netdev - ctnetlink 12/12: compute generic part of event more acurately

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Date:	Thu, 26 Mar 2009 20:02:47 +0100 (MET)
From:	Patrick McHardy <kaber@...sh.net>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org
Subject: ctnetlink 12/12: compute generic part of event more acurately

commit d271e8bd8c60ce059ee36d836ba063cfc61c3e21
Author: Holger Eitzenberger <holger@...zenberger.org>
Date:   Thu Mar 26 13:37:14 2009 +0100

    ctnetlink: compute generic part of event more acurately
    
    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@...zenberger.org>
    Signed-off-by: Patrick McHardy <kaber@...sh.net>

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 03547c6..2fb833b 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -441,19 +441,28 @@ ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
 		+ 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
 
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