netfilter: nat: convert nat bysrc hash to rhashtable

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It did use a fixed-size bucket list plus single lock to protect add/del.

Unlike the main conntrack table we only need to add and remove keys.
Convert it to rhashtable to get table autosizing and per-bucket locking.

The maximum number of entries is -- as before -- tied to the number of
conntracks so we do not need another upperlimit.

The change does not handle rhashtable_remove_fast error, only possible
"error" is -ENOENT, and that is something that can happen legitimetely,
e.g. because nat module was inserted at a later time and no src manip
took place yet.

Tested with http-client-benchmark + httpterm with DNAT and SNAT rules
in place.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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This commit is contained in:

Florian Westphal 2016-07-05 12:07:24 +02:00 • committed by Pablo Neira Ayuso

parent 7c96643519

commit 870190a9ec

3 changed files with 71 additions and 59 deletions

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3

include/net/netfilter/nf_conntrack.h

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1

include/net/netfilter/nf_nat.h

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