4 files changed, 44 insertions, 20 deletions

diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
index 09c8889..de33803 100644
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ b/net/ipv6/netfilter/ip6t_LOG.c
@@ -410,7 +410,7 @@ fallback:
 		if (p != NULL) {
 			sb_add(m, "%02x", *p++);
 			for (i = 1; i < len; i++)
-				sb_add(m, ":%02x", p[i]);
+				sb_add(m, ":%02x", *p++);
 		}
 		sb_add(m, " ");
 
diff --git a/net/netfilter/nf_tproxy_core.c b/net/netfilter/nf_tproxy_core.c
index 4d87bef..474d621 100644
--- a/net/netfilter/nf_tproxy_core.c
+++ b/net/netfilter/nf_tproxy_core.c
@@ -28,26 +28,23 @@ nf_tproxy_destructor(struct sk_buff *skb)
 	skb->destructor = NULL;
 
 	if (sk)
-		nf_tproxy_put_sock(sk);
+		sock_put(sk);
 }
 
 /* consumes sk */
-int
+void
 nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
 {
-	bool transparent = (sk->sk_state == TCP_TIME_WAIT) ?
-				inet_twsk(sk)->tw_transparent :
-				inet_sk(sk)->transparent;
-
-	if (transparent) {
-		skb_orphan(skb);
-		skb->sk = sk;
-		skb->destructor = nf_tproxy_destructor;
-		return 1;
-	} else
-		nf_tproxy_put_sock(sk);
-
-	return 0;
+	/* assigning tw sockets complicates things; most
+	 * skb->sk->X checks would have to test sk->sk_state first */
+	if (sk->sk_state == TCP_TIME_WAIT) {
+		inet_twsk_put(inet_twsk(sk));
+		return;
+	}
+
+	skb_orphan(skb);
+	skb->sk = sk;
+	skb->destructor = nf_tproxy_destructor;
 }
 EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
 
diff --git a/net/netfilter/xt_TPROXY.c b/net/netfilter/xt_TPROXY.c
index 640678f..dcfd57e 100644
--- a/net/netfilter/xt_TPROXY.c
+++ b/net/netfilter/xt_TPROXY.c
@@ -33,6 +33,20 @@
 #include <net/netfilter/nf_tproxy_core.h>
 #include <linux/netfilter/xt_TPROXY.h>
 
+static bool tproxy_sk_is_transparent(struct sock *sk)
+{
+	if (sk->sk_state != TCP_TIME_WAIT) {
+		if (inet_sk(sk)->transparent)
+			return true;
+		sock_put(sk);
+	} else {
+		if (inet_twsk(sk)->tw_transparent)
+			return true;
+		inet_twsk_put(inet_twsk(sk));
+	}
+	return false;
+}
+
 static inline __be32
 tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr)
 {
@@ -141,7 +155,7 @@ tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport,
 					   skb->dev, NFT_LOOKUP_LISTENER);
 
 	/* NOTE: assign_sock consumes our sk reference */
-	if (sk && nf_tproxy_assign_sock(skb, sk)) {
+	if (sk && tproxy_sk_is_transparent(sk)) {
 		/* This should be in a separate target, but we don't do multiple
 		   targets on the same rule yet */
 		skb->mark = (skb->mark & ~mark_mask) ^ mark_value;
@@ -149,6 +163,8 @@ tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport,
 		pr_debug("redirecting: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n",
 			 iph->protocol, &iph->daddr, ntohs(hp->dest),
 			 &laddr, ntohs(lport), skb->mark);
+
+		nf_tproxy_assign_sock(skb, sk);
 		return NF_ACCEPT;
 	}
 
@@ -306,7 +322,7 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par)
 					   par->in, NFT_LOOKUP_LISTENER);
 
 	/* NOTE: assign_sock consumes our sk reference */
-	if (sk && nf_tproxy_assign_sock(skb, sk)) {
+	if (sk && tproxy_sk_is_transparent(sk)) {
 		/* This should be in a separate target, but we don't do multiple
 		   targets on the same rule yet */
 		skb->mark = (skb->mark & ~tgi->mark_mask) ^ tgi->mark_value;
@@ -314,6 +330,8 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par)
 		pr_debug("redirecting: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n",
 			 tproto, &iph->saddr, ntohs(hp->source),
 			 laddr, ntohs(lport), skb->mark);
+
+		nf_tproxy_assign_sock(skb, sk);
 		return NF_ACCEPT;
 	}
 
diff --git a/net/netfilter/xt_socket.c b/net/netfilter/xt_socket.c
index 00d6ae83..9cc4635 100644
--- a/net/netfilter/xt_socket.c
+++ b/net/netfilter/xt_socket.c
@@ -35,6 +35,15 @@
 #include <net/netfilter/nf_conntrack.h>
 #endif
 
+static void
+xt_socket_put_sk(struct sock *sk)
+{
+	if (sk->sk_state == TCP_TIME_WAIT)
+		inet_twsk_put(inet_twsk(sk));
+	else
+		sock_put(sk);
+}
+
 static int
 extract_icmp4_fields(const struct sk_buff *skb,
 		    u8 *protocol,
@@ -164,7 +173,7 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
 				       (sk->sk_state == TCP_TIME_WAIT &&
 					inet_twsk(sk)->tw_transparent));
 
-		nf_tproxy_put_sock(sk);
+		xt_socket_put_sk(sk);
 
 		if (wildcard || !transparent)
 			sk = NULL;
@@ -298,7 +307,7 @@ socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par)
 				       (sk->sk_state == TCP_TIME_WAIT &&
 					inet_twsk(sk)->tw_transparent));
 
-		nf_tproxy_put_sock(sk);
+		xt_socket_put_sk(sk);
 
 		if (wildcard || !transparent)
 			sk = NULL;