1
          inet6 group: ff02::1:fff3:16d8
          
Iface  7  HWaddr: FC:C2:3D:2F:8E:90  Link: up 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::2  scope: link  VAL
          inet6 addr: fe80::cafe:cafe:cafe:1  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff00:2
          inet6 group: ff02::1:fffe:1

Linux: ping -I tap0 fe80::cafe:cafe:cafe:1

Screenshot from 2024-01-04 16-01-11

From the mac address I see that the ethos interface replies.

Remotely, that was to be expected, since it is a link-local address (so only the address at the link would reply). However, my curiosity was more when you locally try to ping yourself. But now that I thought about this: You need to provide an interface with that anyways. So all fine. Thanks for testing though!

@MrKevinWeiss MrKevinWeiss added this to the Release 2024.01 milestone Feb 7, 2024
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