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sockbufs: add sbreserve_locked_limit() with custom maxsockbuf limit.
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Authored by melifaro on Sep 27 2022, 1:57 PM.
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Summary

Protocols such as netlink may need a large socket receive buffer,
measured in tens of megabytes. This change allows netlink to
set larger socket buffers (given the privs are in place), without
requiring user to manuall bump maxsockbuf.

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rG FreeBSD src repository
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