Merge branch 'linus' into core/softirq

[cascardo/linux.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index cf0e167..48f1e04 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -119,6 +119,7 @@
 #include <linux/err.h>
 #include <linux/ctype.h>
 #include <linux/if_arp.h>
+#include <linux/if_vlan.h>
 
 #include "net-sysfs.h"
 
@@ -1362,6 +1363,29 @@ void netif_device_attach(struct net_device *dev)
 }
 EXPORT_SYMBOL(netif_device_attach);
 
+static bool can_checksum_protocol(unsigned long features, __be16 protocol)
+{
+       return ((features & NETIF_F_GEN_CSUM) ||
+               ((features & NETIF_F_IP_CSUM) &&
+                protocol == htons(ETH_P_IP)) ||
+               ((features & NETIF_F_IPV6_CSUM) &&
+                protocol == htons(ETH_P_IPV6)));
+}
+
+static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
+{
+       if (can_checksum_protocol(dev->features, skb->protocol))
+               return true;
+
+       if (skb->protocol == htons(ETH_P_8021Q)) {
+               struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
+               if (can_checksum_protocol(dev->features & dev->vlan_features,
+                                         veh->h_vlan_encapsulated_proto))
+                       return true;
+       }
+
+       return false;
+}
 
 /*
  * Invalidate hardware checksum when packet is to be mangled, and
@@ -1640,14 +1664,8 @@ int dev_queue_xmit(struct sk_buff *skb)
        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                skb_set_transport_header(skb, skb->csum_start -
                                              skb_headroom(skb));
-
-               if (!(dev->features & NETIF_F_GEN_CSUM) &&
-                   !((dev->features & NETIF_F_IP_CSUM) &&
-                     skb->protocol == htons(ETH_P_IP)) &&
-                   !((dev->features & NETIF_F_IPV6_CSUM) &&
-                     skb->protocol == htons(ETH_P_IPV6)))
-                       if (skb_checksum_help(skb))
-                               goto out_kfree_skb;
+               if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
+                       goto out_kfree_skb;
        }
 
 gso:
@@ -2059,6 +2077,10 @@ int netif_receive_skb(struct sk_buff *skb)
 
        rcu_read_lock();
 
+       /* Don't receive packets in an exiting network namespace */
+       if (!net_alive(dev_net(skb->dev)))
+               goto out;
+
 #ifdef CONFIG_NET_CLS_ACT
        if (skb->tc_verd & TC_NCLS) {
                skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);