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netlink: refactor control data generation for recvmsg(2)
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Authored by glebius on Dec 10 2023, 4:56 AM.
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Details

Summary

Netlink should return a very simple control data on every recvmsg(2)
syscall. This data is associated with a syscall, not with an nlmsg,
neither with internal our internal representation (nl_bufs). There is
no need to pre-allocate it in non-sleepable context and attach to
nl_buf. Allocate right in the syscall with M_WAITOK. This also
shaves lots of code and simplifies things.

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