1 files changed, 17 insertions, 6 deletions

diff --git a/net/sctp/output.c b/net/sctp/output.c
index 7d08f522ec84..b76411444515 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -405,13 +405,14 @@ int sctp_packet_transmit(struct sctp_packet *packet)
                         sctp_assoc_sync_pmtu(asoc);
                 }
         }
-        nskb->dst = dst_clone(tp->dst);
-        if (!nskb->dst)
+        dst = dst_clone(tp->dst);
+        skb_dst_set(nskb, dst);
+        if (dst)
                 goto no_route;
-        dst = nskb->dst;
 
         /* Build the SCTP header.  */
         sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
+        skb_reset_transport_header(nskb);
         sh->source = htons(packet->source_port);
         sh->dest   = htons(packet->destination_port);
 
@@ -527,15 +528,25 @@ int sctp_packet_transmit(struct sctp_packet *packet)
          * Note: Adler-32 is no longer applicable, as has been replaced
          * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
          */
-        if (!sctp_checksum_disable && !(dst->dev->features & NETIF_F_NO_CSUM)) {
+        if (!sctp_checksum_disable &&
+            !(dst->dev->features & (NETIF_F_NO_CSUM | NETIF_F_SCTP_CSUM))) {
                 __u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
 
                 /* 3) Put the resultant value into the checksum field in the
                  *    common header, and leave the rest of the bits unchanged.
                  */
                 sh->checksum = sctp_end_cksum(crc32);
-        } else
-                nskb->ip_summed = CHECKSUM_UNNECESSARY;
+        } else {
+                if (dst->dev->features & NETIF_F_SCTP_CSUM) {
+                        /* no need to seed psuedo checksum for SCTP */
+                        nskb->ip_summed = CHECKSUM_PARTIAL;
+                        nskb->csum_start = (skb_transport_header(nskb) -
+                                            nskb->head);
+                        nskb->csum_offset = offsetof(struct sctphdr, checksum);
+                } else {
+                        nskb->ip_summed = CHECKSUM_UNNECESSARY;
+                }
+        }
 
         /* IP layer ECN support
          * From RFC 2481