[NETFILTER]: ctnetlink: add support for secmark

This patch adds support for James Morris' connsecmark.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter/nf_conntrack_common.h

@@ -133,6 +133,10 @@ enum ip_conntrack_events
 	/* NAT sequence adjustment */
 	IPCT_NATSEQADJ_BIT = 13,
 	IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
+
+	/* Secmark is set */
+	IPCT_SECMARK_BIT = 14,
+	IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
 };
 
 enum ip_conntrack_expect_events {

include/linux/netfilter/nfnetlink_conntrack.h

@@ -39,6 +39,7 @@ enum ctattr_type {
 	CTA_TUPLE_MASTER,
 	CTA_NAT_SEQ_ADJ_ORIG,
 	CTA_NAT_SEQ_ADJ_REPLY,
+	CTA_SECMARK,
 	__CTA_MAX
 };
 #define CTA_MAX (__CTA_MAX - 1)

net/netfilter/nf_conntrack_netlink.c

@@ -254,6 +254,22 @@ ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 #define ctnetlink_dump_mark(a, b) (0)
 #endif
 
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+static inline int
+ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
+{
+	__be32 mark = htonl(ct->secmark);
+
+	NLA_PUT(skb, CTA_SECMARK, sizeof(u_int32_t), &mark);
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+#else
+#define ctnetlink_dump_secmark(a, b) (0)
+#endif
+
 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 
 static inline int
@@ -392,6 +408,7 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 	    ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 	    ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 	    ctnetlink_dump_mark(skb, ct) < 0 ||
+	    ctnetlink_dump_secmark(skb, ct) < 0 ||
 	    ctnetlink_dump_id(skb, ct) < 0 ||
 	    ctnetlink_dump_use(skb, ct) < 0 ||
 	    ctnetlink_dump_master(skb, ct) < 0 ||
@@ -493,6 +510,11 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 		    && ctnetlink_dump_mark(skb, ct) < 0)
 			goto nla_put_failure;
 #endif
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+		if ((events & IPCT_SECMARK || ct->secmark)
+		    && ctnetlink_dump_secmark(skb, ct) < 0)
+			goto nla_put_failure;
+#endif
 
 		if (events & IPCT_COUNTER_FILLING &&
 		    (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||

net/netfilter/xt_CONNSECMARK.c

@@ -20,6 +20,7 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_CONNSECMARK.h>
 #include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
 
 #define PFX "CONNSECMARK: "
 
@@ -40,8 +41,10 @@ static void secmark_save(const struct sk_buff *skb)
 		enum ip_conntrack_info ctinfo;
 
 		ct = nf_ct_get(skb, &ctinfo);
-		if (ct && !ct->secmark)
+		if (ct && !ct->secmark) {
 			ct->secmark = skb->secmark;
+			nf_conntrack_event_cache(IPCT_SECMARK, skb);
+		}
 	}
 }