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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org
Subject: [PATCH net-next 07/10] netfilter: ctnetlink: add and use a helper for mark parsing
Date: Wed, 11 Aug 2021 10:49:05 +0200	[thread overview]
Message-ID: <20210811084908.14744-8-pablo@netfilter.org> (raw)
In-Reply-To: <20210811084908.14744-1-pablo@netfilter.org>

From: Florian Westphal <fw@strlen.de>

ctnetlink dumps can be filtered based on the connmark.

Prepare for status bit filtering by using a named structure and by
moving the mark parsing code to a helper.

Else ctnetlink_alloc_filter size grows a bit too big for my taste
when status handling is added.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_netlink.c | 42 ++++++++++++++++++----------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index e81af33b233b..e8368e66b0f5 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -852,6 +852,11 @@ static int ctnetlink_done(struct netlink_callback *cb)
 	return 0;
 }
 
+struct ctnetlink_filter_u32 {
+	u32 val;
+	u32 mask;
+};
+
 struct ctnetlink_filter {
 	u8 family;
 
@@ -862,10 +867,7 @@ struct ctnetlink_filter {
 	struct nf_conntrack_tuple reply;
 	struct nf_conntrack_zone zone;
 
-	struct {
-		u_int32_t val;
-		u_int32_t mask;
-	} mark;
+	struct ctnetlink_filter_u32 mark;
 };
 
 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
@@ -907,6 +909,24 @@ static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
 					 struct nf_conntrack_zone *zone,
 					 u_int32_t flags);
 
+static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
+				       const struct nlattr * const cda[])
+{
+#ifdef CONFIG_NF_CONNTRACK_MARK
+	if (cda[CTA_MARK]) {
+		mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
+
+		if (cda[CTA_MARK_MASK])
+			mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
+		else
+			mark->mask = 0xffffffff;
+	} else if (cda[CTA_MARK_MASK]) {
+		return -EINVAL;
+	}
+#endif
+	return 0;
+}
+
 static struct ctnetlink_filter *
 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
 {
@@ -924,18 +944,10 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
 
 	filter->family = family;
 
-#ifdef CONFIG_NF_CONNTRACK_MARK
-	if (cda[CTA_MARK]) {
-		filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
-		if (cda[CTA_MARK_MASK])
-			filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
-		else
-			filter->mark.mask = 0xffffffff;
-	} else if (cda[CTA_MARK_MASK]) {
-		err = -EINVAL;
+	err = ctnetlink_filter_parse_mark(&filter->mark, cda);
+	if (err)
 		goto err_filter;
-	}
-#endif
+
 	if (!cda[CTA_FILTER])
 		return filter;
 
-- 
2.20.1


  parent reply	other threads:[~2021-08-11  8:49 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11  8:48 [PATCH net-next 00/10] Netfilter updates for net-next Pablo Neira Ayuso
2021-08-11  8:48 ` [PATCH net-next 01/10] netfilter: nft_compat: use nfnetlink_unicast() Pablo Neira Ayuso
2021-08-11  9:30   ` patchwork-bot+netdevbpf
2021-08-11  8:49 ` [PATCH net-next 02/10] netfilter: flowtable: remove nf_ct_l4proto_find() call Pablo Neira Ayuso
2021-08-11  8:49 ` [PATCH net-next 03/10] netfilter: ipt_CLUSTERIP: only add arp mangle hook when required Pablo Neira Ayuso
2021-08-11  8:49 ` [PATCH net-next 04/10] netfilter: ipt_CLUSTERIP: use clusterip_net to store pernet warning Pablo Neira Ayuso
2021-08-11  8:49 ` [PATCH net-next 05/10] netfilter: remove xt pernet data Pablo Neira Ayuso
2021-08-11  8:49 ` [PATCH net-next 06/10] netfilter: ebtables: do not hook tables by default Pablo Neira Ayuso
2021-08-11  8:49 ` Pablo Neira Ayuso [this message]
2021-08-11  8:49 ` [PATCH net-next 08/10] netfilter: ctnetlink: allow to filter dump by status bits Pablo Neira Ayuso
2021-08-11  8:49 ` [PATCH net-next 09/10] netfilter: x_tables: never register tables by default Pablo Neira Ayuso
2021-09-15  9:51   ` youling257
2021-09-15  9:56     ` Florian Westphal
2021-09-15 10:12       ` youling 257
2021-09-15 14:34         ` Florian Westphal
2021-09-15 15:53           ` youling 257
2021-09-16 12:24             ` Florian Westphal
2021-09-16 15:59               ` youling 257
2021-08-11  8:49 ` [PATCH net-next 10/10] netfilter: nf_queue: move hookfn registration out of struct net Pablo Neira Ayuso

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