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author | 2022-08-19 20:42:22 +0500 | |
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committer | 2022-09-15 08:39:19 +0000 | |
commit | 5f694d1ecfbe2315e9bbcc98a83b83620e6f6b94 (patch) | |
tree | abedb569e9c9155d0d0c957e10f7d0b2e42bfd75 /extras/emacs/tunnel-c-skel.el | |
parent | b3778cce705305ecc3401b9dd69790b200e82dbe (diff) |
nat: fix nat44-ed port range with multiple workers
The number of available dynamic ports is set to (0xffff - 1024) =
64511, which is not divisable by the pow2 number of workers - the
only integer divisors are 31 and 2081.
So, total dynamic port range of all workers will be less than it:
1 wrk: n = (port_per_thread = 64511/1)*1 = 64511 + 1025 = 65536
2 wrk: n = (port_per_thread = 64511/2)*2 = 64510 + 1025 = 65535
4 wrk: n = (port_per_thread = 64511/4)*4 = 64508 + 1025 = 65533
8 wrk: n = (port_per_thread = 64511/8)*8 = 64504 + 1025 = 65529
...
As seen, with multiple workers there are unused trailing ports for every
nat pool address and that is the reason of out-of-bound index in the
worker array on out2in path due (port - 1024) / port_per_thread math.
This was fixed in 5c9f9968de63fa627b4a72b344df36cdc686d18a, so packets
to unused ports will go to existing worker and dropped there.
Per RFC 6335 https://www.rfc-editor.org/rfc/rfc6335#section-6:
6. Port Number Ranges
o the System Ports, also known as the Well Known Ports, from 0-1023
(assigned by IANA)
o the User Ports, also known as the Registered Ports, from 1024-
49151 (assigned by IANA)
o the Dynamic Ports, also known as the Private or Ephemeral Ports,
from 49152-65535 (never assigned)
According that let's allocate dynamic ports from 1024 and have full port
range with a wide range of the workers number - 64 integer divisors in
total, including pow2 ones:
1 wrk: n = (port_per_thread = 64512/1)*1 = 64512 + 1024 = 65536
2 wrk: n = (port_per_thread = 64512/2)*2 = 64512 + 1024 = 65536
3 wrk: n = (port_per_thread = 64512/3)*3 = 64512 + 1024 = 65536
4 wrk: n = (port_per_thread = 64512/4)*4 = 64512 + 1024 = 65536
5 wrk: n = (port_per_thread = 64512/5)*5 = 64510 + 1024 = 65534
6 wrk: n = (port_per_thread = 64512/6)*6 = 64512 + 1024 = 65536
7 wrk: n = (port_per_thread = 64512/7)*7 = 64512 + 1024 = 65536
8 wrk: n = (port_per_thread = 64512/8)*8 = 64512 + 1024 = 65536
...
Modulo from 5c9f9968de63fa627b4a72b344df36cdc686d18a is still required
when the numbers of workers is not the integer divisor of 64512.
Type: fix
Fixes: 5c9f9968de63fa627b4a72b344df36cdc686d18a
Change-Id: I9edaea07e58ff4888812b0d86cbf41a3784b189e
Signed-off-by: Vladislav Grishenko <themiron@yandex-team.ru>
Diffstat (limited to 'extras/emacs/tunnel-c-skel.el')
0 files changed, 0 insertions, 0 deletions