Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

FS#2848 - multicast ff02::2 not responding since 19.07 #6316

Closed
openwrt-bot opened this issue Feb 22, 2020 · 4 comments
Closed

FS#2848 - multicast ff02::2 not responding since 19.07 #6316

openwrt-bot opened this issue Feb 22, 2020 · 4 comments
Labels

Comments

@openwrt-bot
Copy link

openwrt-bot commented Feb 22, 2020

guifipedro:

cannot do multicast in nanostation m5 xw (and maybe applies for other devices with eth0.1 and eth0.2 simulating eth0 and eth1)

multicast is a core feature for running some routing protocols as bmx6 per cable)

iface="my ethernet"
ping6 ff02::2%$iface

did tests with several platforms

  • 18.06.4 ar71xx custom firmware -> works
  • 18.06.7 ar71xx openwrt.org -> works
  • 19.07.1 ar71xx custom firmware -> does not work
  • 19.07.1 ar71xx openwrt.org -> does not work
  • 19.07.1 ath79 openwrt.org -> does not work
  • snapshot ar71xx openwrt.org -> does not work
    • 0a21d2eb80787083852d92f1519f268df4873c07873ea6e4c1ba17af791fd801 3904.0 KB Mon Jun 17 14:08:48 2019
  • snapshot ath79 openwrt.org -> does not work
    • e6831b128017c83082110191a4cbdf37994beb7e2dae651b5b36b854b4674805 4096.3 KB Thu Feb 20 09:43:23 2020
    • OpenWrt SNAPSHOT, r12252-060b58fd6e

when I was figuring out what was happening, I did bmx6 routing (multicast) through br-lan in 3 devices, and I looked results with tcpdump -i br-lan. From the other devices I see that the multicast traffic from the affected device arrives (multicast packets go out), but when I see tcpdump -i br-lan in the affected device I only see his own multicast traffic (it's not entering anything else)

hence, looks like 19.07.1 introduced something that it does not allow this

@openwrt-bot
Copy link
Author

openwrt-bot commented Mar 24, 2020

guifipedro:

I was pending to try ping ff02::2%eth0 in different devices:

in nexx wt3020 8MB with OpenWrt 19.07.2 r10947-65030d81f3 -> works

in TP-Link TL-WDR4300 v1 with OpenWrt 19.07.1 r10911-c155900f66 -> works

(this two devices have eth0.1 and eth0.2 switches)

Hence, the problem is only focused in nanostation-m-xw

Tried new versions:

  • nanostation-m-xw:
    • with ar71xx and 19.07.2 -> does not work
    • with ath79 and 19.07.2 -> does not work
    • with ar71xx and 18.06.8 -> works

help

@openwrt-bot
Copy link
Author

openwrt-bot commented May 1, 2020

rogerpueyo:

Hi,

So I made some tests and narrowed down the range of commits where the one introducing the bug is:

Last known working commit:

  • r9528 [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=1cfbf95393decf047900e1b66b076a030704db20|1cfbf95393decf047900e1b66b076a030704db20 - kernel: bump 4.14 to 4.14.104]]

First known not working commit:

  • r9891 [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=da5bd73d702e7cb9f7da174977b606ca12ffd96b|da5bd73d702e7cb9f7da174977b606ca12ffd96b - kernel: bump 4.14 to 4.14.112]]

@openwrt-bot
Copy link
Author

openwrt-bot commented May 2, 2020

rogerpueyo:

Hi,

I could find the precise commit where IPv6 multicast stops working.

First, there is commit [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d3506d1bc160e4ce2833dff357f2a4b219772c77|d3506d1bc160e4ce2833dff357f2a4b219772c77 - ar71xx: ag71xx: fix compile error when enabling debug]] that broke the whole network for the device. It did not actually affect multicast, though.

Then came a series of commits related to AR8216. In particular, with commit [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d6366ce3665f010a7ae7061a557689643073040a|r9699 d6366ce - generic: ar8216: mib_work_func: read all port mibs everytime]] IPv6 multicast would still work, but the network is broken. Therefore:

  • [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d6366ce3665f010a7ae7061a557689643073040a|d6366ce366]] + revert [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d3506d1bc160e4ce2833dff357f2a4b219772c77|d3506d1bc1]]: still works (network + IPv6 multicast)

Next commit is [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=c8c2ef1d495dd3fd3096ac508e91a02f9c583ea8|r9700 c8c2ef1 - generic: ar8216: do a software reset for switch during hw_init]] and this one makes IPv6 multicast stop working. Plus, network is still broken from the debug-related commit. So:

  • [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=c8c2ef1d495dd3fd3096ac508e91a02f9c583ea8|c8c2ef1d49]] + revert [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d3506d1bc160e4ce2833dff357f2a4b219772c77|d3506d1bc1]]: IPv6 multicast does not work anymore

Finally, there's [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=31ea08a64bd977e0dc0a65804e4103cb52d81cea|31ea08a64bd977e0dc0a65804e4103cb52d81cea - ar71xx: ag71xx: Fix broken networking on some devices (FS#2177)]] restoring the broken network from d3506d1, but IPv6 multicast will not work anymore.

Summary

So, it seems that [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=c8c2ef1d495dd3fd3096ac508e91a02f9c583ea8|c8c2ef1d495dd3fd3096ac508e91a02f9c583ea8 - generic: ar8216: do a software reset for switch during hw_init]] introduced this IPv6 multicast bug, and it happened after [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d3506d1bc160e4ce2833dff357f2a4b219772c77|d3506d1bc160e4ce2833dff357f2a4b219772c77 - ar71xx: ag71xx: fix compile error when enabling debug]] broke the device's network, but unrelated.

@openwrt-bot
Copy link
Author

openwrt-bot commented May 2, 2020

rogerpueyo:

More tests:

  • ar71xx: current master + revert c8c2ef1: IPv6 multicast works
  • ath79: current master + revert c8c2ef1: IPv6 multicast works

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
Projects
None yet
Development

No branches or pull requests

1 participant