Patchwork [1/1] ctnetlink: compute generic part of event more acurately

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Submitter holger@eitzenberger.org
Date March 25, 2009, 9:25 p.m.
Message ID <20090325213123.842307488@jonathan.eitzenberger.org>
Download mbox | patch
Permalink /patch/25104/
State Not Applicable
Delegated to: David Miller
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Comments

holger@eitzenberger.org - March 25, 2009, 9:25 p.m.
On a box with most of the optional Netfilter switches turned off some
of the NLAs are never send, e. g. secmark, mark or the conntrack
byte/packet counters.  As a worst case scenario this may possibly
still lead to ctnetlink skbs being reallocated in netlink_trim()
later, loosing all the nice effects from the previous patches.

I try to solve that (at least partly) by correctly #ifdef'ing the
NLAs in the computation.

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Patrick McHardy - March 26, 2009, 12:38 p.m.
Holger Eitzenberger wrote:
> On a box with most of the optional Netfilter switches turned off some
> of the NLAs are never send, e. g. secmark, mark or the conntrack
> byte/packet counters.  As a worst case scenario this may possibly
> still lead to ctnetlink skbs being reallocated in netlink_trim()
> later, loosing all the nice effects from the previous patches.
> 
> I try to solve that (at least partly) by correctly #ifdef'ing the
> NLAs in the computation.

Applied, thanks Holger.
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Patch

Index: nf-next-2.6/net/netfilter/nf_conntrack_netlink.c
===================================================================
--- nf-next-2.6.orig/net/netfilter/nf_conntrack_netlink.c
+++ nf-next-2.6/net/netfilter/nf_conntrack_netlink.c
@@ -440,19 +440,28 @@  ctnetlink_alloc_skb(const struct nf_conn
 		+ 3 * NLA_TYPE_SIZE(u_int8_t)	/* CTA_PROTO_NUM */
 		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_ID */
 		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_STATUS */
+#ifdef CONFIG_NF_CT_ACCT
 		+ 2 * nla_total_size(0)		/* CTA_COUNTERS_ORIG|REPL */
 		+ 2 * NLA_TYPE_SIZE(uint64_t)	/* CTA_COUNTERS_PACKETS */
 		+ 2 * NLA_TYPE_SIZE(uint64_t)	/* CTA_COUNTERS_BYTES */
+#endif
 		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_TIMEOUT */
 		+ nla_total_size(0)		/* CTA_PROTOINFO */
 		+ nla_total_size(0)		/* CTA_HELP */
 		+ nla_total_size(NF_CT_HELPER_NAME_LEN)	/* CTA_HELP_NAME */
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
 		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_SECMARK */
+#endif
+#ifdef CONFIG_NF_NAT_NEEDED
 		+ 2 * nla_total_size(0)		/* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_POS */
 		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_BEFORE */
 		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_AFTER */
-		+ NLA_TYPE_SIZE(u_int32_t);	/* CTA_MARK */
+#endif
+#ifdef CONFIG_NF_CONNTRACK_MARK
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_MARK */
+#endif
+		;
 
 #undef NLA_TYPE_SIZE