Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) ==================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) IP dynamic address hack-port v0.03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) ==================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) This stuff allows diald ONESHOT connections to get established by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) dynamically changing packet source address (and socket's if local procs).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) If enabled\ [#]_ and forwarding interface has changed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)   1)  Socket (and packet) source address is rewritten ON RETRANSMISSIONS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)       while in SYN_SENT state (diald-box processes).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)   2)  Out-bounded MASQueraded source address changes ON OUTPUT (when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)       internal host does retransmission) until a packet from outside is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)       received by the tunnel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) This is specially helpful for auto dialup links (diald), where the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) ``actual`` outgoing address is unknown at the moment the link is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) going up. So, the *same* (local AND masqueraded) connections requests that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) bring the link up will be able to get established.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) .. [#] At boot, by default no address rewriting is attempted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)   To enable::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)      # echo 1 > /proc/sys/net/ipv4/ip_dynaddr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)   To enable verbose mode::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)     # echo 2 > /proc/sys/net/ipv4/ip_dynaddr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)   To disable (default)::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)      # echo 0 > /proc/sys/net/ipv4/ip_dynaddr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) Enjoy!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) Juanjo  <jjciarla@raiz.uncu.edu.ar>