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

Pull networking fixes from David Miller:

 1) Fix checksumming regressions, from Tom Herbert.

 2) Undo unintentional permissions changes for SCTP rto_alpha and
    rto_beta sysfs knobs, from Denial Borkmann.

 3) VXLAN, like other IP tunnels, should advertize it's encapsulation
    size using dev->needed_headroom instead of dev->hard_header_len.
    From Cong Wang.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  net: sctp: fix permissions for rto_alpha and rto_beta knobs
  vxlan: Checksum fixes
  net: add skb_pop_rcv_encapsulation
  udp: call __skb_checksum_complete when doing full checksum
  net: Fix save software checksum complete
  net: Fix GSO constants to match NETIF flags
  udp: ipv4: do not waste time in __udp4_lib_mcast_demux_lookup
  vxlan: use dev->needed_headroom instead of dev->hard_header_len
  MAINTAINERS: update cxgb4 maintainer

4 files changed, 61 insertions, 14 deletions

diff --git a/net/core/datagram.c b/net/core/datagram.c
index 6b1c04ca1d50..488dd1a825c0 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -739,22 +739,38 @@ __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len)
         __sum16 sum;
 
         sum = csum_fold(skb_checksum(skb, 0, len, skb->csum));
-        if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && !sum &&
-            !skb->csum_complete_sw)
-                netdev_rx_csum_fault(skb->dev);
-
-        /* Save checksum complete for later use */
-        skb->csum = sum;
-        skb->ip_summed = CHECKSUM_COMPLETE;
-        skb->csum_complete_sw = 1;
-
+        if (likely(!sum)) {
+                if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
+                    !skb->csum_complete_sw)
+                        netdev_rx_csum_fault(skb->dev);
+        }
+        skb->csum_valid = !sum;
         return sum;
 }
 EXPORT_SYMBOL(__skb_checksum_complete_head);
 
 __sum16 __skb_checksum_complete(struct sk_buff *skb)
 {
-        return __skb_checksum_complete_head(skb, skb->len);
+        __wsum csum;
+        __sum16 sum;
+
+        csum = skb_checksum(skb, 0, skb->len, 0);
+
+        /* skb->csum holds pseudo checksum */
+        sum = csum_fold(csum_add(skb->csum, csum));
+        if (likely(!sum)) {
+                if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
+                    !skb->csum_complete_sw)
+                        netdev_rx_csum_fault(skb->dev);
+        }
+
+        /* Save full packet checksum */
+        skb->csum = csum;
+        skb->ip_summed = CHECKSUM_COMPLETE;
+        skb->csum_complete_sw = 1;
+        skb->csum_valid = !sum;
+
+        return sum;
 }
 EXPORT_SYMBOL(__skb_checksum_complete);
 
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index bf92824af3f7..9cd5344fad73 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -689,6 +689,9 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
         new->ooo_okay           = old->ooo_okay;
         new->no_fcs             = old->no_fcs;
         new->encapsulation      = old->encapsulation;
+        new->encap_hdr_csum     = old->encap_hdr_csum;
+        new->csum_valid         = old->csum_valid;
+        new->csum_complete_sw   = old->csum_complete_sw;
 #ifdef CONFIG_XFRM
         new->sp                 = secpath_get(old->sp);
 #endif
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 185ed3e59802..d92f94b7e402 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1861,6 +1861,10 @@ static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net,
         unsigned int count, slot = udp_hashfn(net, hnum, udp_table.mask);
         struct udp_hslot *hslot = &udp_table.hash[slot];
 
+        /* Do not bother scanning a too big list */
+        if (hslot->count > 10)
+                return NULL;
+
         rcu_read_lock();
 begin:
         count = 0;
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 7e5eb7554990..dcb19592761e 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -34,6 +34,8 @@
  *    Sridhar Samudrala     <sri@us.ibm.com>
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <net/sctp/structs.h>
 #include <net/sctp/sctp.h>
 #include <linux/sysctl.h>
@@ -46,6 +48,11 @@ static int sack_timer_min = 1;
 static int sack_timer_max = 500;
 static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
 static int rwnd_scale_max = 16;
+static int rto_alpha_min = 0;
+static int rto_beta_min = 0;
+static int rto_alpha_max = 1000;
+static int rto_beta_max = 1000;
+
 static unsigned long max_autoclose_min = 0;
 static unsigned long max_autoclose_max =
         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
@@ -64,6 +71,9 @@ static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
                                 void __user *buffer, size_t *lenp,
                                 loff_t *ppos);
+static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
+                                   void __user *buffer, size_t *lenp,
+                                   loff_t *ppos);
 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
                              void __user *buffer, size_t *lenp,
                              loff_t *ppos);
@@ -126,15 +136,19 @@ static struct ctl_table sctp_net_table[] = {
                 .procname       = "rto_alpha_exp_divisor",
                 .data           = &init_net.sctp.rto_alpha,
                 .maxlen         = sizeof(int),
-                .mode           = 0444,
-                .proc_handler   = proc_dointvec,
+                .mode           = 0644,
+                .proc_handler   = proc_sctp_do_alpha_beta,
+                .extra1         = &rto_alpha_min,
+                .extra2         = &rto_alpha_max,
         },
         {
                 .procname       = "rto_beta_exp_divisor",
                 .data           = &init_net.sctp.rto_beta,
                 .maxlen         = sizeof(int),
-                .mode           = 0444,
-                .proc_handler   = proc_dointvec,
+                .mode           = 0644,
+                .proc_handler   = proc_sctp_do_alpha_beta,
+                .extra1         = &rto_beta_min,
+                .extra2         = &rto_beta_max,
         },
         {
                 .procname       = "max_burst",
@@ -403,6 +417,16 @@ static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
         return ret;
 }
 
+static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
+                                   void __user *buffer, size_t *lenp,
+                                   loff_t *ppos)
+{
+        pr_warn_once("Changing rto_alpha or rto_beta may lead to "
+                     "suboptimal rtt/srtt estimations!\n");
+
+        return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
+}
+
 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
                              void __user *buffer, size_t *lenp,
                              loff_t *ppos)