Some modules in extras not loadable

[Michael Root]

Running 2018.5 K26ARM USB AIO-64K on an R8000, some modules in the 2018.5 extras tarball load fine (eg. zlib_deflate), but many others fail:

#!
# insmod xfrm4_tunnel.ko 
insmod: can't insert 'xfrm4_tunnel.ko': Invalid argument

Details from syslog:

#!

Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol xfrm4_tunnel_register (err 0)
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: disagrees about version of symbol xfrm_register_type
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol xfrm_register_type (err -22)
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: disagrees about version of symbol skb_push
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol skb_push (err -22)
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: disagrees about version of symbol xfrm_unregister_type
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol xfrm_unregister_type (err -22)
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol xfrm4_tunnel_deregister (err 0)
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: disagrees about version of symbol xfrm4_rcv_encap
Jan  1 01:35:41 R8000 kern.warn kernel: xfrm4_tunnel: Unknown symbol xfrm4_rcv_encap (err -22)

The common denominator in the modules that don't load seems to be the skb_push symbol.

The ipsec modules in extras are very handy, as they allow setting up an iOS-native IKEv2 or IPsec VPN.

[Michael Root]

Another data point: I reverted the R8000 to 2018.2 K26ARM USB AIO-64K, as I also have a Linksys EA6900 running that version, and the ipsec extras modules work fine on that hardware. Unfortunately, I still get the same "Unknown symbol" errors on the R8000. To summarize:

• EA6500 + 2018.2 AIO firmware + 2018.2 arm-extras: works fine
• R8000 + 2018.2 AIO firmware + 2018.2 arm-extras: "unknown symbol"

[Michael Root]

Yet another data point: I updated my EA6900 to 2018.5, and the corresponding arm-extras ipsec modules work fine on that hardware. Maybe there's some issue with the R8000 build config?

[Michael Root]

Still an issue with the 2019.1 build and assocated arm-extra tarball:

root@R8000:/opt/extras/ipsec# insmod xfrm4_mode_transport.ko 
insmod: can't insert 'xfrm4_mode_transport.ko': Invalid argument
root@R8000:/opt/extras/ipsec# dmesg
xfrm4_mode_transport: disagrees about version of symbol xfrm_unregister_mode
xfrm4_mode_transport: Unknown symbol xfrm_unregister_mode (err -22)
xfrm4_mode_transport: disagrees about version of symbol xfrm_register_mode
xfrm4_mode_transport: Unknown symbol xfrm_register_mode (err -22)
root@R8000:/opt/extras/ipsec# ls -l xfrm4_mode_transport.ko 
     4 -rw-r--r--    1 1000     1000          3756 Feb 26  2019 xfrm4_mode_transport.ko
root@R8000:/opt/extras/ipsec# md5sum xfrm4_mode_transport.ko
1cb164f8e4aeed63257a77bc5ecdf61d  xfrm4_mode_transport.ko
root@R8000:/opt/extras/ipsec# uname -a
Linux R8000 2.6.36.4brcmarm #5 SMP PREEMPT Mon Feb 25 21:07:48 CET 2019 armv7l Tomato
root@R8000:/opt/extras/ipsec# nvram get os_version
2019.1 K26ARM USB AIO-64K

Would really appreciate your thoughts--even if it's "sorry, too busy to fix"... Thanks :)

[Old3nglish 800]

Shooting in the dark, trying to be helpful.

Reference:

https://stackoverflow.com/questions/17560989/insmod-failing-to-insert-a-really-simple-module

https://stackoverflow.com/questions/49243381/insmod-error-could-not-insert-module-kernel-ko-invalid-parameters-error-rel

https://dev.archive.openwrt.org/ticket/7176.html

https://www.linuxquestions.org/questions/programming-9/insmod-error-inserting-%27kernel-ko%27-1-invalid-parameters-782535/