Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:
 "This fixes the most immediate fallout from yesterday's networking
  merge:

   1) sock_tx_timestamp() must not clear the passed in tx_flags, but
      rather add to them.  Fix from Eric Dumazet.

   2) The hyperv driver sendbuf region increase needs to be decreased
      slightly to handle older backends.  From KY Srinivasan.

   3) Fix RCU lockdep splats in netlink diag after recent hashing
      changes, from Thomas Graf.

   4) The new IPV6_FLOWLABEL was given a socket option number that
      overlapped with an existing IP6 tables one, breaking ip6_tables.
      Fixed by Pablo Neira Ayuso"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  netlink: hold nl_sock_hash_lock during diag dump
  tcp: md5: check md5 signature without socket lock
  net: fix USB network driver config option.
  net: reallocate new socket option number for IPV6_AUTOFLOWLABEL
  vmxnet3: fix decimal printf format specifiers prefixed with 0x
  net-timestamp: cumulative tcp timestamping fixes
  hyperv: Adjust the size of sendbuf region to support ws2008r2
  cxgb4: Fix for SR-IOV VF initialization
  net-timestamp: sock_tx_timestamp() fix

8 files changed, 73 insertions, 33 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 744af67a5989..181b70ebd964 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -426,13 +426,15 @@ void tcp_init_sock(struct sock *sk)
 }
 EXPORT_SYMBOL(tcp_init_sock);
 
-void tcp_tx_timestamp(struct sock *sk, struct sk_buff *skb)
+static void tcp_tx_timestamp(struct sock *sk, struct sk_buff *skb)
 {
-	struct skb_shared_info *shinfo = skb_shinfo(skb);
+	if (sk->sk_tsflags) {
+		struct skb_shared_info *shinfo = skb_shinfo(skb);
 
-	sock_tx_timestamp(sk, &shinfo->tx_flags);
-	if (shinfo->tx_flags & SKBTX_ANY_SW_TSTAMP)
-		shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
+		sock_tx_timestamp(sk, &shinfo->tx_flags);
+		if (shinfo->tx_flags & SKBTX_ANY_TSTAMP)
+			shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
+	}
 }
 
 /*
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 992a1f926009..dceff5fe8e66 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1167,7 +1167,8 @@ clear_hash_noput:
 }
 EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
 
-static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+static bool __tcp_v4_inbound_md5_hash(struct sock *sk,
+				      const struct sk_buff *skb)
 {
 	/*
 	 * This gets called for each TCP segment that arrives
@@ -1220,6 +1221,17 @@ static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 	return false;
 }
 
+static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+{
+	bool ret;
+
+	rcu_read_lock();
+	ret = __tcp_v4_inbound_md5_hash(sk, skb);
+	rcu_read_unlock();
+
+	return ret;
+}
+
 #endif
 
 static void tcp_v4_init_req(struct request_sock *req, struct sock *sk,
@@ -1432,16 +1444,6 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
 int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 {
 	struct sock *rsk;
-#ifdef CONFIG_TCP_MD5SIG
-	/*
-	 * We really want to reject the packet as early as possible
-	 * if:
-	 *  o We're expecting an MD5'd packet and this is no MD5 tcp option
-	 *  o There is an MD5 option and we're not expecting one
-	 */
-	if (tcp_v4_inbound_md5_hash(sk, skb))
-		goto discard;
-#endif
 
 	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
 		struct dst_entry *dst = sk->sk_rx_dst;
@@ -1644,6 +1646,18 @@ process:
 
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
+
+#ifdef CONFIG_TCP_MD5SIG
+	/*
+	 * We really want to reject the packet as early as possible
+	 * if:
+	 *  o We're expecting an MD5'd packet and this is no MD5 tcp option
+	 *  o There is an MD5 option and we're not expecting one
+	 */
+	if (tcp_v4_inbound_md5_hash(sk, skb))
+		goto discard_and_relse;
+#endif
+
 	nf_reset(skb);
 
 	if (sk_filter(sk, skb))
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index f597119fc4e7..bc1b83cb8309 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -14,12 +14,12 @@
 #include <net/tcp.h>
 #include <net/protocol.h>
 
-void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq, unsigned int seq,
-		    unsigned int mss)
+static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
+			   unsigned int seq, unsigned int mss)
 {
 	while (skb) {
-		if (ts_seq < (__u64) seq + mss) {
-			skb_shinfo(skb)->tx_flags = SKBTX_SW_TSTAMP;
+		if (before(ts_seq, seq + mss)) {
+			skb_shinfo(skb)->tx_flags |= SKBTX_SW_TSTAMP;
 			skb_shinfo(skb)->tskey = ts_seq;
 			return;
 		}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 22055b098428..f2ce95502392 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -667,7 +667,8 @@ clear_hash_noput:
 	return 1;
 }
 
-static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+static int __tcp_v6_inbound_md5_hash(struct sock *sk,
+				     const struct sk_buff *skb)
 {
 	const __u8 *hash_location = NULL;
 	struct tcp_md5sig_key *hash_expected;
@@ -707,6 +708,18 @@ static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 	}
 	return 0;
 }
+
+static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+{
+	int ret;
+
+	rcu_read_lock();
+	ret = __tcp_v6_inbound_md5_hash(sk, skb);
+	rcu_read_unlock();
+
+	return ret;
+}
+
 #endif
 
 static void tcp_v6_init_req(struct request_sock *req, struct sock *sk,
@@ -1247,11 +1260,6 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 	if (skb->protocol == htons(ETH_P_IP))
 		return tcp_v4_do_rcv(sk, skb);
 
-#ifdef CONFIG_TCP_MD5SIG
-	if (tcp_v6_inbound_md5_hash(sk, skb))
-		goto discard;
-#endif
-
 	if (sk_filter(sk, skb))
 		goto discard;
 
@@ -1424,6 +1432,11 @@ process:
 	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
 
+#ifdef CONFIG_TCP_MD5SIG
+	if (tcp_v6_inbound_md5_hash(sk, skb))
+		goto discard_and_relse;
+#endif
+
 	if (sk_filter(sk, skb))
 		goto discard_and_relse;
 
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 479a344563d8..a324b4b34c90 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -104,6 +104,7 @@ static atomic_t nl_table_users = ATOMIC_INIT(0);
 
 /* Protects netlink socket hash table mutations */
 DEFINE_MUTEX(nl_sk_hash_lock);
+EXPORT_SYMBOL_GPL(nl_sk_hash_lock);
 
 static int lockdep_nl_sk_hash_is_held(void)
 {
diff --git a/net/netlink/af_netlink.h b/net/netlink/af_netlink.h
index 60f631fb7087..b20a1731759b 100644
--- a/net/netlink/af_netlink.h
+++ b/net/netlink/af_netlink.h
@@ -73,5 +73,6 @@ struct netlink_table {
 
 extern struct netlink_table *nl_table;
 extern rwlock_t nl_table_lock;
+extern struct mutex nl_sk_hash_lock;
 
 #endif
diff --git a/net/netlink/diag.c b/net/netlink/diag.c
index 7301850eb56f..de8c74a3c061 100644
--- a/net/netlink/diag.c
+++ b/net/netlink/diag.c
@@ -170,6 +170,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 
 	req = nlmsg_data(cb->nlh);
 
+	mutex_lock(&nl_sk_hash_lock);
 	read_lock(&nl_table_lock);
 
 	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
@@ -183,6 +184,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	} else {
 		if (req->sdiag_protocol >= MAX_LINKS) {
 			read_unlock(&nl_table_lock);
+			mutex_unlock(&nl_sk_hash_lock);
 			return -ENOENT;
 		}
 
@@ -190,6 +192,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	}
 
 	read_unlock(&nl_table_lock);
+	mutex_unlock(&nl_sk_hash_lock);
 
 	return skb->len;
 }
diff --git a/net/socket.c b/net/socket.c
index ae89569a2db5..95ee7d8682e7 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -610,20 +610,26 @@ void sock_release(struct socket *sock)
 }
 EXPORT_SYMBOL(sock_release);
 
-void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
+void sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags)
 {
-	*tx_flags = 0;
+	u8 flags = *tx_flags;
+
 	if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
-		*tx_flags |= SKBTX_HW_TSTAMP;
+		flags |= SKBTX_HW_TSTAMP;
+
 	if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
-		*tx_flags |= SKBTX_SW_TSTAMP;
+		flags |= SKBTX_SW_TSTAMP;
+
 	if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
-		*tx_flags |= SKBTX_SCHED_TSTAMP;
+		flags |= SKBTX_SCHED_TSTAMP;
+
 	if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)
-		*tx_flags |= SKBTX_ACK_TSTAMP;
+		flags |= SKBTX_ACK_TSTAMP;
 
 	if (sock_flag(sk, SOCK_WIFI_STATUS))
-		*tx_flags |= SKBTX_WIFI_STATUS;
+		flags |= SKBTX_WIFI_STATUS;
+
+	*tx_flags = flags;
 }
 EXPORT_SYMBOL(sock_tx_timestamp);