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If we can't find a free port, reset the NAT table

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This commit is contained in:
Thomas Leonard 2016-01-02 16:50:16 +00:00
parent f1ed6ffdd8
commit 0e8e142337
1 changed files with 8 additions and 2 deletions
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10
firewall.ml
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@ -78,10 +78,16 @@ let translate t frame =
let random_user_port () =
1024 + Random.int (0xffff - 1024)
let rec add_nat_rule_and_transmit t frame fn fmt logf =
let rec add_nat_rule_and_transmit ?(retries=100) t frame fn fmt logf =
let xl_port = random_user_port () in
match fn xl_port with
| Nat_rewrite.Overlap -> add_nat_rule_and_transmit t frame fn fmt logf (* Try a different port *)
| Nat_rewrite.Overlap when retries < 0 -> return ()
| Nat_rewrite.Overlap ->
if retries = 0 then (
Log.warn "Failed to find a free port; resetting NAT table" Logs.unit;
Router.reset t;
);
add_nat_rule_and_transmit ~retries:(retries - 1) t frame fn fmt logf (* Try a different port *)
| Nat_rewrite.Unparseable ->
Log.warn "Failed to add NAT rule: Unparseable" Logs.unit;
return ()