Jan Engelhardt wrote:
On Thursday 2009-04-16 14:12, Patrick McHardy wrote:
Jan Engelhardt wrote:
So change per-cpu spinlocks to per-cpu rwlocks
and use read_lock() in ipt_do_table() to allow recursion...
iptables cannot quite recurse into itself due to the comefrom stuff.
Actually it can by using the REJECT target:
Yes, but it has to return an absolute verdict (which REJECT does),
so it's not really a recursion, it's more like a goto without return.
Its recursion in the sense that we reenter the same code path,
while holding a lock. The verdict is issued *after* recursing.
A (quite ugly) workaround would be to have ipt_REJECT queue
the packets to a temporary queue and have ipt_do_table call
dst_output() after dropping the lock.
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