Error write to TUN device errno=22

For Developers
1

Hello All!

i developing a toy application to get experience with the building of VPN ...
So , at the time my prog got a problem during call write () , follows a part of diagnostic message:

I/O error on TUN device, write(90 octets), **errno=22**

What I'm need to check additionally ?

22: tun30002: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN qlen 500
    link/[65534] 
    inet 10.33.212.202/30 scope global tun30002
       valid_lft forever preferred_lft forever
    inet6 fe80::35ba:275c:977d:d3bf/64 scope link 
       valid_lft forever preferred_lft forever

PS: a piece of code successfully checked on x86 and ARM.

2

Without knowing what you're trying to write and the status of the device when you get an EINVAL, it's hard to diagnose further.

1 Like
3

I resolved the problem. I have tried to write IP packet instead of ethernet frame + IP packet.
So the question is closed.

4

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