6 files changed, 28 insertions, 13 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 748cb5b337bd..df4616fce929 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1030,6 +1030,21 @@ static inline bool inetdev_valid_mtu(unsigned mtu)
         return mtu >= 68;
 }
 
+static void inetdev_send_gratuitous_arp(struct net_device *dev,
+                                        struct in_device *in_dev)
+
+{
+        struct in_ifaddr *ifa = in_dev->ifa_list;
+
+        if (!ifa)
+                return;
+
+        arp_send(ARPOP_REQUEST, ETH_P_ARP,
+                 ifa->ifa_address, dev,
+                 ifa->ifa_address, NULL,
+                 dev->dev_addr, NULL);
+}
+
 /* Called only under RTNL semaphore */
 
 static int inetdev_event(struct notifier_block *this, unsigned long event,
@@ -1082,18 +1097,13 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
                 }
                 ip_mc_up(in_dev);
                 /* fall through */
-        case NETDEV_NOTIFY_PEERS:
         case NETDEV_CHANGEADDR:
+                if (!IN_DEV_ARP_NOTIFY(in_dev))
+                        break;
+                /* fall through */
+        case NETDEV_NOTIFY_PEERS:
                 /* Send gratuitous ARP to notify of link change */
-                if (IN_DEV_ARP_NOTIFY(in_dev)) {
-                        struct in_ifaddr *ifa = in_dev->ifa_list;
-
-                        if (ifa)
-                                arp_send(ARPOP_REQUEST, ETH_P_ARP,
-                                         ifa->ifa_address, dev,
-                                         ifa->ifa_address, NULL,
-                                         dev->dev_addr, NULL);
-                }
+                inetdev_send_gratuitous_arp(dev, in_dev);
                 break;
         case NETDEV_DOWN:
                 ip_mc_down(in_dev);
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index c5af909cf701..3c8dfa16614d 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -505,7 +505,9 @@ restart:
                         }
 
                         rcu_read_unlock();
+                        local_bh_disable();
                         inet_twsk_deschedule(tw, twdr);
+                        local_bh_enable();
                         inet_twsk_put(tw);
                         goto restart_rcu;
                 }
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index eb68a0e34e49..6613edfac28c 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -775,6 +775,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
                         .fl4_dst = dst,
                         .fl4_src = tiph->saddr,
                         .fl4_tos = RT_TOS(tos),
+                        .proto = IPPROTO_GRE,
                         .fl_gre_key = tunnel->parms.o_key
                 };
                 if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 788a3e74834e..6ed6603c2f6d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2722,6 +2722,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
         .destroy                =       ipv4_dst_destroy,
         .check                  =       ipv4_blackhole_dst_check,
         .default_mtu            =       ipv4_blackhole_default_mtu,
+        .default_advmss         =       ipv4_default_advmss,
         .update_pmtu            =       ipv4_rt_blackhole_update_pmtu,
 };
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index eb7f82ebf4a3..65f6c0406245 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1222,7 +1222,7 @@ static int tcp_check_dsack(struct sock *sk, struct sk_buff *ack_skb,
         }
 
         /* D-SACK for already forgotten data... Do dumb counting. */
-        if (dup_sack &&
+        if (dup_sack && tp->undo_marker && tp->undo_retrans &&
             !after(end_seq_0, prior_snd_una) &&
             after(end_seq_0, tp->undo_marker))
                 tp->undo_retrans--;
@@ -1299,7 +1299,8 @@ static u8 tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
 
         /* Account D-SACK for retransmitted packet. */
         if (dup_sack && (sacked & TCPCB_RETRANS)) {
-                if (after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
+                if (tp->undo_marker && tp->undo_retrans &&
+                    after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
                         tp->undo_retrans--;
                 if (sacked & TCPCB_SACKED_ACKED)
                         state->reord = min(fack_count, state->reord);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 406f320336e6..dfa5beb0c1c8 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2162,7 +2162,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
                 if (!tp->retrans_stamp)
                         tp->retrans_stamp = TCP_SKB_CB(skb)->when;
 
-                tp->undo_retrans++;
+                tp->undo_retrans += tcp_skb_pcount(skb);
 
                 /* snd_nxt is stored to detect loss of retransmitted segment,
                  * see tcp_input.c tcp_sacktag_write_queue().