From: Eric Dumazet <eric.dumazet@gmail.com>
To: kaber@trash.net
Cc: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org,
ulrich.weber@sophos.com
Subject: Re: [PATCH 02/17] netfilter: nat: remove module reference counting from NAT protocols
Date: Mon, 21 Nov 2011 08:36:37 +0100 [thread overview]
Message-ID: <1321860997.17419.7.camel@edumazet-laptop> (raw)
In-Reply-To: <1321854369-3432-3-git-send-email-kaber@trash.net>
Le lundi 21 novembre 2011 à 06:45 +0100, kaber@trash.net a écrit :
> From: Patrick McHardy <kaber@trash.net>
>
> The only remaining user of NAT protocol module reference counting is NAT
> ctnetlink support. Since this is a fairly short sequence of code, convert
> over to use RCU and remove module reference counting.
>
> Signed-off-by: Patrick McHardy <kaber@trash.net>
> @@ -612,16 +592,18 @@ static int nfnetlink_parse_nat_proto(struct nlattr *attr,
> if (err < 0)
> return err;
>
> - npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
> + rcu_read_lock();
> + npt = __nf_nat_proto_find(nf_ct_protonum(ct));
> if (npt->nlattr_to_range)
> err = npt->nlattr_to_range(tb, range);
> - nf_nat_proto_put(npt);
> + rcu_read_unlock();
> return err;
> }
Seems good, but you should explain in changelog why its safe.
(Using rcu also means special action must be taken in the write side,
here the module removal)
>
> static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
> [CTA_NAT_MINIP] = { .type = NLA_U32 },
> [CTA_NAT_MAXIP] = { .type = NLA_U32 },
> + [CTA_NAT_PROTO] = { .type = NLA_NESTED },
> };
I just dont understand this part :-(
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next prev parent reply other threads:[~2011-11-21 7:36 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 5:45 [RFC PATCH 00/17] netfilter: IPv6 NAT kaber
2011-11-21 5:45 ` [PATCH 01/17] netfilter: nf_nat: use hash random for bysource hash kaber
2011-11-21 7:43 ` Eric Dumazet
2011-11-21 5:45 ` [PATCH 02/17] netfilter: nat: remove module reference counting from NAT protocols kaber
2011-11-21 7:36 ` Eric Dumazet [this message]
2011-11-21 14:59 ` Patrick McHardy
2011-11-21 5:45 ` [PATCH 03/17] netfilter: nf_nat: export NAT definitions to userspace kaber
2011-11-21 5:45 ` [PATCH 04/17] netfilter: nf_nat: remove obsolete code from nf_nat_icmp_reply_translation() kaber
2011-11-21 5:45 ` [PATCH 05/17] netfilter: nf_nat: remove obsolete check in nf_nat_mangle_udp_packet() kaber
2011-11-21 5:45 ` [PATCH 06/17] netfilter: ctnetlink: remove dead NAT code kaber
2011-11-21 5:45 ` [PATCH 07/17] netfilter: conntrack: restrict NAT helper invocation to IPv4 kaber
2011-11-21 5:46 ` [PATCH 08/17] netfilter: nf_nat: add protoff argument to packet mangling functions kaber
2011-11-21 5:46 ` [PATCH 09/17] netfilter: add protocol independant NAT core kaber
2011-11-21 5:46 ` [PATCH 10/17] netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change kaber
2011-11-21 10:29 ` Eric Dumazet
2011-11-21 15:00 ` Patrick McHardy
2011-11-21 5:46 ` [PATCH 11/17] net: core: add function for incremental IPv6 pseudo header checksum updates kaber
2011-11-21 5:46 ` [PATCH 12/17] netfilter: ipv6: add IPv6 NAT support kaber
2011-11-21 5:46 ` [PATCH 13/17] netfilter: ip6tables: add MASQUERADE target kaber
2011-11-21 5:46 ` [PATCH 14/17] netfilter: ip6tables: add REDIRECT target kaber
2011-11-21 5:46 ` [PATCH 15/17] netfilter: ip6tables: add NETMAP target kaber
2011-11-21 5:46 ` [PATCH 16/17] netfilter: nf_nat: support IPv6 in FTP NAT helper kaber
2011-11-21 5:46 ` [PATCH 17/17] netfilter: nf_nat: support IPv6 in amanda " kaber
2011-11-21 13:05 ` [RFC PATCH 00/17] netfilter: IPv6 NAT Jan Engelhardt
2011-11-21 17:01 ` Patrick McHardy
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