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Date: Fri, 25 Jan 2013 14:54:35 +0100
From: pablo@...filter.org
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 03/21] netfilter: ctnetlink: deliver labels to userspace
From: Florian Westphal <fw@...len.de>
Introduce CTA_LABELS attribute to send a bit-vector of currently active labels
to userspace.
Future patch will permit userspace to also set/delete active labels.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/uapi/linux/netfilter/nf_conntrack_common.h | 1 +
include/uapi/linux/netfilter/nfnetlink_conntrack.h | 1 +
net/netfilter/nf_conntrack_labels.c | 2 +-
net/netfilter/nf_conntrack_netlink.c | 41 ++++++++++++++++++++
4 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/netfilter/nf_conntrack_common.h b/include/uapi/linux/netfilter/nf_conntrack_common.h
index 1644cdd..d69483f 100644
--- a/include/uapi/linux/netfilter/nf_conntrack_common.h
+++ b/include/uapi/linux/netfilter/nf_conntrack_common.h
@@ -101,6 +101,7 @@ enum ip_conntrack_events {
IPCT_MARK, /* new mark has been set */
IPCT_NATSEQADJ, /* NAT is doing sequence adjustment */
IPCT_SECMARK, /* new security mark has been set */
+ IPCT_LABEL, /* new connlabel has been set */
};
enum ip_conntrack_expect_events {
diff --git a/include/uapi/linux/netfilter/nfnetlink_conntrack.h b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
index 86e930c..9e71e0c 100644
--- a/include/uapi/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
@@ -49,6 +49,7 @@ enum ctattr_type {
CTA_SECCTX,
CTA_TIMESTAMP,
CTA_MARK_MASK,
+ CTA_LABELS,
__CTA_MAX
};
#define CTA_MAX (__CTA_MAX - 1)
diff --git a/net/netfilter/nf_conntrack_labels.c b/net/netfilter/nf_conntrack_labels.c
index 0c542f4..ac5d080 100644
--- a/net/netfilter/nf_conntrack_labels.c
+++ b/net/netfilter/nf_conntrack_labels.c
@@ -46,7 +46,7 @@ int nf_connlabel_set(struct nf_conn *ct, u16 bit)
return 0;
if (test_and_set_bit(bit, labels->bits))
- return 0;
+ nf_conntrack_event_cache(IPCT_LABEL, ct);
return 0;
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index e0b10ee..5f53863 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -324,6 +324,40 @@ nla_put_failure:
#define ctnetlink_dump_secctx(a, b) (0)
#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+static int ctnetlink_label_size(const struct nf_conn *ct)
+{
+ struct nf_conn_labels *labels = nf_ct_labels_find(ct);
+
+ if (!labels)
+ return 0;
+ return nla_total_size(labels->words * sizeof(long));
+}
+
+static int
+ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
+{
+ struct nf_conn_labels *labels = nf_ct_labels_find(ct);
+ unsigned int len, i;
+
+ if (!labels)
+ return 0;
+
+ len = labels->words * sizeof(long);
+ i = 0;
+ do {
+ if (labels->bits[i] != 0)
+ return nla_put(skb, CTA_LABELS, len, labels->bits);
+ i++;
+ } while (i < labels->words);
+
+ return 0;
+}
+#else
+#define ctnetlink_dump_labels(a, b) (0)
+#define ctnetlink_label_size(a) (0)
+#endif
+
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
static inline int
@@ -464,6 +498,7 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_secctx(skb, ct) < 0 ||
+ ctnetlink_dump_labels(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
ctnetlink_dump_master(skb, ct) < 0 ||
@@ -562,6 +597,7 @@ ctnetlink_nlmsg_size(const struct nf_conn *ct)
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
#endif
+ ctnetlink_proto_size(ct)
+ + ctnetlink_label_size(ct)
;
}
@@ -663,6 +699,9 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
&& ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
+ if (events & (1 << IPCT_LABEL) &&
+ ctnetlink_dump_labels(skb, ct) < 0)
+ goto nla_put_failure;
if (events & (1 << IPCT_RELATED) &&
ctnetlink_dump_master(skb, ct) < 0)
@@ -1986,6 +2025,8 @@ ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
goto nla_put_failure;
#endif
+ if (ctnetlink_dump_labels(skb, ct) < 0)
+ goto nla_put_failure;
rcu_read_unlock();
return 0;
--
1.7.10.4
--
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