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nfs-over-tls: add user space daemons rpc.tlsclntd and rpc.tlsservd

Description

nfs-over-tls: add user space daemons rpc.tlsclntd and rpc.tlsservd

The kernel changes needed for nfs-over-tls have been committed to main.
However, nfs-over-tls requires user space daemons to handle the
TLS handshake and other non-application data TLS records.
There is one daemon (rpc.tlsclntd) for the client side and one daemon
(rpc.tlsservd) for the server side, although they share a fair amount
of code found in rpc.tlscommon.c and rpc.tlscommon.h.
They use a KTLS enabled OpenSSL to perform the actual work and, as such,
are only built when MK_OPENSSL_KTLS is set.
Communication with the kernel is done via upcall RPCs done on AF_LOCAL
sockets and the custom system call rpctls_syscall.

Reviewed by: gbe (man pages only), jhb (usr.sbin/Makefile only)
Comments by: jhb
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D28430
Relnotes: yes

Details

Provenance
rmacklemAuthored on Feb 18 2021, 10:08 PM
Reviewer
gbe
Differential Revision
D28430: add nfs-over-tls daemons to head/main
Parents
R10:c67a2909a629: Move XPT_IMMEDIATE_NOTIFY handling out of periph lock.
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