xen-blkfront: switch to using blk_queue_write_cache()

[cascardo/linux.git] / net / ipv4 / udp.c

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 95d2f19..08eed5e 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -356,8 +356,8 @@ EXPORT_SYMBOL(udp_lib_get_port);
  * match_wildcard == false: addresses must be exactly the same, i.e.
  *                          0.0.0.0 only equals to 0.0.0.0
  */
-static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2,
-                               bool match_wildcard)
+int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2,
+                        bool match_wildcard)
 {
        struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
 
@@ -848,32 +848,20 @@ void udp_set_csum(bool nocheck, struct sk_buff *skb,
 {
        struct udphdr *uh = udp_hdr(skb);
 
-       if (nocheck)
+       if (nocheck) {
                uh->check = 0;
-       else if (skb_is_gso(skb))
+       } else if (skb_is_gso(skb)) {
                uh->check = ~udp_v4_check(len, saddr, daddr, 0);
-       else if (skb_dst(skb) && skb_dst(skb)->dev &&
-                (skb_dst(skb)->dev->features &
-                 (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM))) {
-
-               BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
-
+       } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+               uh->check = 0;
+               uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb));
+               if (uh->check == 0)
+                       uh->check = CSUM_MANGLED_0;
+       } else {
                skb->ip_summed = CHECKSUM_PARTIAL;
                skb->csum_start = skb_transport_header(skb) - skb->head;
                skb->csum_offset = offsetof(struct udphdr, check);
                uh->check = ~udp_v4_check(len, saddr, daddr, 0);
-       } else {
-               __wsum csum;
-
-               BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
-
-               uh->check = 0;
-               csum = skb_checksum(skb, 0, len, 0);
-               uh->check = udp_v4_check(len, saddr, daddr, csum);
-               if (uh->check == 0)
-                       uh->check = CSUM_MANGLED_0;
-
-               skb->ip_summed = CHECKSUM_UNNECESSARY;
        }
 }
 EXPORT_SYMBOL(udp_set_csum);
@@ -2082,10 +2070,14 @@ void udp_v4_early_demux(struct sk_buff *skb)
                if (!in_dev)
                        return;
 
-               ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
-                                      iph->protocol);
-               if (!ours)
-                       return;
+               /* we are supposed to accept bcast packets */
+               if (skb->pkt_type == PACKET_MULTICAST) {
+                       ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
+                                              iph->protocol);
+                       if (!ours)
+                               return;
+               }
+
                sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
                                                   uh->source, iph->saddr, dif);
        } else if (skb->pkt_type == PACKET_HOST) {